A method for multi-gun parallel charging of a direct-current charging pile

Abstract

The present application relates to the field of charging pile, and relates to a method for multi-gun parallel charging of a direct-current charging pile. The charging pile comprises at least one main gun and one auxiliary gun. The main gun and the auxiliary gun are connected through a CAN bus in the charging pile. A vehicle to be charged is provided with a BMS system and a plurality of charging interfaces connected to the BMS system. The method comprises connecting the main gun and the auxiliary gun to the charging interfaces of the vehicle to be charged, starting the charging mode of the vehicle to be charged by the main gun, establishing a communication link between the main gun, the auxiliary gun and the BMS system of the vehicle to be charged, and sending a vehicle message of the vehicle to be charged to the main gun and the auxiliary gun by the BMS system. The main gun sends a parallel charging request to the auxiliary gun through the CAN bus. The parallel charging request comprises the vehicle message received by the main gun. The auxiliary gun compares the vehicle message sent by the main gun with the vehicle message sent by the vehicle to be charged. If the vehicle messages are consistent, the auxiliary gun sends a parallel charging confirmation information to the main gun. The main gun converts into a parallel charging mode after receiving the parallel charging confirmation information.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of charging piles, more particularly to a method for multi-gun parallel charging of a direct-current charging pile. BACKGROUND

[0002] Therefore, with the support of environmental protection and national policy, the number of new energy electric vehicles is increasing, and the number of charging piles related thereto is also increasing. The charging convenience of electric vehicles is becoming more and more important, and the requirements for charging piles are also increasing. Most people will choose to use the vehicle during the day and charge at night. However, sometimes the vehicle needs to be used at night, resulting in insufficient charging time, so that the electric vehicle is not fully charged. Therefore, the charging efficiency of the charging pile becomes an important indicator for measuring the charging convenience thereof. At present, in order to improve the charging efficiency of the charging pile, some charging piles use single-pile multi-gun round charging mode.

[0003] Currently, multi-gun parallel charging is mainly achieved by detecting the port voltage multiple times and receiving messages of other guns on the CAN bus to determine whether it is the same vehicle. However, with the rapid increase in power of direct-current charging piles, it is possible that a direct-current charging pile charges multiple vehicles at the same time. In the face of such a situation, if the vehicle models are the same or the voltages are close, it is likely that a misjudgment will occur. SUMMARY

[0004] The present application provides a method for multi-gun parallel charging of a direct-current charging pile to solve the defects and deficiencies of the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is a method for multi-gun parallel charging of a direct-current charging pile. The charging pile comprises at least one main gun and one auxiliary gun. The main gun and the auxiliary gun are connected through a CAN bus in the charging pile. The vehicle to be charged is provided with a BMS system and a plurality of charging interfaces connected to the BMS system. The method comprises the following steps:

[0006] Step 1: Connect the main gun and the auxiliary gun to the charging interfaces of the vehicle to be charged. The main gun starts the charging mode for the vehicle to be charged. The main gun and the auxiliary gun establish communication with the BMS system of the vehicle to be charged. The vehicle to be charged sends its vehicle message to the main gun and the auxiliary gun through the BMS system.

[0007] Step 2: The main gun sends a parallel charging request to the auxiliary gun through the CAN bus. The parallel charging request includes the vehicle message received by the main gun.

[0008] Step 3: The auxiliary gun compares the vehicle message sent by the main gun with the vehicle message sent by the vehicle to be charged. If the vehicle messages are consistent, the auxiliary gun sends a parallel charging confirmation to the main gun through the CAN bus.

[0009] Step four: the main gun receives the confirmation information, and then the charging mode is converted to the parallel charging mode.

[0010] The method further includes step five: if the charging is completed, the main gun stops charging, and sends an end signal to the auxiliary gun through the CAN bus, the auxiliary gun stops charging and returns an end information to the main gun, and the main gun updates and updates the electric quantity and current information of the auxiliary gun this time.

[0011] If the auxiliary gun stops charging, the end information is sent to the main gun through the CAN bus, and the main gun updates the relevant parallel charging state and information.

[0012] In step one, the main gun contacts the charging interface of the device to be charged, and then sends a first input signal to the CAN bus, and the CAN bus turns on the first charging loop corresponding to the main gun.

[0013] The auxiliary gun contacts the charging interface of the device to be charged, and then sends a second input signal to the CAN bus, and the CAN bus turns on the second charging loop corresponding to the auxiliary gun.

[0014] In step four, the main gun and the auxiliary gun send parallel charging state data to each other during parallel charging, and the parallel charging state data includes charging electric quantity, charging current and whether to stop charging information.

[0015] In step four, the vehicle to be charged sends its continuously updated vehicle message to the main gun through the BMS system.

[0016] The vehicle message includes BRM vehicle identification message, BCP power battery charging parameter message, BCS battery charging total state message and BSM power battery state information message,

[0017] The BRM vehicle identification message includes vehicle battery type, vehicle battery rated capacity and vehicle identification code;

[0018] The BCP power battery charging parameter message includes the highest allowable total charging voltage of the vehicle battery, the highest allowable charging current, the highest allowable temperature, the state of charge of the whole vehicle power battery and the current battery voltage of the power battery;

[0019] The BCS battery charging total state message includes charging voltage and current measurement value, current state of charge, remaining charging time;

[0020] The BSM power battery state information message includes the highest temperature of the power battery, the lowest temperature of the power battery and the group number.

[0021] The main charging gun is the charging gun that first establishes communication with the BMS system of the vehicle to be charged.

[0022] The main gun and the auxiliary gun are both provided with contact switches.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides a method for charging multiple guns simultaneously on a DC charging pile. The charging pile is provided with multiple main guns and auxiliary guns. The main guns and auxiliary guns can identify whether they are connected to the same vehicle through vehicle messages. If they are connected to the same vehicle, the main guns and auxiliary guns enter a parallel charging mode, thereby enabling multiple guns of a charging pile to charge one vehicle at the same time, or a charging pile to charge multiple vehicles simultaneously with multiple guns, thereby improving the charging efficiency and convenience of the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a step diagram of a method for charging multiple DC charging stations in parallel according to the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings. These drawings are simplified schematic diagrams and only illustrate the basic steps of the present invention in a schematic manner.

[0027] like Figure 1 As shown, a method for charging multiple DC charging pile guns simultaneously is provided. The charging pile includes at least one main gun and one auxiliary gun, and the main gun and auxiliary gun are connected via a CAN bus in the charging pile. The vehicle to be charged is provided with a BMS system and several charging interfaces connected to the BMS system. The method includes the following steps:

[0028] Step 1: Connect the main gun and the auxiliary gun to the charging port of the vehicle to be charged. The main gun starts the charging mode for the vehicle to be charged. The main gun and the auxiliary gun establish communication with the BMS system of the vehicle to be charged. The vehicle to be charged sends its vehicle message to the main gun and the auxiliary gun through the BMS system;

[0029] Step 2: The main gun sends a charging request to the auxiliary gun via the CAN bus, wherein the charging request includes the vehicle message received by the main gun;

[0030] Step 3: The secondary gun compares the vehicle message sent by the primary gun with the vehicle message sent by the vehicle to be charged. If the vehicle messages are consistent, a charging confirmation message is sent to the primary gun via the CAN bus.

[0031] Step 4: When the master gun receives the parallel charging confirmation information, it switches from the charging mode to the parallel charging mode.

[0032] The charging pile is internally provided with a plurality of controllers connected with the CAN bus, the controllers exchange information through the CAN communication line inside the charging pile, each controller is connected with a charging gun which can be a main gun or a secondary gun.

[0033] In step one, when the main gun and the secondary gun are connected with the charging interface of the vehicle to be charged, the state of the main gun and the secondary gun needs to be checked, if the main gun is in a fault or standby state and cannot charge, the main gun is replaced, if the secondary gun is in a fault or standby state and cannot charge, the secondary gun is replaced.

[0034] In step four, if the main gun does not receive the charging confirmation information sent by the secondary gun within a certain time period, the main gun exits the charging confirmation and enters the single gun charging mode.

[0035] The charging mode in the application is generally that one charging gun charges one vehicle to be charged, the charging gun exchanges information with the corresponding vehicle to be charged, and the vehicle to be charged continuously updates the vehicle message and sends it to the charging gun; the charging mode is generally that multiple charging guns charge the same vehicle to be charged, the charging guns have a difference between the main gun and the secondary gun, and the main gun and the secondary gun can exchange information through the CAN bus, the main gun exchanges information with the vehicle to be charged, and the vehicle to be charged continuously updates the vehicle message and sends it to the main gun.

[0036] The method further comprises step five, if the charging is completed, the main gun stops charging, the main gun sends an end signal to the secondary gun through the CAN bus, the secondary gun stops charging and returns an end information to the main gun, and the main gun counts and updates the electric quantity and current information of the secondary gun in this charging. The end information includes the electric quantity and current information of the secondary gun in this charging.

[0037] The step five further comprises that if the secondary gun stops charging, an end information is sent to the main gun through the CAN bus, and the main gun updates the related charging state and information. The condition that the secondary gun stops charging is generally that the secondary gun fails to charge or cannot be in the charging mode. The main gun updates the related charging state and information, the related charging state is which secondary gun is in the charging state with the main gun, and the information includes the charging electric quantity and current information of the main gun and the secondary gun.

[0038] In step one, when the main gun and the secondary gun are connected with the charging interface of the vehicle to be charged, the state of the main gun and the secondary gun needs to be checked, if the main gun is in a fault or standby state and cannot charge, the main gun is replaced, if the secondary gun is in a fault or standby state and cannot charge, the secondary gun is replaced.

[0039] When the secondary gun contacts with the charging interface of the device to be charged, a second input signal is sent to the CAN bus, and the CAN bus conducts the second charging loop corresponding to the secondary gun.

[0040] In this embodiment, the main gun contacts the charging interface of the device to be charged, triggering the contact switch on the main gun, which sends a conduction signal to the controller on the CAN bus corresponding to the main gun, which controls the conduction of the first charging circuit, the main gun starts the charging mode of the vehicle to be charged, and the main gun establishes communication with the BMS system of the vehicle to be charged, and the vehicle to be charged sends its vehicle message to the main gun through the BMS system;

[0041] The auxiliary gun contacts the charging interface of the device to be charged, triggering the contact switch on the auxiliary gun, which sends a conduction signal to the controller on the CAN bus corresponding to the main gun, which controls the conduction of the second charging circuit, and the auxiliary gun establishes communication with the BMS system of the vehicle to be charged, and the vehicle to be charged sends its vehicle message to the auxiliary gun through the BMS system; the main gun sends a parallel charging request including the vehicle message to the auxiliary gun through the CAN bus, the auxiliary gun compares the vehicle message in the parallel charging request with the vehicle message it receives, and if the vehicle messages are consistent, it sends a parallel charging confirmation information to the main gun through the CAN bus, and the main gun converts from the charging mode to the parallel charging mode.

[0042] In step four, the main gun and the auxiliary gun send parallel charging state data to each other during the parallel charging process, and the parallel charging state data includes charging power, charging current, and fault stop information.

[0043] In step four, the vehicle to be charged sends its continuously updated vehicle message to the main gun through the BMS system.

[0044] The vehicle message includes BRM vehicle identification message, BCP power battery charging parameter message, BCS battery charging total state message, and BSM power battery state information message,

[0045] The BRM vehicle identification message includes vehicle battery type, vehicle battery rated capacity, and vehicle identification code;

[0046] The BCP power battery charging parameter message includes the highest allowed total charging voltage of the vehicle battery, the highest allowed charging current, the highest allowed temperature, and the state of charge of the vehicle power battery and the current battery voltage of the power battery;

[0047] The BCS battery charging total state message includes charging voltage and current measurement value, current state of charge, and remaining charging time;

[0048] The BSM power storage battery state information message includes the highest temperature of the power storage battery, the lowest temperature of the power storage battery and a group number. The power storage battery includes multiple groups of batteries, each group of batteries is provided with a corresponding group number, and each group of batteries is respectively provided with a temperature detection device to detect the highest temperature and the lowest temperature thereof.

[0049] The main gun is the charging gun that first establishes communication with the BMS system of the vehicle to be charged. The main gun and the auxiliary gun of the present application are both charging guns with consistent functions, except that the charging modes are different. If the charging gun is used to charge different vehicles to be charged, the functions are consistent. Only when multiple charging guns are used to charge the same vehicle to be charged and enter the parallel charging mode, the main gun and the auxiliary gun are distinguished. After entering the general charging mode, there is no information exchange between the charging guns, and the charging gun establishes communication with the BMS system of the vehicle to be charged. After entering the parallel charging mode, only the main gun establishes communication with the BMS system of the vehicle to be charged, and the vehicle to be charged sends its continuously updated vehicle message to the main gun through the BMS system. The main gun is used to count the state data of the auxiliary gun, such as the charging capacity, the charging current and whether to stop charging due to failure, and to convey the vehicle message of the vehicle to be charged to the auxiliary gun. The auxiliary gun charges according to the vehicle message and the instruction of the main gun. If the auxiliary gun is not faulty, the auxiliary gun stops charging only when the main gun stops charging and sends an end signal.

[0050] The main gun and the auxiliary gun are both provided with a contact switch.

[0051] The application scenario of the method for parallel charging of the DC charging pile of the present application includes a charging pile and a vehicle to be charged. The vehicle to be charged includes an electric vehicle, which includes but is not limited to an electric car and an electric bus. The following embodiment takes two charging guns as a specific description. In fact, the charging pile can also have three charging guns, four charging guns, five charging guns, etc., and the control method is suitable for two charging guns, which will not be described here.

[0052] In this embodiment, if two charging guns of the same charging pile are inserted into the same vehicle to be charged, the charging gun connected with the vehicle to be charged first is the main gun, and the charging gun connected with the vehicle to be charged later is the auxiliary gun. The main gun contacts the charging interface of the device to be charged and triggers the contact switch on the main gun, which sends a conduction signal to the controller corresponding to the main gun on the CAN bus. The controller controls the conduction of the first charging circuit, the main gun starts the charging mode of the vehicle to be charged, and the main gun establishes communication with the BMS system of the vehicle to be charged. The vehicle to be charged sends its vehicle message to the main gun through the BMS system. The auxiliary gun contacts the charging interface of the device to be charged and triggers the contact switch on the auxiliary gun, which sends a conduction signal to the controller corresponding to the main gun on the CAN bus. The controller controls the conduction of the second charging circuit, and the auxiliary gun establishes communication with the BMS system of the vehicle to be charged. The vehicle to be charged sends its vehicle message to the auxiliary gun through the BMS system.

[0053] The main gun sends a parallel charging request including the vehicle message to the auxiliary gun through the CAN bus. The auxiliary gun compares the vehicle message in the parallel charging request with the vehicle message received by it. If the vehicle messages are consistent, the auxiliary gun sends a parallel charging confirmation information to the main gun through the CAN bus. The main gun converts from the charging mode to the parallel charging mode.

[0054] During the parallel charging process, the main gun always interacts with the vehicle to be charged, the main gun transmits the electric quantity to the vehicle to be charged, the vehicle to be charged continuously updates the vehicle message and sends it to the main gun, the main gun continuously interacts with the auxiliary gun, the auxiliary gun continuously feeds back the charging quantity and other charging conditions to the main gun, and the main gun feeds back the charging state and the vehicle message to the auxiliary gun. The auxiliary gun charges the vehicle to be charged with the main gun under the condition of no fault. If the main gun exits the parallel charging mode or stops charging, the auxiliary gun exits the parallel charging mode or stops charging with the main gun.

[0055] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0056] The embodiments of methods, hardware systems, software systems, and computer program products of the present application can be implemented by computer program instructions embodied in a non-transitory computer-readable medium such as floppy diskettes, CD-ROMs, hard disks, optical disks, solid state drives, or any other computer-readable medium. A processor in combination with the computer-readable medium provides the essential code to practice the application. The present application is not limited by the Figure 1 one or more functions specified in the flow or flows and / or blocks Figure 1 one or more functions specified in the flow or flows and / or blocks

[0057] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flow Figure 1 one or more functions specified in the flow or flows and / or blocks Figure 1 one or more functions specified in the flow or flows and / or blocks

[0058] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 one or more functions specified in the flow or flows and / or blocks Figure 1 one or more functions specified in the flow or flows and / or blocks

[0059] While the preferred embodiments of the application have been described, additional variations and modifications can be made to the embodiments by those of skill in the art once they have the benefit of the present disclosure without departing from the spirit and scope of the application. Accordingly, the attached claims are intended to embrace all such variations and modifications as fall within the scope of the present application.

[0060] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

[0061] The above description is intended to be illustrative and not restrictive. Many other modifications within the scope of the present application will be readily apparent to those of skill in the art, and the scope of the present application should in no way be limited only to the described embodiments, but can include all modifications made within the spirit and scope of the application.

Claims

1. A method for multi-gun parallel charging of a direct current charging pile, characterized in that, The charging pile comprises at least one main gun and one auxiliary gun, the main gun and the auxiliary gun are connected through a CAN bus in the charging pile, the vehicle to be charged is provided with a BMS system and a plurality of charging interfaces connected with the BMS system, and the method comprises the following steps: Step one: connecting the main gun and the auxiliary gun with the charging interfaces of the vehicle to be charged, starting the charging mode of the vehicle to be charged by the main gun, establishing the communication connection between the main gun, the auxiliary gun and the BMS system of the vehicle to be charged, and sending the vehicle message of the vehicle to be charged to the main gun and the auxiliary gun by the BMS system; Step two: sending the parallel charging request to the auxiliary gun by the main gun through the CAN bus, wherein the parallel charging request comprises the vehicle message received by the main gun; Step three: comparing the vehicle message sent by the main gun with the vehicle message sent by the vehicle to be charged by the auxiliary gun, and if the vehicle messages are consistent, sending the parallel charging confirmation information to the main gun through the CAN bus; Step four: if the main gun receives the parallel charging confirmation information, the charging mode is converted into the parallel charging mode; if the main gun does not receive the parallel charging confirmation information from the auxiliary gun within a certain period of time, the main gun exits the parallel charging mode and enters the single gun charging mode; If the auxiliary gun stops charging, the end information is sent to the main gun through the CAN bus, and the main gun updates the related parallel charging state and information; the auxiliary gun stops charging in the case that the auxiliary gun fails to charge or cannot be in the parallel charging mode; the main gun updates the related parallel charging state and information, wherein the related parallel charging state is which auxiliary gun is in the parallel charging state with the main gun, and the information comprises the charging power and current information of the main gun and the auxiliary gun; if the auxiliary gun has no fault, the auxiliary gun stops charging only when the main gun stops charging and sends the end signal; if the main gun exits the parallel charging mode or stops charging, the auxiliary gun exits the parallel charging mode or stops charging with the main gun; The main gun is the charging gun that first establishes the communication connection with the BMS system of the vehicle to be charged; when the charging gun charges different vehicles to be charged, the functions are consistent; only when a plurality of charging guns charge the same vehicle to be charged in the parallel charging mode, the main gun and the auxiliary gun are distinguished; The vehicle to be charged sends the continuously updated vehicle message to the main gun through the BMS system; The vehicle message comprises a BRM vehicle identification message, a BCP power battery charging parameter message, a BCS battery charging total state message and a BSM power battery state information message, The BRM vehicle identification message comprises the vehicle battery type, the vehicle battery rated capacity and the vehicle identification code; The BCP power battery charging parameter message comprises the highest allowed total charging voltage, the highest allowed charging current, the highest allowed temperature, the state of charge of the whole vehicle power battery and the current battery voltage of the power battery; The BCS battery charging total state message comprises the charging voltage and current measurement value, the current state of charge and the remaining charging time; The BSM power battery state information message comprises the highest temperature of the power battery, the lowest temperature of the power battery and the group number.

2. The method for DC charging pile multi-gun parallel charging according to claim 1, characterized in that: The method further comprises a step five, if the charging is completed, the main gun stops charging, the main gun sends an end signal to the auxiliary gun through the CAN bus, the auxiliary gun stops charging and returns an end information to the main gun, and the main gun counts and updates the electric quantity and current information of the auxiliary gun in this charging.

3. The method of claim 2, wherein: In the step one, the main gun contacts the charging interface of the vehicle to be charged, and then a first input signal is sent to the CAN bus, and the CAN bus turns on a first charging circuit corresponding to the main gun; The auxiliary gun contacts the charging interface of the device to be charged, and then a second input signal is sent to the CAN bus, and the CAN bus turns on a second charging circuit corresponding to the auxiliary gun.

4. The method of Claim 3, wherein: In the step four, the main gun and the auxiliary gun send parallel charging state data to each other during the parallel charging, and the parallel charging state data comprises charging electric quantity, charging current and whether to stop charging due to failure.

5. The method of claim 4, wherein: The main gun and the auxiliary gun are both provided with a contact switch.

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