CN117261652A

CN117261652A - Direct current fills electric pile

Info

Publication number: CN117261652A
Application number: CN202311559539.6A
Authority: CN
Inventors: 夏大叶; 肖豪; 肖林松; 陈谦; 李宏文; 李峻; 蒋鑫伟; 陈圆
Original assignee: Willfar Information Technology Co Ltd
Current assignee: Willfar Information Technology Co Ltd
Priority date: 2023-11-22
Filing date: 2023-11-22
Publication date: 2023-12-22
Anticipated expiration: 2043-11-22
Also published as: CN117261652B

Abstract

The invention provides a direct-current charging pile, which relates to the field of charging matching of new energy automobiles, and aims to improve a cable system into a form of one-end input and multi-end output so as to meet the basic structural requirement of one-to-many charging of the direct-current charging pile; the central control module is arranged in the cable system, the power supply parameters of the direct-current charging pile and the charging parameters of a plurality of vehicles to be charged are obtained through the communication form between the vehicles to be charged of the intervening charging host, the optimal charging scheme capable of adapting to the charging of the vehicles to be charged is obtained by combining the topological structure of the cable system, the charging host is assigned with proper output voltage and the most proper distributed charging power is assigned to each vehicle to be charged, then the distributed charging power information is sent to the corresponding vehicle to be charged and the output voltage is sent to the charging host by utilizing different ways, and the vehicles to be charged can adjust the charging load of the vehicles to be charged according to the vehicles to be charged, so that the waste of charging pile resources is avoided.

Description

Direct current fills electric pile

Technical Field

The invention relates to the field of charging matching of new energy automobiles, in particular to a direct current charging pile.

Background

The energy supplementing of the electric car depends on a charging pile, an alternating-current charging pile is generally adopted in a household charging environment, the charging voltage of the alternating-current charging pile is 220V or 380V, and the charging power is generally not more than 10 kilowatts; the public charging phantom generally adopts a direct current charging pile, and the charging voltage of the current direct current charging pile can reach more than 1200V and the charging power can reach more than 120 kilowatts because the current direct current charging pile is not limited by a household power distribution grid.

In the charging process, the charging pile and the trolley are always kept in information interaction so as to ensure the safety and reliability of charging; specifically, the information interaction content between the charging pile and the electric vehicle mainly includes content for establishing the outputtable voltage, outputtable power, required charging voltage of the electric vehicle, required charging power of the electric vehicle and the like of the charging pile. Correspondingly, in consideration of communication requirements, the charging mode of the charging pile for the electric car is a pile-car mode, namely, one charging pile can simultaneously charge corresponding to one electric car at most.

However, in practical application, since the current scale expansion speed of the charging pile is far lower than the increase speed of the electric vehicle stock, the charging form of one pile and one vehicle is partially insufficient in practical application.

On the one hand, the charging technology of the electric car is fast in innovation speed, and the charging parameters of the new electric car and the old electric car are large in difference, so that the charging capacity of the electric car is not completely matched with the power supply capacity of the charging pile, and part of electric cars cannot use all the charging power of the charging pile when the charging pile is used for charging, so that the waste of the charging pile resources is caused.

On the other hand, considering the life problem of battery, the electric car can charge to the battery according to the charging curve that presets when charging, and the setting of charging curve makes the electric car produce real-time change in the charging power of charging cycle, when charging power is lower, also can waste some fills electric pile resources.

It follows that it is necessary to propose a related solution in order to avoid waste of the charging pile resources.

Disclosure of Invention

The invention provides a direct-current charging pile, which is characterized in that a cable system is transformed into a form of one-end input and multi-end output, so that the basic structure requirement of one-to-many charging of the direct-current charging pile can be met; the central control module is arranged in the cable system, the power supply parameters of the direct-current charging piles and the charging parameters of the plurality of vehicles to be charged are obtained through the communication form among the vehicles to be charged of the intervening charging host, the optimal charging scheme capable of being matched with the plurality of vehicles to be charged is obtained by combining the topological structure of the cable system, proper output voltage is designated for the charging host, the most proper distribution charging power is designated for each vehicle to be charged, then the distribution charging power information is sent to the corresponding vehicle to be charged and the output voltage is sent to the charging host by utilizing different ways, the vehicle to be charged can adjust the charging load of the vehicle to be charged according to the vehicle to be charged, and under the influence of the topological structure of the cable system, the vehicle to be charged occupies different output power consumption of the charging host correspondingly, so that the function of dynamically adjusting charging of one pile and multiple vehicles is realized, and the waste of charging pile resources is avoided.

Specifically, the invention provides a direct-current charging pile, which comprises a charging host and a cable system;

the cable system comprises a first end and N second ends, wherein a corresponding power branch and a corresponding signal branch are respectively formed between each second end and the first end, each power branch comprises a power multiplexing section close to the first end and a power non-multiplexing section far away from the first end, and each signal branch comprises a signal multiplexing section close to the first end and a signal non-multiplexing section far away from the first end;

based on the corresponding signal branch, the charging host is used for respectively carrying out bidirectional communication with N vehicles to be charged and then charging each vehicle to be charged through the corresponding power branch;

the cable system further comprises a central control module, wherein the central control module is used for acquiring bidirectional communication information between the corresponding vehicle to be charged and the charging host from each signal non-multiplexing section;

the charging host is used for respectively carrying out two-way communication with N vehicles to be charged, and then charging each vehicle to be charged through a corresponding power branch circuit comprises the following steps:

Based on a preset program, the central control module is further used for confirming the output voltage of the charging host and the distributed charging power of each vehicle to be charged through the topological structure of the cable system and all the two-way communication information;

based on a preset vehicle communication mode, the central control module is further used for sending the distributed charging power information of each vehicle to be charged to the corresponding vehicle to be charged, and each piece of distributed charging power information is used for driving the corresponding vehicle to be charged to adjust the charging program of the vehicle to be charged;

based on a preset host communication mode, the central control module is further used for sending the output voltage to the charging host, and the output voltage is used for driving the charging host to adjust self discharge voltage;

according to the discharging voltage, each vehicle to be charged is charged by corresponding distributed charging power under the control of a corresponding charging program;

wherein N is an integer greater than 1.

In an optional embodiment, the obtaining, by the central control module, bidirectional communication information between the corresponding vehicle to be charged and the charging host from each signal non-multiplexing segment includes:

the central control module is used for sequentially acquiring bidirectional communication information between the corresponding vehicle to be charged and the charging host from each signal non-multiplexing section;

Or the central control module is used for obtaining the bidirectional communication information of each vehicle to be charged and the charging host from the corresponding signal non-multiplexing section in batches from all the vehicles to be charged.

In an alternative embodiment, the central control module comprises a control module and a far-field communication unit;

each control module is correspondingly connected with one far-field communication unit, and the far-field communication units are used for communicating the corresponding control modules with other control modules, and all the control modules form a communication local area network;

the central control module is used for acquiring bidirectional communication information between the corresponding vehicle to be charged and the charging host from each signal non-multiplexing section, and comprises the following steps:

each control module respectively intercepts bidirectional communication information between a corresponding vehicle to be charged and the charging host;

the central control module is further configured to confirm, through the topology structure of the cable system and all the two-way communication information, an output voltage of the charging host and an allocated charging power of each vehicle to be charged, where the allocating charging power includes:

and summarizing all the two-way communication information through the communication local area network, and combining the topological structure of the cable system to confirm the output voltage of the charging host and the distributed charging power of each vehicle to be charged.

In an alternative embodiment, after all the control modules form a communication local area network, one of the control modules is selected as a central module;

and the central module gathers all the two-way communication information based on the communication local area network, and confirms the output voltage of the charging host and the distributed charging power of each vehicle to be charged by combining the topological structure of the cable system.

In an optional embodiment, the central control module is further configured to send the allocated charging power information of each vehicle to be charged to the corresponding vehicle to be charged, and includes:

each control module sends the distributed charging power to the corresponding vehicle to be charged through the corresponding signal branch.

In an optional embodiment, the central control module is further configured to send the output voltage to the charging host, and the central control module includes:

and one of the control modules sends the output voltage to the charging host through a corresponding signal branch.

In an optional embodiment, the central control module further includes a near field communication unit, each control module is correspondingly connected with one near field communication unit, and the control module communicates with the corresponding vehicle to be charged based on the corresponding near field communication unit;

the central control module is further configured to send the allocated charging power information of each vehicle to be charged to the corresponding vehicle to be charged, where the sending includes:

and the control module sends corresponding distributed charging power to the corresponding vehicle to be charged through the corresponding near field communication unit.

In an optional embodiment, the cable system includes N dc charging cables, two ends of each dc charging cable are respectively provided with a power transmission male head, and at least one power transmission female head is provided on the dc charging cable;

the charging host is provided with a base station mother head, and the vehicle to be charged is provided with a vehicle mother head;

the power transmission male head, the power transmission female head, the vehicle female head and the base station female head are designed based on the same interface design standard;

when a=1, the power transmission male head at one end of the a-th direct current charging cable is connected with the vehicle female head of the a-th vehicle to be charged in a matched manner, and the power transmission male head at the other end of the a-th direct current charging cable is connected with the base station female head in a matched manner;

When a >1, the power transmission male head on one end of the a-th direct current charging cable is connected with the vehicle female head of the a-th vehicle to be charged in a matched manner, the power transmission male head on the other end of the a-th direct current charging cable is connected to the power transmission female head of the b-th direct current charging cable, and each power transmission female head allows at most one power transmission male head to be connected, wherein 0< b < a;

where a=1, 2, … …, N.

In an alternative embodiment, the dc charging cable includes one main cable and two dc charging connectors;

the direct-current charging connector comprises a connector main body, a cable joint, one power transmission male head, one power transmission female head and one central control module;

based on the interface design standard, the cable connector comprises a main communication end and a main power end, the power transmission male head comprises a first communication end and a first power end, and the power transmission female head comprises a second communication end and a second power end; the first communication end and the second communication end are respectively connected with the main communication end in the connector main body, and the first power end and the second power end are respectively connected with the main power end;

the central control module is connected between the first communication end and the main communication end.

In summary, the invention provides the direct-current charging pile, which is characterized in that a cable system is transformed into a form of one-end input and multi-end output, so that the basic structure requirement of one-to-many charging of the direct-current charging pile can be met; the central control module is arranged in the cable system, the power supply parameters of the direct-current charging piles and the charging parameters of the plurality of vehicles to be charged are obtained through the communication form among the vehicles to be charged of the intervening charging host, the optimal charging scheme capable of being matched with the plurality of vehicles to be charged is obtained by combining the topological structure of the cable system, proper output voltage is designated for the charging host, the most proper distribution charging power is designated for each vehicle to be charged, then the distribution charging power information is sent to the corresponding vehicle to be charged and the output voltage is sent to the charging host by utilizing different ways, the vehicle to be charged can adjust the charging load of the vehicle to be charged according to the vehicle to be charged, and under the influence of the topological structure of the cable system, the vehicle to be charged occupies different output power consumption of the charging host correspondingly, so that the function of dynamically adjusting charging of one pile and multiple vehicles is realized, and the waste of charging pile resources is avoided.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic structural diagram of a dc charging pile according to an embodiment of the present invention.

Fig. 2 shows a schematic structural diagram of a central control module according to an embodiment of the invention.

Fig. 3 is a schematic structural diagram of a dc charging connector according to an embodiment of the present invention.

Fig. 4 shows a schematic structural diagram of a dc charging cable according to an embodiment of the present invention.

Fig. 5 shows a schematic block diagram of the structure of a dc charging cable according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of a charging host system according to an embodiment of the invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Fig. 1 shows a schematic structural diagram of a dc charging pile according to an embodiment of the present invention, wherein, in the schematic structure of a cable system, a broken line represents a signal branch, and a solid line represents a power branch.

The embodiment of the invention provides a direct-current charging pile, which comprises a charging host and a cable system;

the cable system comprises a first end and N second ends, wherein a corresponding power branch and a signal branch are respectively formed between each second end and the first end, each power branch comprises a power multiplexing section 91 close to the first end and a power non-multiplexing section 92 far away from the first end, and each signal branch comprises a signal multiplexing section 93 close to the first end and a signal non-multiplexing section 94 far away from the first end; specifically, a region where a certain branch and the rest of branches are substantially overlapped is called multiplexing, referring to the schematic diagram, the cable system is substantially a topology structure with multiple ends led out from one end, and according to actual requirements, the cable system can be specifically divided into a power transmission topology and a signal transmission topology, and correspondingly, in the power transmission topology, a multiplexing part and a non-multiplexing part exist in the power branch; similarly, in a signal transmission topology, there may be a multiplexed portion and a non-multiplexed portion of the signal branches.

Based on the corresponding signal branch, the charging host is used for respectively carrying out bidirectional communication with N vehicles to be charged and then charging each vehicle to be charged through the corresponding power branch; specifically, according to the general rule at present, based on safety and reliability, in the process of charging the electric car by the direct current charging pile, communication is required to be kept all the time, and the two are subjected to coordinated charging in a communication mode. In the embodiment of the present invention, the basic rule needs to be followed as well, and in particular, in the embodiment of the present invention, the cable system further includes a central control module, where the central control module is configured to obtain, from each signal non-multiplexing segment, bidirectional communication information between the corresponding vehicle to be charged and the charging host; specifically, the structure of the central control module for obtaining the bidirectional communication information can be directly connected to the signal non-multiplexing section in parallel or can be directly connected to the signal non-multiplexing section. In actual use, because the charging compatibility of the vehicles to be charged is different, partial special topological structure is small, and the connection between the vehicles to be charged and the charging host is possibly required to be disconnected temporarily, accordingly, the central control module can be also inserted into the on-off control of the power non-multiplexing section according to the requirements.

Correspondingly, after the charging host is used for respectively carrying out two-way communication with the N vehicles to be charged, each vehicle to be charged is charged through the corresponding power branch, and the charging comprises the following steps:

based on a preset program, the central control module is further used for confirming the output voltage of the charging host and the distributed charging power of each vehicle to be charged through the topological structure of the cable system and all the two-way communication information; the central control module is used as a master control, and according to the content of the two-way communication information, the power supply compatible information of the vehicle to be charged can be obtained, and the discharge compatible information of the charging host can be known; under a preset program, different charging powers are distributed for different vehicles to be charged by combining a topological structure according to the functions to be realized. Specifically, the function to be realized is mainly determined according to the position where the direct current charging pile is arranged, for example, if the direct current charging pile is arranged in a high-speed rest station, in order to improve the circulation speed of the vehicle, the power can be reduced after the local energy supplement is carried out on the single vehicle with high power, and the vehicle is ensured to drive away after the rapid energy supplement; if the direct current charging pile is arranged in the district parking lot, the charging power consumption of the vehicle to be charged, which is connected to the direct current charging pile, can be evenly distributed due to enough charging time.

Based on a preset vehicle communication mode, the central control module is further used for sending the distributed charging power information of each vehicle to be charged to the corresponding vehicle to be charged, and each piece of distributed charging power information is used for driving the corresponding vehicle to be charged to adjust the charging program of the vehicle to be charged; the distributed charging power information is understood as virtual information, and for the vehicle to be charged, the distributed charging power information corresponds to feedback information of the charging host, and the vehicle to be charged adjusts its charging program to a state adapted to the distributed charging power information under the guidance and limitation of the distributed charging power information.

and according to the discharging voltage, each vehicle to be charged is charged with corresponding distributed charging power under the control of a corresponding charging program.

Specifically, according to the related physical principle, the charging host has rated external discharge power, and when the charging host actually outputs, the charging host outputs voltage according to the requirement, and the actual discharge power of the charging host depends on the load; the vehicle can be compatible with different voltages according to different design platforms, generally has the highest voltage limit, and can carry out self-adjustment on charging load according to the information about external discharging power fed back by the charging host, so that the reliability and the safety of charging are ensured. In short, after the vehicle to be charged is connected to the charging host, the charging host is only responsible for controlling the output voltage, the vehicle to be charged is only responsible for adjusting the charging load of the vehicle to be charged, the actual charging power of the vehicle to be charged depends on the topological structure of the cable system, and the highest charging power of the vehicle to be charged depends on the rated external discharging power of the charging host. Therefore, in practical implementation, considering the implementation feasibility and compatibility, the vehicle itself and the charging pile itself cannot be subjected to a large hardware modification, so the improvement of the embodiment of the present invention mainly focuses on the cable system.

The specific modification modes comprise: firstly, in order to meet the requirement of physical connection, the end-to-end form of an input/output interface of the existing cable system is adjusted to be an end-to-end form, so that the structural requirement on a connection layer is met; correspondingly, the control module is added, so that the problem of information errors caused by line multiplexing can be coordinated, and the information of the charging host and the vehicle to be charged can be acquired by being interposed in the communication between the charging host and the vehicle to be charged, so that the charging arrangement is carried out on all the vehicles to be charged on the whole.

Further, the central control module is configured to obtain, from each signal non-multiplexing section, bidirectional communication information between the corresponding vehicle to be charged and the charging host, where the bidirectional communication information includes:

Specifically, the communication between the charging host and the vehicle to be charged needs to be performed one-to-one based on the relevant rule, and because the signal branches in the embodiment of the invention have multiplexing conditions, in order to avoid the problem of data disorder, preferably, the central control module can acquire the corresponding bidirectional communication information between the vehicle to be charged and the charging host from each signal non-multiplexing section in sequence.

Furthermore, as the central control module is connected to the communication between the charging host and the vehicle to be charged, the central control module can completely intervene in the information interaction condition between the charging host and the vehicle to be charged, when the charging host simultaneously communicates with a plurality of vehicles to be charged, the information is transmitted and received through the central control module, so that disorder among the information can be avoided, and the central control module can also be used for acquiring the bidirectional communication information of each vehicle to be charged and the charging host from the corresponding signal non-multiplexing sections in batches from all the vehicles to be charged.

Further, fig. 2 shows a schematic structural diagram of a central control module according to an embodiment of the present invention.

In the embodiment of the invention, the central control module comprises a control module and a far-field communication unit;

Specifically, several functions required to be implemented by the central control module in the embodiment of the present invention are respectively: acquiring bidirectional communication information of the signal branch, reasonably distributing charging power to each vehicle to be charged according to the topological structure of the cable system, the condition of the vehicle to be charged and the condition of the charging host, and setting the output voltage of the charging host; in order to realize the functions, in the embodiment of the invention, a control module is directly connected to the signal branch, the control module is networked through a remote communication unit, and all the control modules after networking form information communication with each other to realize the functions required to be realized by the central control module.

Further, after all the control modules form a communication local area network, one of the control modules is selected as a central module;

Specifically, in order to facilitate the operation of the central control module, one of the control modules is selected as a central module, which is favorable for summarizing and transmitting information.

Further, the central control module is further configured to send the allocated charging power information of each vehicle to be charged to the corresponding vehicle to be charged, where the sending includes: each control module sends the distributed charging power to the corresponding vehicle to be charged through the corresponding signal branch.

Specifically, for most vehicles to be charged, the central control module can transmit related information of distributed charging power to the vehicles to be charged through the signal branch; for the vehicle to be charged, the distributed charging power sent by the central control module is equivalent to the information sent by the charging host, namely the information of the distributed charging power is equivalent to the information to be manufactured, and the vehicle to be charged is subjected to adjustment of the charging power under the passive condition; this embodiment can be applied to most vehicles to be charged.

Further, the central control module is further configured to send the output voltage to the charging host, and includes:

and one of the control modules sends the output voltage to the charging host through a corresponding signal branch. Similarly, for the charging host, a control module is used to send the output voltage information to the charging host, and the charging host can also consider the information fed back by the vehicle to be charged, so that the charging host can passively regulate the output voltage.

Specifically, information is transmitted in a signal branch way, so that the compatibility problem of a charging host and a vehicle to be charged is essentially solved; for the stock charging host and the stock vehicle to be charged, both can be adapted to the cable system of the embodiment of the invention, namely the direct current charging pile structure of the embodiment of the invention is not limited to the newly built direct current charging pile, but also can be used for low-cost transformation of the stock direct current charging pile; meanwhile, the direct current charging pile disclosed by the embodiment of the invention can be well adopted by the vehicles to be charged.

Further, the central control module further comprises near field communication units, each control module is correspondingly connected with one near field communication unit, and the control module communicates with the corresponding vehicle to be charged based on the corresponding near field communication unit; the central control module is further configured to send the allocated charging power information of each vehicle to be charged to the corresponding vehicle to be charged, where the sending includes: and the control module sends corresponding distributed charging power to the corresponding vehicle to be charged through the corresponding near field communication unit.

In particular, the near field communication unit functions as a communication between the control module and the vehicle to be charged. Specifically, according to practical implementation conditions, when the connecting wire in the cable system is connected with the vehicle to be charged, the corresponding signal non-multiplexing section is close to the corresponding vehicle to be charged, so that by setting the near field communication unit (the setting position of the control module) on the corresponding signal non-multiplexing section, on one hand, the near field communication module can be ensured to be connected and communicated with the corresponding vehicle to be charged, and on the other hand, the near field communication module and the corresponding vehicle to be charged can be logically bound. In practical implementation, corresponding information about the distribution of charging power can also be transmitted to the corresponding vehicle to be charged through the near field communication module.

Fig. 3 shows a schematic structural diagram of a dc charging connector according to an embodiment of the present invention, fig. 4 shows a schematic structural diagram of a dc charging cable according to an embodiment of the present invention, and fig. 5 shows a schematic structural diagram of a dc charging cable according to an embodiment of the present invention.

Further, in the embodiment of the present invention, considering an actual application scenario, the cable system includes N dc charging cables, two ends of each dc charging cable are respectively provided with a power transmission male head, and at least one power transmission female head is provided on the dc charging cable;

where a=1, 2, … …, N.

Specifically, the cable system actually consists of a plurality of direct current charging cables, and the direct current charging cables can be provided by direct current charging piles on one hand and can be self-provided by a vehicle owner on the other hand in actual implementation. In practical application, the vehicle to be charged accesses a direct-current charging cable into the circuit topology as required; the topology of the cable system changes each time a vehicle to be charged is accessed.

Further, considering the implementation structure of the direct current charging cable, the direct current charging cable comprises one total cable and two direct current charging connectors 1;

the direct-current charging connector 1 comprises a connector main body, a cable joint, a power transmission male head, a power transmission female head and a central control module;

Correspondingly, based on the implementation structure of the direct current charging connector 1, a corresponding physical structure can be obtained based on the concept of the direct current charging pile described in the embodiment of the invention.

Specifically, referring to fig. 3, the present invention provides a dc charging connector 1, which includes a connector body 100, a cable connector 103, a power transmission male 101, and a power transmission female 102, wherein the cable connector 103, the power transmission male 101, and the power transmission female 102 are respectively disposed on a surface of the connector body 100.

Specifically, the cable connector 103, the power transmission male connector 101 and the power transmission female connector 102 need to be designed based on the same interface design standard, and the content of the interface design standard is mainly expressed in two aspects, on one hand, from the line structure, the three needs to have the same wiring structure, such as a communication line structure (double-line or triple-line) under the same protocol, and a power transmission line structure (highest allowable voltage 800V or 400V) under the same regulation; on the other hand, from the aspect of interface structure, the power transmission male head 101, the power transmission female head 102 and the cable joint 103 need to have specific physical structures so as to be matched with each other, for example, the power transmission male head 101 and the power transmission female head 102 need to have fixed physical structures so as to be matched with the male heads and the female heads of other devices.

According to the latest national standard guidance document GB/T20234.4-2023, a vehicle plug contact arrangement structure and a corresponding vehicle socket contact arrangement structure are specified in the national standard guidance document, and accordingly, when designing the dc charging connector according to the embodiment of the present invention, in order to ensure the application universality, the power transmission male head 101 and the power transmission female head 102 need to be kept consistent with the vehicle socket contact arrangement structure and the vehicle plug contact arrangement structure, respectively. While for the cable connector 103, a corresponding number of harness interfaces need to be provided to facilitate connection.

According to the current mainstream market standard definition, most basically, the cable joint 103 includes a main communication end 132 and a main power end 131, the power transmission male head 101 includes a first communication end 112 and a first power end 111, and the power transmission female head 102 includes a second communication end 122 and a second power end 121. In specific applications, no matter the power transmission or the signal transmission needs to be matched with the corresponding positive electrode wire and negative electrode wire, therefore, each of the communication end and the power end in the embodiment of the invention is actually corresponding to two wires of the positive electrode wire and the negative electrode wire.

Specifically, referring to the existing industry specifications, the electric car and the charging pile are subjected to negotiation charging in a communication mode, the charging pile adjusts a basic output form, such as voltage, according to the requirements of the electric car, and the electric car adjusts a charging load according to the power supply capacity of the charging pile. Thus, the communication and power terminals are the most basic component structures in the associated connector structure, and accordingly, the connector-associated physical structure is relatively fixed, as defined by the standard.

In the embodiment of the present invention, since the main improvement is not the specific physical structure of the dc charging connector, but the component configuration of the dc charging connector, only the basic component configuration diagram thereof is illustrated in fig. 3 of the accompanying drawings, and the specific expression form of the dc charging connector may be designed according to the idea of the embodiment of the present invention.

Correspondingly, inside the connector main body 100, the first communication end 112 and the second communication end 122 are respectively connected to the main communication end 132, and the first power end 111 and the second power end 121 are respectively connected to the main power end 131; the most basic logic of the design structure is that two connectors for external connection, namely a power transmission male connector 101 and a power transmission female connector 102, can be extended from a cable connector 103, wherein the power transmission male connector 101 can be directly used for charging a trolley, and the power transmission female connector 102 can be used for continuously connecting other direct current charging connectors. Through the design structure of the direct current charging connector, the most basic one-to-many charging type requirement of the charging pile can be met.

Further, since the charging pile cannot meet different charging requirements for different vehicles through only one basic output line, in order to solve the problem, in the embodiment of the present invention, the dc charging connector further includes a central control module 108, where the central control module 108 includes a control module 105, a near field communication unit 106, and a far field communication unit 107, and the near field communication unit 106 and the far field communication unit 107 are respectively connected with the control module 105.

Specifically, the first communication terminal 112 is connected to the main communication terminal 132 through the control module 105, and the control module 105 is configured to process data flowing from the first communication terminal 112 to the main communication terminal 132 and process data flowing from the main communication terminal 132 to the first communication terminal 112 through information received by the near field communication unit 106 and/or information received by the far field communication unit 107.

Specifically, the near field communication unit 106 is configured to communicate with a connection object of the power transmission male head 101, and in the application of the embodiment of the present invention, the connection object is mainly a vehicle to be charged and a charging pile, and correspondingly, the communication object of the near field communication unit 106 is a vehicle host in the vehicle to be charged and a charging host in the charging pile. For the electric car, most of the stock electric cars and newly developed electric cars have wireless communication functions, and in general, most of the wireless communication functions of the electric car are near field communication (limited to the interior of the car and covering a part of the area outside the surface of the car body) based on power consumption and applicability, accordingly, since the dc charging connector is plugged onto the electric car when applied, the near field communication unit 106 is provided in the dc charging connector, on one hand, communication with the corresponding electric car can be formed, and on the other hand, the near field communication unit 106 does not communicate with other electric cars due to the limitation of communication distance, that is, the electric car and the corresponding dc charging connector spontaneously form a corresponding relationship. Based on a similar principle, when the plugging object of the direct current charging connector is a charging pile, the direct current charging connector and the charging pile also spontaneously form a corresponding relation.

Specifically, the far-field communication unit 107 is configured to communicate with the far-field communication unit 107 in the other dc charging connector. According to the foregoing description of the near field communication unit 106, the dc charging connector can spontaneously form a corresponding relationship with the corresponding plugging object through the near field communication unit 106, and after the connection object of the dc charger can transmit information to the dc charging connector, networking joint communication is performed through the far field communication unit 107, so that interconnection is formed between the charging pile and each vehicle to be charged, that is, interconnection between the charging pile and the vehicles to be charged is formed through networking interconnection between a plurality of dc charging connectors.

A control module 105 is connected to a communication line for charging information interaction between the charging host and the charging-substituted vehicle, and directly acts to obtain and modify circulation data between the charging host and the charging-substituted vehicle through the control module 105, so that power transmission between the vehicle to be charged and the charging host can be changed by modifying the circulation data.

Considering that the stock electric car and the newly developed electric car have different hardware configurations, and that the stock charging pile and the newly developed charging pile also have different hardware configurations, in order to improve the universality of the direct current charging connector and the system formed by the direct current charging connector, if the charging between a plurality of vehicles to be charged cannot be coordinated by modifying the circulation data, two different communication devices of the near field communication unit 106 and the far field communication unit 107 are specially arranged in the embodiment of the invention. Under the setting form, by means of the near field communication unit 106 and the far field communication unit 107, the trolley and the charging pile foundation do not need to be changed in hardware, and the actual application requirements can be met only by means of OTA, software installation and the like; in actual use, the direct current charging connector provided by the embodiment of the invention has universality and can be used in stock vehicles and stock charging piles.

Further, the direct current charging connector of the embodiment of the present invention has a function of networking instead of a connection object, which is directly aimed at enabling interconnection communication between each vehicle to be charged and the charging pile, and may also instruct the control module 105 to operate through the communication of information in the communication local area network.

In a specific application, the direct current charging connector of the embodiment of the invention mainly has two application scenes.

On the one hand, according to the foregoing description, the power supply of the charging pile to the vehicle depends on the communication between the electric car and the charging pile, and if the existing vehicle hardware and the charging pile hardware are not changed or the existing vehicle software and the charging pile software are not rewritten, the communication information between the charging pile and the vehicle to be charged can be changed by the way that the control module 105 rewrites the communication information, so as to coordinate the charging relationship of each vehicle to be charged.

For example, in practical application, one of the vehicles to be charged requires a power supply voltage of 800V and supports a charging current of 100A at the highest, the power supply voltage of the charging pile is 800V and the distribution power is 8000W; theoretically, the vehicle to be charged can fully occupy the power supply resource of the charging pile under the highest charging power; however, in practical application, the vehicle to be charged cannot be completely maintained at the highest charging power in the whole charging process, and in practical consideration, the vehicle to be charged is required to provide the highest charging power for the vehicle to be charged without the need of providing the highest charging power for the vehicle to be charged in the whole charging process, and the charging logic is actively changed by the vehicle to be charged by rewriting the information returned to the vehicle to be charged by the charging pile, for example, the power distribution capacity of the charging pile is rewritten to 4000W, so that the vehicle to be charged is only operated at the charging power of 4000W; at this time, if another vehicle to be charged of the same type is connected to the charging pile, the vehicle can be operated at the charging power of 4000W based on the same manner.

It should be noted that, according to the physical law, the charging pile can only limit the output voltage and the output maximum power, and the external actual output power of the charging pile is determined by the load at the rear end, namely the vehicle to be charged; the charging power of the vehicle to be charged is determined by a vehicle host for charging and managing the battery pack; the direct current charging connector does not have a load adjusting function, and only the vehicle to be charged can be self-adjusted. In practical application, according to mutual coordination among vehicles to be charged, which are connected with the charging pile, the maximum output power of the charging pile can be well and fully used in the same time.

On the other hand, if the existing vehicle hardware and the existing charging pile hardware are changed or the existing vehicle software and the charging pile software are rewritten, the direct current charging connector of the embodiment of the invention can be used as a trigger, namely, when the direct current charging connector is connected to a vehicle to be charged and a charging pile, the charging pile and the charging vehicle are adjusted to a specific working mode, and under the specific working mode, the charging pile and the vehicle to be charged are required to be regulated and controlled by a system constructed based on the direct current charging connector so as to actively coordinate and realize the function of one-to-many charging of the charging pile.

Further, considering the theoretically infinite expansion capability of the dc charging connector, in the embodiment of the present invention, in order to solve the device conflict under some working conditions, the dc charging connector further includes an on-off switch 104, and the on-off state of the on-off switch 104 is controlled based on the control module 105; the on-off switch 104 is connected between the first power terminal 111 and the main power terminal 131. By setting the on-off switch 104, the circuit connection existing between the corresponding vehicle to be charged and the charging pile can be disconnected when needed, so that faults are avoided. Specifically, the on-off switch 104 has a simple implementation structure, a simple control manner, and a small volume and light weight of the related physical structure, so that the on-off switch 104 can be configured in a direct current charging connector, can be used for completely cutting off the transmission of electric power, and can be applied under specific working conditions.

Specifically, when the direct current charging connector provided by the embodiment of the invention is applied to a charging system, one charging pile can simultaneously meet the connection requirements of a plurality of vehicles from the physical aspect; through addding near field communication unit 106, far field communication unit 107, control module 105 and through the mode of connection to signal line changes, utilize electric power supply relation between electric car and the electric pile to coordinate the rule based on the communication, through the intervention of hardware to transfer data to the modification or through the mode of initiative communication coordinate electric pile and each electric car for a electric pile can rationally charge a plurality of electric cars.

The direct-current charging connector almost does not need to carry out hardware transformation on stock vehicles and stock charging piles in practical application, can be well compatible with most vehicles and charging piles, and has wide application range; the near field communication unit 106 is configured to enable communication between the vehicle and the direct current charging connector, and meanwhile, the direct current communication machine spontaneously forms a binding relationship with a connection object of the direct current charging connector; through the far-field communication unit 107, a networking relationship can be realized by phase change between the charging post and the plurality of vehicles, so that the charging conditions between the charging post and the plurality of vehicles can be coordinated according to related programs.

The dc charging connector according to the embodiment of the present invention is only used to illustrate the composition structure and basic usage logic of the dc charging connector, and specifically, the specific implementation of charging the charging pile and the plurality of vehicles based on the dc charging connector will be described later.

Referring to fig. 4 of the drawings, correspondingly, the invention further provides a direct current charging cable, which comprises two direct current charging connectors 1 and a total cable 2, wherein the cable joints 103 of the two direct current charging connectors 1 are respectively connected to two ends of the total cable 2 based on the interface design standard.

Fig. 6 is a schematic diagram of a charging host system according to an embodiment of the present invention, and n=3 is illustrated in fig. 6 for clarity of illustration. The charging host system is a multi-vehicle charging system built by the direct current charging pile.

Correspondingly, the invention also provides a charging host system which comprises a charging host, N vehicles to be charged and N direct current charging cables. It should be noted that, in the embodiment of the present invention, the number of dc charging cables corresponds to the number of vehicles to be charged; in practical applications, the charging host system may include more dc charging cables, but the redundant dc charging cables cannot perform a practical function, which is not included in the description of the embodiments of the present invention.

The charging host comprises a charging base station, a base station host, a base station power supply module and a base station communication module, wherein the base station host, the base station power supply module and the base station communication module are respectively arranged on the charging base station, a base station mother head is further arranged on the charging base station based on the interface design standard, the base station mother head is connected with the base station power supply module through the base station host, and the base station communication module is connected with the base station host;

The vehicle to be charged of the a-th vehicle comprises a-th vehicle main body, a-th vehicle battery assembly and a-th vehicle-mounted communication module, wherein the a-th vehicle main body, the a-th vehicle battery assembly and the a-th vehicle-mounted communication module are respectively arranged on the a-th vehicle main body, an a-th vehicle main head is further arranged on the a-th vehicle main body based on the interface design standard, the a-th vehicle main head is connected with the a-th vehicle battery assembly through the a-th vehicle main body, and the a-th vehicle-mounted communication module is connected with the a-th vehicle main body;

when a=1, the power transmission male head 101 of the direct current charging connector on one end of the a-th direct current charging cable is connected with the a-th vehicle female head in a matched manner, and the power transmission male head 101 of the direct current charging connector on the other end of the a-th direct current charging cable is connected with the base station female head in a matched manner;

when a >1, the power transmission male head 101 of the direct current charging connector on one end of the a-th direct current charging cable is connected with the a-th vehicle female head in a matched manner, and the power transmission male head 101 of the direct current charging connector on the other end of the a-th direct current charging cable is connected with one of the power transmission female heads 102 on the other direct current charging cable in a matched manner;

Wherein, a=1, 2,3, … …, N are positive integers, and N is greater than 1 because the application scenario for the embodiment of the invention is the situation that the direct current charging pile corresponds to multi-car charging.

The near field communication unit 106 on each direct current charging connector is in communication with a connection object of the power transmission male head 101 of the direct current charging connector, and all the direct current charging connectors form a communication local area network based on the corresponding far field communication unit 107.

Specifically, referring to fig. 6 of the drawings, the charging base station and the vehicle body are substantially existing devices, and the charging base station and the vehicle body are adaptively improved by the direct current charging cable provided by the embodiment of the invention. In the charging host system, two ends of the dc charging cable are respectively provided with a dc charging connector, and each dc charging connector can communicate with a corresponding accessed object, for example, the dc charging connector a communicates with the charging base station, and the dc charging connectors B, C, D communicate with corresponding vehicle bodies respectively. It should be noted that, since the power transmission female head 102 of the dc charging connector in the embodiment of the present invention has a fixed connection physical structure, each power transmission female head 102 can only be accessed by the power transmission male head 101 of one dc charging connector at most, so the essence of the mating connection between the power transmission male head 101 of the dc charging connector on the other end of the a-th dc charging cable and one of the power transmission female heads 102 of the other dc charging cable in the foregoing description also limits that each dc charging connector can only expand the content of one dc charging cable at most, and there is no case that two dc charging cables are connected to the same power transmission female head 102.

In addition, the access objects of the power transmission male head 101 of the dc charging connector in the embodiment of the present invention are the charging host, the vehicle to be charged and the power transmission female head 102 of the remaining dc charging connector, respectively, for the charging host and the vehicle to be charged, the corresponding dc charging connector needs to communicate with the charging host and the vehicle to be charged to realize the related functions, and for the power transmission female head 102 of the remaining dc charging connector, no new function needs to be additionally realized between the power transmission male head 101 and the power transmission female head 102 of the corresponding dc charging connector, so that the two do not have the necessity of communication. According to actual requirements, two mutually connected direct current charging connectors can be selected for communication so as to conveniently realize specified functions, such as the functions of constructing a system topological graph and the like; communication can be selected not to be carried out, so that communication nodes are reduced, and the simplicity of system topology is ensured.

Correspondingly, based on the charging host system, the embodiment of the invention also provides a direct current charging method, which comprises the following steps:

s01: all the direct current charging connectors with connection objects communicate with the corresponding connection objects based on the corresponding near field communication units 106, and in the charging host system, all the direct current charging connectors with connection objects respectively form a communication local area network based on the corresponding far field communication units 107;

The connection object is a charging host, a vehicle to be charged, or a direct-current charging connector.

Specifically, the dc charging connectors are in near-field communication with the corresponding connection objects, and all the dc charging connectors having the connection objects respectively integrally form a communication local area network based on the corresponding far-field communication unit 107. All the direct current charging connectors with the connection objects form the simplest structure of the communication local area network, in practical implementation, the direct current charging connector without the connection objects, namely the direct current charging connector only connected with the rest of the direct current charging connectors, can also participate in the construction of the communication local area network based on the corresponding remote communication module.

S02: taking a base station host or one of the control modules 105 or one of the vehicle hosts in the charging host system as an operation center;

the base station host, the control module 105 and the vehicle host all have computing capability, and according to the structural characteristics of the communication local area network, all the control module 105, the vehicle host and the base station host can mutually realize data transmission, and one computing center can be selected so as to facilitate the summarization processing of data.

S03: solving a system topology diagram of a communication local area network;

The content of the system topology diagram comprises a line connection structure between the charging base station and each vehicle to be charged.

Specifically, since each dc charging connector is connected to the communication loop of the system, and the control module 105 of each dc charging connector has information receiving and sending processing capability, based on the prior art, the system topology map of the communication local area network can be obtained by sorting relevant information in the whole communication loop.

For example, in the embodiment of the present invention, the dc charging connector a sends a message that can be directly received by the dc charging connector B, C, D, which indicates that the dc charging connector B, C, D is directly connected to the dc charging connector a, and there is only one possibility according to the limitation of the structure (referring to fig. 6, in the topology of the system, the dc charging connector B, C, D is equivalent to the dc charging connector a in parallel, and the exchange of the positions of the dc charging connectors B, C, D does not affect the operation of the system substantially); similarly, under a more complex system topology, the remaining dc charging connectors may also send messages, respectively, to determine the positions of the other dc charging connectors; and obtaining a unique system topological graph through confirmation of each direct-current charger and superposition solution of related information. If two interconnected direct current charging connectors are all involved in constructing a communication local area network, the transmission of each message on the direct current charging cable is fixed and known, and the construction of a system topology diagram can be completed only by sending out a message through one direct current charging connector, so that the solution of the system topology diagram is simpler.

Specifically, the content of the system topology diagram of the communication lan includes a circuit structure between the charging base station implemented based on the dc charging cable and each vehicle to be charged, and the specific structure can be understood as the structure shown in fig. 6 of the accompanying drawings, where the dashed box is a dc charging connector area that substantially participates in the construction of the communication lan.

S04: summarizing the power supply compatible information of the charging host and the charging compatible information of each vehicle to be charged through the operation center;

according to the prior art, the power supply compatible information of the charging host includes an output voltage and an output power corresponding to the output voltage, and the charging compatible information of the vehicle to be charged is a charging voltage.

Specifically, the method for summarizing the power supply compatibility information of the charging host and the charging compatibility information of each vehicle to be charged is that based on the cooperation action of the direct current charging connector, a base station host of the charging host and the vehicle host of each vehicle to be charged are sequentially subjected to one-time handshake, and the power supply compatibility information and the charging compatibility information are analyzed through the package content of one-time handshake.

S05, aiming at realizing a preset charging target, and making a charging plan according to the system topological graph, the power supply compatibility information and all the charging compatibility information;

S06: dividing all vehicles to be charged into more than one batch based on the charging plan, wherein the charging host machine charges each batch of vehicles to be charged in sequence;

specifically, on one hand, since different vehicles to be charged have different power supply compatibility information, particularly have differences in the allowable highest charging voltage, in order to avoid damage to the vehicles to be charged by high-voltage electricity, the vehicles to be charged with different charging voltages need to be batched; on the other hand, since the wiring mode in the charging host system is equivalent to connecting the vehicle to be charged to the charging host in parallel, and meanwhile, parallel branches can be further created on different parallel branches, the vehicle to be charged is accessed at random positions when being accessed into the system, and therefore, besides the influence of the power supply compatibility information, the problem of power transmissibility is also required to be considered; further, considering the final purpose, the difference of the final purpose also affects the formulation of the charging plan, for example, the final purpose is to increase the charging current rate of the vehicle, and the vehicle to be charged which can be partially charged with high power can be charged first; if the final objective is to increase the electrical power of all vehicles to be charged evenly, it is considered that if more vehicles to be charged are supplied at the same time. Therefore, the decision making of the charging plan is flexible, and the charging plan can be formulated according to actual conditions, and the final expression form is that the charging host sequentially charges the batched vehicles to be charged.

The batch specific implementation manner can be realized through the matching of the direct current charging connectors according to the requirements, for example, the control module 105 in the direct current charging connector can be adjusted to process the flowing data, so that the vehicle which does not participate in charging works in an ultralow load state; the on-off switch 104 can also be controlled directly by the control module 105 so that the vehicle not participating in the charging is completely disconnected from the power connection with the charging master.

When the charging host charges the vehicles to be charged in the same batch, the control module 105 in each direct current charging connector adjusts according to the charging plan, the output voltage of the charging host adjusts according to the charging plan, and the vehicles to be charged in the same batch actively adjust or passively adjust the charging load of the vehicles to be charged according to the charging plan.

In summary, the core idea of the direct current charging method of the embodiment of the invention is to fully utilize the charging resources of the charging host, and avoid the idling of the charging resources. When one vehicle to be charged cannot fully use the charging resources of the charging host, the charging host can provide the surplus charging resources for other vehicles to be charged; according to the foregoing description, the charging master is only able to regulate the constancy of the output voltage and the limit of the maximum output power, the actual charging power of each vehicle to be charged being determined by its own load.

In the parallel circuit, the characteristics of the electric power of the parallel circuit include that the total electric power of the parallel circuit is equal to the sum of the consumed electric power of each load, and the ratio of the electric power of each branch in the parallel circuit is equal to the inverse ratio of the electric resistance of each branch, so that the occupied power of each branch can be adjusted by adjusting the electric resistance (load) of each branch; correspondingly, in the charging host system of the embodiment of the invention, the charging resources occupied by the vehicle to be charged can be adjusted by changing the load of the vehicle to be charged.

Specifically, the load of the vehicle to be charged is essentially the vehicle battery assembly, specifically, the vehicle battery assembly is composed of a plurality of battery units, each battery unit is charged by precisely controlling current through the vehicle host, and in theory, the actual charging power of the vehicle battery assembly is determined by the vehicle host. For example, the vehicle host may adjust the overall load characteristics exhibited by the vehicle battery assembly by controlling the number of battery cells that are charged simultaneously. In other words, the load characteristic exhibited by the vehicle to be charged as a whole is adjustable by control of the vehicle main unit, and based on this idea, a theoretical support basis can be provided for allocation of charging resources by coordinating the respective vehicle main units.

Thus, in an alternative embodiment, the same batch of vehicles to be charged adjusts their own charging load according to the charging schedule, including:

the vehicle to be charged receives a charging plan sent by the corresponding direct-current charging connector through the remote communication unit based on the base station communication module, and a vehicle host of the vehicle to be charged adjusts the charging load of the vehicle to be charged according to the charging plan.

Specifically, if the charging host and the vehicle to be charged meet specific functional requirements, the vehicle to be charged can directly receive the charging plan through communication with the remote communication unit of the direct-current charging connector, and then actively adjust the charging load of the vehicle to be charged according to the charging plan so as to adapt to the whole charging system.

Also, in an alternative embodiment, the adjusting the charging load of the vehicles to be charged according to the charging schedule includes:

after receiving the charging plan, the remote communication unit on the direct current charging connector corresponding to the vehicle to be charged modifies the power supply compatibility information sent to the vehicle to be charged by the charging host according to the charging plan, and after receiving the modified power supply compatibility information, the vehicle to be charged adjusts the charging load of the vehicle according to the modified power supply compatibility information.

Specifically, if the charging host and the vehicle to be charged meet specific functional requirements, the direct current charging connector can directly modify the communication information between the vehicle to be charged and the charging host, so that the vehicle to be charged can adapt to the whole charging system according to the charging load regulated by the modified communication information.

The foregoing describes in detail a dc charging pile provided by the embodiments of the present invention, and specific examples are applied herein to illustrate the principles and embodiments of the present invention, where the foregoing examples are only for helping to understand the method and core idea of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.

Claims

1. The direct-current charging pile is characterized by comprising a charging host and a cable system;

Wherein N is an integer greater than 1.

2. The direct current charging pile of claim 1, wherein the central control module is configured to obtain, from each signal non-multiplexing section, bidirectional communication information between the corresponding vehicle to be charged and the charging host, including:

3. The direct current charging pile of claim 1, wherein the central control module comprises a control module and a far field communication unit;

4. A direct current charging pile according to claim 3, wherein after all the control modules form a communication local area network, one of the control modules is selected as a hub module;

5. The direct current charging stake of claim 3, wherein the central control module is further configured to send the allocated charging power information for each vehicle to be charged to the corresponding vehicle to be charged includes:

6. The dc charging stake of claim 3, wherein the central control module is further configured to send the output voltage to the charging host machine includes:

7. The direct current charging pile according to claim 3, wherein the central control module further comprises near field communication units, each control module is correspondingly connected with one near field communication unit, and the control module communicates with the corresponding vehicle to be charged based on the corresponding near field communication unit;

8. A dc charging pile according to any one of claims 1 to 7, wherein the cable system comprises N dc charging cables, each of which is provided with a power transmission male at both ends and at least one power transmission female at the dc charging cable;

Where a=1, 2, … …, N.

9. The dc charging stake of claim 8, wherein the dc charging cable includes a main cable and two dc charging connectors;