A DC charging system, method and device with a topological structure

Abstract

The present application provides a topological DC pile charging system, method and device, including: at least two DC pile charging devices in a topological structure loop, wherein each DC pile charging device includes: a power module, a power distribution unit PDU connected to the power module, a first contactor and a second contactor respectively connected to the first PDU in the PDU, and a controller; the controller is used to query and obtain the status of other DC pile charging devices in the topological structure loop when it is detected that the power required by the vehicle to be charged is greater than the maximum output power of the DC pile charging device, and determine one or more DC pile charging devices from the DC pile charging devices in the idle state as the DC pile charging devices to be borrowed; and is also used to control the closure of the contactors related to the DC pile charging devices to be borrowed. The problem of high-power charging vehicles relying on custom-built split-pole charging piles in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of energy technology, and in particular to a DC charging pile system, method and device with a topological structure. Background Art

[0002] In recent years, the number of new energy vehicles has continued to grow, and electric vehicle charging piles have become an important supporting infrastructure for electric vehicles. As people continue to pursue the endurance of electric vehicles, the power required by electric vehicle batteries is increasing, and the power required by the car is greater than the maximum output power of the charging pile, making it impossible to charge high-power electric vehicles.

[0003] Although the existing technology can solve the problem of high-power car charging by customizing and developing split-type charging piles that can output high power, the customization of such split-type charging piles increases the R&D and manufacturing costs, the customized resources cannot be reused, and a large amount of land resources are occupied. Summary of the invention

[0004] The present application provides a DC charging pile system, method and device with a topological structure, which are used to solve the problem that existing charging piles cannot achieve high-power charging while reducing manufacturing costs and land resource occupancy.

[0005] In a first aspect, the present application provides a DC pile charging system with a topological structure, comprising: at least two DC pile charging devices in the topological structure loop, wherein each of the DC pile charging devices comprises: a power module, a power distribution unit PDU connected to the power module, a first contactor and a second contactor respectively connected to a first PDU in the PDU, and a controller.

[0006] The controller is used to query and obtain the status of other DC pile charging devices in the topological structure loop when it is detected that the power required by the vehicle to be charged is greater than the maximum output power of the DC pile charging device, and determine one or more DC pile charging devices from the DC pile charging devices in the idle state as the DC pile charging devices to be borrowed.

[0007] The controller is also used to control the closure of the contactors related to the DC pile charging device to be borrowed, and send a closure request through the loop between the DC pile charging device to be borrowed, so that all related contactors on the loop are closed, so as to enable the DC pile charging device to borrow the idle charging pile power on the DC pile charging device to be borrowed.

[0008] In a specific implementation, the DC pile charging devices in the DC pile charging system are sequentially connected to form a ring topology structure loop.

[0009] Wherein, each of the DC pole charging devices is connected to two adjacent DC pole charging devices on the ring topology structure loop through the first contactor and the second contactor in the DC pole charging device.

[0010] In a specific implementation, the DC pile charging devices in the DC pile charging system are connected via a star common point to form a star topology loop.

[0011] Wherein, for each of the DC pile charging devices, the first contactor and the second contactor in the DC pile charging device are connected to the star common point.

[0012] In a specific implementation, the DC pole charging system includes a first DC pole charging subsystem and a second DC pole charging subsystem.

[0013] The DC pile charging devices in the first DC pile charging subsystem are connected in sequence to form a ring topology structure loop; wherein, for each of the DC pile charging devices in the first DC pile charging subsystem, the first contactor and the second contactor in the DC pile charging device are connected to two adjacent DC pile charging devices on the ring topology structure loop.

[0014] The DC pile charging devices in the second DC pile charging subsystem are connected through a star common point to form a star topology structure loop; wherein, for each of the DC pile charging devices in the second DC pile charging subsystem, the first contactor and the second contactor in the DC pile charging device are connected to the star common point.

[0015] A first contactor or a second contactor of a DC pile charging device in the first DC pile charging subsystem is connected to the star common point.

[0016] In a specific implementation, the first contactor and the second contactor are high-voltage DC contactors.

[0017] In a specific implementation, for each of the DC pole charging devices, the controller of the DC pole charging device exchanges signals with the controllers of other DC pole charging devices via the transmission control protocol TCP or the controller area network CAN.

[0018] In a second aspect, the present application provides a charging method for a DC pile charging system based on a topological structure, comprising:

[0019] When the controller of the DC pile charging device detects that the power required by the vehicle to be charged is greater than the maximum output power of the DC pile charging device, it queries and obtains the status of other DC pile charging devices in the topological structure loop, and determines one or more DC pile charging devices from the DC pile charging devices in the idle state as the DC pile charging devices to be borrowed.

[0020] The controller of the DC pile charging device controls the contactor related to the DC pile charging device to be borrowed to close, and sends a closing request through the loop between the DC pile charging device to be borrowed, so that all related contactors on the loop are closed, so that the DC pile charging device can borrow the idle charging pile power on the DC pile charging device to be borrowed.

[0021] In a specific embodiment, it also includes:

[0022] The controller of the DC pile charging device receives a closing request sent by other DC pile charging devices on the loop, and according to the closing request, determines a contactor to be closed from the first contactor and the second contactor, and closes the contactor to be closed.

[0023] In a third aspect, the present application provides a DC pole charging device of a topological structure, comprising: a power module, a power distribution unit PDU connected to the power module, a first contactor and a second contactor respectively connected to a first PDU in the PDU, and a controller;

[0024] The controller is used to query and obtain the status of other DC pile charging devices in the DC pile charging system of the topological structure when it is detected that the power required by the vehicle to be charged is greater than the maximum output power of the DC pile charging device, and determine one or more DC pile charging devices from the DC pile charging devices in the idle state as the DC pile charging devices to be borrowed;

[0025] The controller is also used to control the closure of the contactors related to the DC pile charging device to be borrowed, and send a closure request through the loop between the DC pile charging device to be borrowed, so that all related contactors on the loop are closed, so as to enable the DC pile charging device to borrow the idle charging pile power on the DC pile charging device to be borrowed.

[0026] The present application provides a DC pile charging system, method and device of a topological structure, through at least two DC pile charging devices in the topological structure loop, wherein each of the DC pile charging devices includes: a power module, a power distribution unit PDU connected to the power module, a first contactor and a second contactor respectively connected to a first PDU in the PDU, and a controller; the controller is used to query and obtain the status of other DC pile charging devices in the topological structure loop when it is detected that the power required by the vehicle to be charged is greater than the maximum output power of the DC pile charging device, and determine one or more DC pile charging devices from the DC pile charging devices in an idle state as the DC pile charging devices to be borrowed; the controller is also used to control the contactors related to the DC pile charging devices to be borrowed to close, and send a closing request through the loop between the DC pile charging devices to be borrowed, so that the related contactors on the loop are all closed, so as to enable the DC pile charging device to borrow the idle charging pile power on the DC pile charging device to be borrowed. Compared with the existing technology of custom-building split charging piles to meet the charging needs of high-power charging vehicles, the present application realizes the charging effect by making the DC pile charging device form a topological structure loop to form a topological DC pile charging system, effectively utilizes existing resources, reduces R&D and manufacturing costs, and is easy to maintain and expand functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 A schematic diagram of the structure of a DC charging pile system with a ring topology provided in the second embodiment of the present application;

[0029] Figure 2 A schematic diagram of the structure of a DC charging pile system with a star topology structure provided in the third embodiment of the present application;

[0030] Figure 3 A schematic diagram of the structure of a DC charging pile system with a hybrid topology structure provided in the fourth embodiment of the present application;

[0031] Figure 4 A schematic diagram of the structure of a DC charging device provided in Embodiment 5 of the present application;

[0032] Figure 5 A flowchart of a charging method for a DC charging pile system with a topology structure provided in Example 6 of the present application.

[0033] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments made by ordinary technicians in this field under the enlightenment of the embodiments belong to the scope of protection of the present application.

[0035] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] First, the terms involved in this application are explained:

[0037] DC charging pile: The input voltage uses three-phase four-wire AC power, and the output is adjustable DC power. The output voltage and current adjustment range are large, and the charging speed is fast.

[0038] Split charging pile: a high-power charging pile.

[0039] As the endurance of electric vehicles increases, the power required by electric vehicle batteries increases day by day, while the maximum output power of ordinary DC charging piles is lower than the power required by high-power electric vehicles. In the prior art, the charging needs of high-power electric vehicles are met by customizing and building high-power split-pole charging piles, but there are problems such as the inability to reuse customized resources and high R&D and manufacturing costs. In order to solve the above technical problems, the concept of this application is how to design a high-power charging pile system with low manufacturing cost to meet the charging needs of high-power electric vehicles.

[0040] The technical solution of the present application is described in detail below through specific embodiments. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0041] A DC pile charging system with a topological structure provided in a first embodiment of the present application includes: at least two DC pile charging devices in a topological structure loop, wherein each DC pile charging device includes: a power module, a power distribution unit PDU connected to the power module, a first contactor and a second contactor respectively connected to a first PDU in the PDU, and a controller.

[0042] In this embodiment, the connection between the DC pile charging devices is that the positive high voltage is connected end to end, and the negative high voltage is connected end to end.

[0043] In addition, more specifically, the controller is used to query and obtain the status of other DC pile charging devices in the topological structure loop when it is detected that the power required by the vehicle to be charged is greater than the maximum output power of the DC pile charging device, and determine one or more DC pile charging devices from the DC pile charging devices in the idle state as the DC pile charging devices to be borrowed. The controller is also used to control the contactor related to the DC pile charging device to be borrowed to close, and send a closing request through the loop between the DC pile charging device to be borrowed, so that the related contactors on the loop are all closed, so as to enable the DC pile charging device to borrow the idle charging pile power on the DC pile charging device to be borrowed.

[0044] In this embodiment, the controller queries and obtains the status of other DC pile charging devices in the topological structure loop mainly by confirming whether the charging gun is connected to the charging port, thereby being able to further determine which of the other DC pile charging devices in the loop are in an idle state.

[0045] Furthermore, for example, the controller can exchange signals with the controllers of other DC pile charging devices through the transmission control protocol TCP or the controller area network CAN, so as to obtain the status of other DC pile charging devices, and receive or send closing requests, etc.

[0046] In this embodiment, by constructing a DC pile charging system of a topological structure, the DC pile charging system of a specific topological structure includes at least two DC pile charging devices in a topological structure loop, wherein each DC pile charging device includes: a power module, a power distribution unit PDU connected to the power module, a first contactor and a second contactor respectively connected to a first PDU in the PDU, and a controller; the controller is used to query and obtain the status of other DC pile charging devices in the topological structure loop when it is detected that the power required by the vehicle to be charged is greater than the maximum output power of the DC pile charging device, and determine one or more DC pile charging devices from the DC pile charging devices in the idle state as the DC pile charging devices to be borrowed; the controller is also used to control the contactors related to the DC pile charging devices to be borrowed to close, and send a closing request through the loop between the DC pile charging devices to be borrowed, so that the related contactors on the loop are all closed, so as to realize that the DC pile charging device borrows the idle charging pile power on the DC pile charging device to be borrowed. Compared with the prior art that meets the charging needs of high-power electric vehicles by customizing and building high-power split charging piles, the present application transforms the DC pile charging device so that multiple DC pile charging devices form a loop. When the maximum output power of the DC pile charging device is lower than the power required by the electric vehicle, the controller queries the idle DC pile charging device in the loop and closes the relevant contactors to achieve high-power charging and achieve the charging effect, avoiding customized design, realizing resource reuse, and reducing R&D and production costs. The DC pile charging system with a topological structure is suitable for various site installation scenarios, easy to maintain, and easy to expand subsequent functions. For example, the DC pile charging system with a topological structure can be used for charging devices in battery swapping systems and energy storage systems.

[0047] Figure 1 A schematic diagram of a DC charging system structure with a ring topology is provided in the second embodiment of the present application, as shown in FIG. Figure 1 As shown, the DC pile charging system 10 of the ring topology structure includes six DC pile charging devices 11; wherein each DC pile charging device 11 includes: a power module (not shown), a power distribution unit PDU (not shown) connected to the power module, a first contactor 12 and a second contactor 13 connected to a first PDU (not shown) among the PDUs, and a controller (not shown).

[0048] More specifically, the DC charging pole devices 11 in the DC charging pole system 10 of the ring topology structure are connected in sequence to form a ring topology structure loop. Based on this, for each DC charging pole device, the first contactor 12 and the second contactor 13 in the DC charging pole device 11 are connected to two adjacent DC charging pole devices 11 on the ring topology structure loop.

[0049] In addition, for example, the first contactor 12 and the second contactor 13 may be high-voltage DC contactors.

[0050] In this embodiment, when a DC pile charging device in the system is connected to a vehicle to be charged, the controller of the DC pile charging device detects that the maximum output power of the DC pile charging device is lower than the power required by the vehicle to be charged, and can query and obtain the status of other DC pile charging devices in the ring topology loop, and determine one or more DC pile charging devices from the DC pile charging devices in the idle state as DC pile charging devices to be borrowed.

[0051] For example, if Figure 1 As shown, when the vehicle to be charged is connected to Figure 1 When the DC pile charging device in the upper left corner (referred to as the first DC pile charging device) is shown, and the controller of the DC pile charging device determines that the DC pile charging device to be borrowed is the DC pile charging device shown in the upper right corner (referred to as the second DC pile charging device), the controller of the first DC pile charging device, in addition to closing the second contactor 13 of the controller itself, also needs to send a closing request to the loop between the second DC pile charging device and the second DC pile charging device through the transmission control protocol TCP or the controller area network CAN, so that the second DC pile charging device receiving the closing request closes the first contactor. At the same time, the third DC pile charging device in the loop also needs to close the first contactor 12 and the second contactor 13 according to the closing request, so that the first DC pile charging device borrows the idle charging pile power on the second DC pile charging device.

[0052] In this embodiment, if the DC pile charging system with a ring topology is composed of N DC pile charging devices (N≥2), it can provide charging services for (N / 2) vehicles at the same time.

[0053] In this embodiment, a DC pile charging device is connected to form a ring topology loop to form a DC pile charging system with a ring topology structure. Compared with the prior art of custom-building a high-power split charging pile, the present application uses a DC pile charging device to construct a DC pile charging system with a ring topology structure to achieve high-power charging and achieve a charging effect, which solves the charging problem of high-power electric vehicles, avoids customized design, realizes resource reuse, and reduces R&D and production costs. The DC pile charging system with a ring topology structure is suitable for various site installation scenarios, is easy to maintain, and is easy to expand subsequent functions. For example, the DC pile charging system with a ring topology structure can be used for charging devices in battery exchange systems and energy storage systems.

[0054] Figure 2 A schematic diagram of a DC charging system structure with a star topology structure is provided in the third embodiment of the present application, as shown in FIG. Figure 2As shown, the star topology DC pile charging system 20 includes three DC pile charging devices 11 and a star common point 21; wherein each DC pile charging device 11 includes: a power module (not shown), a power distribution unit PDU (not shown) connected to the power module, a first contactor 12 and a second contactor 13 connected to a first PDU (not shown) in the PDU, and a controller (not shown).

[0055] More specifically, the DC charging pole devices 11 in the DC charging pole system 20 with a star topology structure are connected through a star common point 21 to form a star topology structure loop. Based on this, for each DC charging pole device, the first contactor 12 and the second contactor 13 in the DC charging pole device 11 are connected to the star common point 21.

[0056] In addition, for example, the first contactor 12 and the second contactor 13 may be high-voltage DC contactors.

[0057] In this embodiment, the DC pile charging system with a star topology structure is composed of at least three DC pile charging devices.

[0058] In this embodiment, when a DC pile charging device in the system is connected to a vehicle to be charged, the controller of the DC pile charging device detects that the maximum output power of the DC pile charging device is lower than the power required by the vehicle to be charged, and can query and obtain the status of other DC pile charging devices in the star topology structure loop, and determine one or more DC pile charging devices from the DC pile charging devices in the idle state as DC pile charging devices to be borrowed.

[0059] For example, if Figure 2 As shown, when the vehicle to be charged is connected to Figure 2 When the DC pile charging device at the top (referred to as the fourth DC pile charging device) and the controller of the DC pile charging device determines that the DC pile charging device to be borrowed is the DC pile charging device shown at the bottom (referred to as the fifth DC pile charging device), the controller of the fourth DC pile charging device, in addition to closing the first contactor 12 and the second contactor 13 of the controller itself, also needs to send a closing request to the loop between the fifth DC pile charging device through the transmission control protocol TCP or the controller area network CAN, so that the fifth DC pile charging device that receives the closing request closes the first contactor 12 and the second contactor 13, thereby allowing the fourth DC pile charging device to borrow the idle charging pile power on the fifth DC pile charging device.

[0060] In this embodiment, if the DC charging pile system with a star topology is composed of N DC charging pile devices (N≥2), it can meet the charging needs of a vehicle, and the control is simple and the complexity is low.

[0061] In this embodiment, a star topology loop is formed by connecting the DC pile charging device to form a star topology DC pile charging system. Compared with the prior art of custom-developed and produced high-power split charging piles to meet the charging needs of high-power charging vehicles, this application uses a DC pile charging device to construct a star topology DC pile charging system to achieve high-power charging and charging effect, solves the charging problem of high-power electric vehicles, avoids customized research and development, realizes resource reuse, and reduces research and development and production costs. The star topology DC pile charging system is suitable for various site installation scenarios, is easier to maintain, and can achieve functional expansion. For example, the star topology DC pile charging system can be used for charging devices in battery exchange systems and energy storage systems.

[0062] Figure 3 A schematic diagram of a DC charging system structure of a hybrid topology structure provided in the fourth embodiment of the present application is shown in FIG. Figure 3 As shown, the DC pile charging system 30 of the hybrid topology structure includes a first DC pile charging subsystem 31 and a second DC pile charging subsystem 32, the first DC pile charging subsystem 31 includes six DC pile charging devices 11, the second DC pile charging subsystem 32 includes three DC pile charging devices 11, and a star common point 21; wherein each DC pile charging device 11 includes: a power module (not shown), a power distribution unit PDU (not shown) connected to the power module, a first contactor 12 and a second contactor 13 in the PDUs connected to the first PDU (not shown), and a controller (not shown).

[0063] More specifically, the first DC pile charging subsystem 31 and the second DC pile charging subsystem 32 in the DC pile charging system 30 of the hybrid topology structure are connected to form a hybrid topology structure loop. Based on this, each DC pile charging device in the first DC pile charging subsystem 31 is connected to two adjacent DC pile charging devices 11 on the ring topology structure loop through the first contactor 12 and the second contactor 13 in the DC pile charging device 11 to form a ring topology structure loop; each DC pile charging device in the second DC pile charging subsystem 32 is connected to the star common point 21 through the first contactor 12 and the second contactor 13 in the DC pile charging device 11 to form a star topology structure loop. The first contactor 12 or the second contactor 13 of a DC pile charging device 11 in the first DC pile charging subsystem 31 is connected to the star common point 21.

[0064] In addition, for example, the first contactor 12 and the second contactor 13 may be high-voltage DC contactors.

[0065] In this embodiment, when a DC pile charging device in the system is connected to a vehicle to be charged, the controller of the DC pile charging device detects that the maximum output power of the DC pile charging device is lower than the power required by the vehicle to be charged, and can query and obtain the status of other DC pile charging devices in the hybrid topology structure loop, and determine one or more DC pile charging devices from the DC pile charging devices in the idle state as DC pile charging devices to be borrowed.

[0066] For example, if Figure 3 As shown, when the vehicle to be charged is connected to Figure 3 When the DC pile charging device in the upper left corner of the first DC pile charging subsystem 31 (referred to as the sixth DC pile charging device) and the controller of the DC pile charging device determines that the DC pile charging device to be borrowed is the DC pile charging device at the bottom of the second DC pile charging subsystem 32 (referred to as the seventh DC pile charging device), the controller of the sixth DC pile charging device, in addition to closing the second contactor 13 of the controller itself, needs to send a closing request to the loop between the seventh DC pile charging device through the transmission control protocol TCP or the controller area network CAN, so that the seventh DC pile charging device receiving the closing request closes the first contactor 12 and the second contactor 13. At the same time, the eighth DC pile charging device in the loop also needs to close the first contactor 12 and the second contactor 13 according to the closing request, and connect the star common point 21 in the second DC pile charging subsystem 32 so that the sixth DC pile charging device borrows the idle charging pile power on the seventh DC pile charging device.

[0067] In this embodiment, the DC pile charging system with a hybrid topology structure can avoid the problem of low charging power, thereby improving the charging speed.

[0068] In this embodiment, a hybrid topology structure loop is formed by connecting a DC pile charging device to form a DC pile charging system with a hybrid topology structure. Compared with the prior art of custom-developed and produced high-power split charging piles to meet the charging needs of high-power charging vehicles, this application uses a DC pile charging device to construct a DC pile charging system with a hybrid topology structure to achieve high-power charging, which solves the charging problem of high-power electric vehicles, avoids customized development, realizes resource reuse, and reduces development and production costs. The DC pile charging system with a hybrid topology structure is suitable for various site installation scenarios, is easy to maintain, and can achieve functional expansion. For example, a DC pile charging system with a star topology structure can be used for charging devices in battery exchange systems and energy storage systems.

[0069] Figure 4 The schematic diagram of the structure of a DC pole charging device provided in the fifth embodiment of the present application is a DC pole charging device, which can be a DC pole charging device of a DC pole charging system of any of the above topological structures. Specifically, Figure 4 As shown, the DC pile charging device 11 includes: a power module 41, a power distribution unit PDU42 connected to the power module, a first contactor 12 and a second contactor 13 respectively connected to the first PDU421 in the PDU, and a controller 43.

[0070] The power module 41 is used to convert the AC power input into the DC power required by the electric vehicle battery. The power distribution unit PDU42 is a power distribution socket for power distribution. The first contactor 12 and the second contactor 13 can be high-voltage DC contactors.

[0071] In addition, the controller 43 is used to query and obtain the status of other DC pile charging devices in the topological structure loop when it is detected that the power required by the vehicle to be charged is greater than the maximum output power of the DC pile charging device, confirm whether the DC pile charging device is in an idle state by whether the charging gun is connected to the charging port, and determine one or more DC pile charging devices from the DC pile charging devices in the idle state as the DC pile charging devices to be borrowed, and then control the contactors related to the DC pile charging devices to be borrowed to close, and send a closing request through the loop between the DC pile charging devices to be borrowed, so that the related contactors on the loop are all closed, so as to enable the DC pile charging device to borrow the idle charging pile power on the DC pile charging device to be borrowed.

[0072] In this embodiment, a DC charging pile is modified based on the structure of the existing DC charging pile, and a PDU, a first contactor 12, a second contactor 13 and a controller 43 are added to form a DC charging pile device. Compared with the DC charging pile and the split charging pile with high power output in the prior art, the DC charging pile device of the present application can be connected with other DC charging pile devices through the first contactor 12 and the second contactor 13 to form a DC charging pile system with a topological structure. The controller 43 detects the relationship between the power required by the vehicle to be charged and the maximum output power of the DC charging pile device. When the maximum output power of the DC charging pile device is less than the power required by the vehicle, the controller 43 queries and obtains the topological structure. The state of other DC pile charging devices in the structure loop is determined, and one or more DC pile charging devices are determined from the DC pile charging devices in the idle state as the DC pile charging devices to be borrowed, the contactors related to the DC pile charging devices to be borrowed are controlled to close, and a closing request is sent through the loop between the DC pile charging devices to be borrowed, so that all related contactors on the loop are closed, so that the DC pile charging device borrows the idle charging pile power on the DC pile charging device to be borrowed, and optimizes the power distribution of multiple DC pile charging devices to achieve the charging effect. On the other hand, resource reuse reduces related R&D and production costs, and is easy to maintain and expand functions.

[0073] Figure 5A schematic flow chart of a charging method for a DC charging pile system with a topological structure provided in Embodiment 6 of the present application, wherein the DC charging pile system with a topological structure may be the system shown in the above embodiment, specifically, as shown in FIG. Figure 5 As shown, the charging method of the DC pile charging system with topological structure specifically includes the following steps:

[0074] Step S501: When the controller of the DC pile charging device detects that the power required by the vehicle to be charged is greater than the maximum output power of the DC pile charging device, it queries and obtains the status of other DC pile charging devices in the topological structure loop, and determines one or more DC pile charging devices from the DC pile charging devices in the idle state as the DC pile charging devices to be borrowed.

[0075] In this embodiment, the controller confirms that the DC pile charging device is in an idle state by the fact that the charging gun is not connected to the charging port, and the topology structure loop can be a ring topology structure loop, a star topology structure loop, and a hybrid topology structure loop.

[0076] Step S502: The controller of the DC pile charging device controls the contactor related to the DC pile charging device to be borrowed to close, and sends a closing request through the loop between the DC pile charging device to be borrowed, so that all related contactors on the loop are closed, so that the DC pile charging device can borrow the idle charging pile power on the DC pile charging device to be borrowed.

[0077] In this embodiment, the contactor may be a high-voltage direct current contactor.

[0078] Step S503: the controller of the DC pile charging device receives a closing request sent by other DC pile charging devices in the loop, and determines a contactor to be closed from the first contactor and the second contactor according to the closing request, and closes the contactor to be closed.

[0079] In this embodiment, the controller of the DC charging pile device exchanges signals with the controllers of other DC charging pile devices via the transmission control protocol TCP or the controller area network CAN.

[0080] In this embodiment, the DC pile charging device is connected to form a ring topology loop, a star topology loop, and a hybrid topology loop. When the internal controller of the DC pile charging device detects that the maximum output power of the DC pile charging device is less than the power required by the charging vehicle, it searches for the idle DC pile charging device in the loop and closes all contactors between them to achieve the power of the idle DC pile charging device in the DC pile charging system with borrowed topology. Compared with the custom-built split charging pile with high power in the prior art, this application can achieve the charging effect without customized research and development, reduce research and development and production costs, realize resource reuse, and is suitable for various site installation scenarios, easy to maintain and expand functions.

[0081] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0082] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A DC charging pile system with a topological structure, characterized in that: include: At least two DC pole charging devices on the topological structure loop, wherein each of the DC pole charging devices comprises: a power module, a power distribution unit PDU connected to the power module, a first contactor and a second contactor respectively connected to a first PDU in the PDU, and a controller; The controller is used to query and obtain the status of other DC pile charging devices in the topological structure loop when it is detected that the power required by the vehicle to be charged is greater than the maximum output power of the DC pile charging device, and determine one or more DC pile charging devices from the DC pile charging devices in the idle state as the DC pile charging devices to be borrowed; The controller is also used to control the closure of the contactors related to the DC pile charging device to be borrowed, and send a closure request through the loop between the DC pile charging device to be borrowed, so that all related contactors on the loop are closed, so as to enable the DC pile charging device to borrow the idle charging pile power on the DC pile charging device to be borrowed.

2. The DC charging system with topological structure according to claim 1 is characterized in that: The DC pile charging devices in the DC pile charging system are connected in sequence to form a ring topology structure loop; Wherein, each of the DC pole charging devices is connected to two adjacent DC pole charging devices on the ring topology structure loop through the first contactor and the second contactor in the DC pole charging device.

3. The DC charging system with topological structure according to claim 1 is characterized in that: The DC pile charging devices in the DC pile charging system are connected via a star common point to form a star topology structure loop; Wherein, for each of the DC pile charging devices, the first contactor and the second contactor in the DC pile charging device are connected to the star common point.

4. The DC charging system with topological structure according to claim 1 is characterized in that: The DC pile charging system includes a first DC pile charging subsystem and a second DC pile charging subsystem; The DC pile charging devices in the first DC pile charging subsystem are connected in sequence to form a ring topology structure loop; wherein, for each of the DC pile charging devices in the first DC pile charging subsystem, the first contactor and the second contactor in the DC pile charging device are connected to two adjacent DC pile charging devices on the ring topology structure loop; The DC pile charging devices in the second DC pile charging subsystem are connected through a star common point to form a star topology loop; wherein, for each of the DC pile charging devices in the second DC pile charging subsystem, the first contactor and the second contactor in the DC pile charging device are connected to the star common point; A first contactor or a second contactor of a DC pile charging device in the first DC pile charging subsystem is connected to the star common point.

5. The DC charging system with topological structure according to any one of claims 1 to 4, characterized in that: The first contactor and the second contactor are high-voltage DC contactors.

6. The DC charging system with topological structure according to any one of claims 1 to 4, characterized in that: For each of the DC pile charging devices, the controller of the DC pile charging device exchanges signals with the controllers of other DC pile charging devices via the transmission control protocol TCP or the controller area network CAN.

7. A charging method for a DC charging system based on the topological structure of any one of claims 1 to 6, characterized in that: include: When the controller of the DC pile charging device detects that the power required by the vehicle to be charged is greater than the maximum output power of the DC pile charging device, it queries and obtains the status of other DC pile charging devices in the topological structure loop, and determines one or more DC pile charging devices from the DC pile charging devices in the idle state as the DC pile charging devices to be borrowed; The controller of the DC pile charging device controls the contactor related to the DC pile charging device to be borrowed to close, and sends a closing request through the loop between the DC pile charging device to be borrowed, so that all related contactors on the loop are closed, so that the DC pile charging device can borrow the idle charging pile power on the DC pile charging device to be borrowed.

8. The charging method according to claim 7, characterized in that: Also includes: The controller of the DC pile charging device receives a closing request sent by other DC pile charging devices on the loop, and according to the closing request, determines a contactor to be closed from the first contactor and the second contactor, and closes the contactor to be closed.

9. A DC charging device, characterized in that: include: A power module, a power distribution unit PDU connected to the power module, a first contactor and a second contactor respectively connected to a first PDU in the PDUs, and a controller; The controller is used to query and obtain the status of other DC pile charging devices in the DC pile charging system of the topological structure when it is detected that the power required by the vehicle to be charged is greater than the maximum output power of the DC pile charging device, and determine one or more DC pile charging devices from the DC pile charging devices in the idle state as the DC pile charging devices to be borrowed; The controller is also used to control the closure of the contactors related to the DC pile charging device to be borrowed, and send a closure request through the loop between the DC pile charging device to be borrowed, so that all related contactors on the loop are closed, so as to enable the DC pile charging device to borrow the idle charging pile power on the DC pile charging device to be borrowed.

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