Mobile charging gun extension system and conversion method

Abstract

The mobile charging gun expansion system comprises a lithium battery pack and a direct-current busbar which are integrated in the expansion system, the input side of the direct-current busbar is connected with a charging gun input interface, and the output side of the direct-current busbar is connected with a corresponding charging gun through a plurality of control modules to form an independent path. The expansion system is borne on the electric chassis; the conversion method comprises the following steps: expanding the number of charging guns, that is, external charging guns are connected through an expansion system and then independently output through the plurality of charging guns; the power of the charging guns is expanded, and on the basis that the external charging guns provide the output power, the expansion system provides additional output power for the multiple charging guns through the lithium battery pack; a charging gun interface is expanded, namely the interface of the charging gun adapts to the specification standard of the output requirement; the system is convenient to use, high in charging efficiency, high in compatibility and flexible in layout, and the system performance is improved.

Description

Technical Field

[0001] The present invention relates to a mobile charging gun expansion system, and in particular to a mobile charging gun expansion system and a conversion method. Background Art

[0002] A DC charging pile is a power supply device that is fixedly installed outside an electric vehicle, connected to the AC power grid, and directly provides DC power to the electric vehicle's power battery. It can convert AC power into DC power to meet the electric vehicle's fast charging needs.

[0003] The existing electric vehicle charging stations have insufficient number of charging guns on the DC charging piles, the power of the charging guns does not meet the demand, the charging output interfaces are inconsistent, and due to environmental restrictions, the charging stations are not convenient to transform, and there are also technical problems such as poor power distribution of the charging guns.

[0004] The existing technology for improving the above technical problems also has the following defects:

[0005] (1) Complex system structure and high cost: To realize the technical solution of two charging gun outputs, the DC charging pile dual-gun charging equipment needs to install two sets of charger systems, which increases the system structure and manufacturing cost. The two sets of charger systems are highly dependent on each other. If one of them fails or is damaged, it may affect the normal operation of the entire charging pile.

[0006] (2) High requirements for the power grid: The DC charging pile dual-gun charging equipment obtains electricity from the power grid and converts the electricity into DC power suitable for charging electric vehicles through the power module. DC charging pile technology requires high power grid capacity and stability to support it. If the power grid capacity is insufficient or the stability is poor, it may affect the normal operation and charging efficiency of the charging pile. Therefore, when using a DC charging pile dual gun and increasing the number of DC charging piles, it is necessary to consider the carrying capacity and stability of the power grid.

[0007] (3) Redundant design and undersized design: The DC charging pile dual-gun charging equipment adopts a high-power and dual-gun design to meet the needs of charging high-power electric vehicle batteries. In some cases, if the two systems cannot work in full coordination, it may lead to reduced energy efficiency. For example, when one system is charging an electric vehicle, the other system may be idle, resulting in energy waste. On the other hand, when the design power is too small, it cannot meet the charging power requirements of some models.

[0008] (4) Inconsistent charging gun interface: The charging gun output interface of the DC charging pile is inconsistent with the electric vehicle charging interface. It is necessary to pay attention to the compatibility and application scope of the DC charging pile. When the interfaces are inconsistent, the DC charging pile cannot charge the electric vehicle.

[0009] (5) Charging power allocation problem: Although the DC charging pile dual-gun charging equipment has the power allocation function, in some cases, if the charging requirements of the two vehicles are very different, the charging pile may find it difficult to achieve completely fair power allocation. This may affect the user's charging experience and satisfaction. Summary of the invention

[0010] In order to solve the deficiencies of the above-mentioned technologies, the present invention provides a mobile charging gun expansion system and conversion method.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is: a mobile charging gun expansion system, including a lithium battery pack and a DC busbar integrated in the expansion system, the input side of the DC busbar is connected to the charging gun input interface, and the output side of the DC busbar is connected to the corresponding charging guns through multiple control modules to form an independent path, and the expansion system is carried on the electric chassis.

[0012] Furthermore, the charging gun input interface is adapted to an external charging gun that is pluggable and connected.

[0013] Furthermore, the surface of the DC busbar is tinned and covered with a heat shrink tubing.

[0014] Furthermore, the speed of the electric chassis is dynamically variable from 0 to 10 km / h, the turning radius is 3.6 meters, and the maximum climbing grade is 20%.

[0015] Furthermore, the discharge rate of the lithium battery pack is 0.5P to 1P.

[0016] A conversion method for a mobile charging gun expansion system includes:

[0017] Expand the number of charging guns, that is, external charging guns are connected through the expansion system and output independently through multiple charging guns;

[0018] Expand the power of the charging gun. On the basis of the output power provided by the external charging gun, the expansion system provides additional output power for multiple charging guns through the lithium battery pack;

[0019] Expand the charging gun interface, that is, the charging gun interface adapts to the specification standards of output requirements.

[0020] Furthermore, the workflow for expanding the charging gun power is as follows:

[0021] The lithium battery pack and the charging gun input interface connected to the external charging gun are respectively supplied to the DC busbar, and then output to multiple control modules through the DC busbar, and then output to the outside through multiple charging guns;

[0022] Among them, the sum of the lithium battery pack discharge power plus the external charging gun input power is equal to the sum of the output power of multiple charging guns. The formula is as follows:

[0023] P_in+P_bat1=P_out1+P_out2,

[0024] Where, P_in is the input power of the external charging gun; P_bat1 is the discharge power of the lithium battery pack; P_out1 and P_out2 are the output power of a single charging gun respectively.

[0025] Furthermore, when the charging gun output is idle, the lithium battery pack performs a charging operation, and the operation process is as follows:

[0026] The external charging gun is connected to the charging gun input interface, and then the DC busbar supplies power to the lithium battery pack;

[0027] Among them, the charging power of the lithium battery pack is equal to the input power of the external charging gun, and the formula is as follows:

[0028] P_bat2=P_in,

[0029] Where P_bat2 is the charging power of the lithium battery pack, and P_in is the input power of the external charging gun.

[0030] Furthermore, when the sum of the output powers of multiple charging guns is less than the rated input power of the external charging gun, the excess input power is used to supplement the lithium battery pack. The supplementary power of the lithium battery pack is equal to the input power of the external charging gun minus the sum of the output powers of multiple charging guns. The formula is as follows:

[0031] P_bat2=P_in-(P_out1+P_out2),

[0032] Where, P_bat2 is the charging power of the lithium battery pack, P_in is the input power of the external charging gun, and P_out1 and P_out2 are the output power of a single charging gun respectively.

[0033] A mobile charging gun expansion system and conversion method has the following advantages:

[0034] (1) Convenient to use: The system is designed to convert one charging gun input into two charging gun outputs, which greatly improves the user's convenience. Users can find an idle charging gun without waiting, effectively shortening the waiting time.

[0035] (2) High charging efficiency: By extending the power of the charging gun, the system can fully charge the electric vehicle in a shorter time, greatly improving the charging efficiency. This is especially important for vehicles that need to be recharged quickly and for private cars traveling long distances. The system can automatically adjust the charging power according to factors such as battery status and charging requirements to ensure that the charging process is both fast and safe.

[0036] (3) High compatibility: The system expands the charging gun interface and supports multiple charging interface standards (such as CCS, GB / T, etc.), ensuring compatibility with electric vehicles of different brands and models, thereby improving the versatility and flexibility of the charging system.

[0037] (4) Flexible layout: The system has the ability to move and can flexibly adjust its position according to actual needs. This is particularly suitable for temporary charging stations, auto shows, outdoor activities and other scenarios. It reduces labor costs and operational difficulties, and improves work efficiency and safety. Flexible layout can maximize the use of space resources and meet the charging needs of more vehicles.

[0038] (5) Improve system performance: The system adopts a shared DC busbar design, which can optimize the output power distribution between charging guns and ensure that each charging gun can obtain a stable power supply. This reduces the complexity and calculation amount of the algorithm, reduces the mutual influence between the two charging guns and the fluctuation of the power grid, and improves system performance.

[0039] The present invention not only improves charging efficiency and compatibility, but also enhances system stability and safety, providing users with a more reliable charging experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of the present invention.

[0041] Figure 2 This is a power allocation control flow chart of the present invention.

[0042] Figure 3 It is a composition diagram of the control module of the present invention.

[0043] In the figure: 1. Lithium battery pack; 2. External charging gun; 3. Charging gun input interface; 4. DC busbar; 5. Control module; 6. Charging gun output; 7. Electric chassis. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] The present embodiment relates to a mobile charging gun expansion system and a conversion method. The mobile charging gun expansion system includes a lithium battery pack 1 and a DC busbar 4 integrated in the expansion system. The input side of the DC busbar 4 is connected to a charging gun input interface 3. The output side of the DC busbar 4 is connected to corresponding charging guns 6 through multiple control modules 5 to form an independent path. The expansion system is carried on an electric chassis 7. The charging gun input interface 3 is adapted to a plug-in external charging gun 2. In the present embodiment, there are two control modules 5 and two charging guns 6.

[0046] Based on the above structure, in this embodiment, the specific parameter specifications of the lithium battery pack 1 are 230Ah, 1P128S, and a voltage of 409.6V. The lithium battery pack 1 includes a battery management system BMS, a fuse 250A, a total positive connection plug-in, and a total negative connection plug-in. The discharge rate of the lithium battery pack 1 is 0.5P~1P;

[0047] The specifications of the external charging gun 2 are rated voltage DC1000V, rated current 250A, and operating environment temperature -30℃~55℃;

[0048] The specifications of the charging gun input interface 3 are rated voltage DC1000V, rated current 250A, and working environment temperature -30℃~55℃;

[0049] The material of the DC busbar 4 is preferably T2 copper, with a cross-sectional area of ​​100 mm2 and a current carrying capacity of 280 A. The surface of the DC busbar 4 is tinned and covered with a heat shrink tubing;

[0050] The specification parameters of the control module 5 are rated power 150kW, output voltage 200-1000V, output current 250Amax, and the control module 5 has output overvoltage protection, overtemperature protection, busbar voltage fault protection, and short circuit protection. It should be noted that the control module 5 Figure 3 As shown, the DC charging control includes low-voltage power supply 9-16Vdc, CP detection, electronic lock control, temperature detection, CAN communication, wake-up function, current and voltage acquisition, and contactor control; the low-voltage power supply 9-16Vdc controls the low-voltage input of the module, and the normal working voltage range is 9-16Vdc; the CP detection control module complies with the CP detection required by the GB / T18487.1 standard; the electronic lock control module has an electronic lock function; the temperature detection control module has temperature detection, and monitors the temperature range of the module inside, plug-in, and busbar after power-on wake-up. If the preset value is exceeded, the module will operate or shut down, and record the fault; the CAN communication control module and the BMS adopt CAN communication mode, support UDS and debugging functions; the wake-up function supports CP wake-up and CAN wake-up; the current and voltage acquisition, that is, the collection has current and voltage acquisition functions, which are used to monitor the current and voltage values ​​of the charging circuit in real time; the contactor control contactor closes and disconnects the circuit between the lithium battery pack, DC busbar, and charging gun, and monitors the contactor status;

[0051] The specifications of the charging gun 6 are rated voltage DC1000V, rated current 250A, and working environment temperature -30℃~55℃;

[0052] The dimensions of the electric chassis 7 in this embodiment are L2100*W880*H450mm, it is movable and has a speed of 0-10km / h that can be dynamically changed, a turning radius of 3.6 meters, a climbing grade of 20%, and a load-bearing capacity of 1.5 tons. The electric chassis 7 is prior art, and this is hereby explained.

[0053] The mobile charging gun expansion system and conversion method include three complementary methods, specifically:

[0054] Expanding the number of charging guns, that is, the external charging gun 2 is connected through the expansion system and outputs independently through multiple charging guns 6; it should be noted that expanding the number of charging guns is the basis for improving the service capacity of the charging system, and this expansion improvement is the physical basis for other expansion methods.

[0055] Expand the charging gun power. On the basis of the output power provided by the external charging gun 2, the expansion system provides additional output power for multiple charging guns 6 through the lithium battery pack 1. This method improves performance. Expanding the charging gun power can significantly shorten the charging time and improve charging efficiency.

[0056] On this basis, the power distribution control process is as follows Figure 2 As shown, when the input power of the external charging gun 2 is greater than the sum of the output powers of multiple charging guns 6, charging is performed directly; when the input power of the external charging gun 2 is less than the sum of the output powers of multiple charging guns 6, the extended system is used to calculate the power difference between the two, and the lithium battery pack 1 is used to supplement the output according to the required power.

[0057] Preferably, the lithium battery pack 1 and the charging gun input interface 3 connected to the external charging gun 2 are respectively supplied to the DC busbar 4, and then output to multiple control modules 5 through the DC busbar 4, and then output to the outside through multiple charging guns 6; wherein, the sum of the discharge power of the lithium battery pack 1 plus the input power of the external charging gun 2 is equal to the sum of the output powers of the multiple charging guns 6, and the formula is as follows:

[0058] P_in+P_bat1=P_out1+P_out2,

[0059] Wherein, P_in is the input power of the external charging gun 2; P_bat1 is the discharge power of the lithium battery pack 1; P_out1 and P_out2 are the output power of a single charging gun 6 respectively.

[0060] Preferably, when the output of the charging gun 6 is idle, the lithium battery pack 1 performs a charging operation, and the operation process is as follows:

[0061] The external charging gun 2 is connected to the charging gun input interface 3, and then supplies power to the lithium battery pack 1 through the DC busbar 4; wherein, the supplementary power of the lithium battery pack 1 is equal to the input power of the external charging gun 2, and the formula is as follows:

[0062] P_bat2=P_in,

[0063] Wherein, P_bat2 is the charging power of the lithium battery pack 1, and P_in is the input power of the external charging gun 2.

[0064] Preferably, when the sum of the output powers of the multiple charging guns 6 is less than the rated input power of the external charging gun 2, the excess input power is used to supplement the power of the lithium battery pack 1, and the supplementary power of the lithium battery pack 1 is equal to the input power of the external charging gun 2 minus the sum of the output powers of the multiple charging guns 6, and the formula is as follows:

[0065] P_bat2=P_in-(P_out1+P_out2),

[0066] Wherein, P_bat2 is the charging power of the lithium battery pack 1, P_in is the input power of the external charging gun 2, and P_out1 and P_out2 are the output powers of a single charging gun 6 respectively.

[0067] The extended charging gun interface, that is, the interface of the charging gun 6 is adapted to the specification standard of the output requirements. In actual applications, according to the requirements, it can be the output of the charging gun 6 with the same interface, or it can be converted to the output of the charging gun 6 with a different interface.

[0068] On this basis, the interface type is identified through the communication protocol between the charging gun 6 and the charging device. Each charging standard (such as the national standard GB / T, the European standard IEC 62196, the American standard SAE J1772, etc.) defines a specific communication protocol for data transmission and control during the charging process.

[0069] The present application discloses a mobile charging gun expansion system and conversion method, which has the following advantages:

[0070] (1) Convenient to use: The system is designed to convert one charging gun input into two charging gun outputs, which greatly improves the user's convenience. Users can find an idle charging gun without waiting, effectively shortening the waiting time.

[0071] (2) High charging efficiency: By extending the power of the charging gun, the system can fully charge the electric vehicle in a shorter time, greatly improving the charging efficiency. This is especially important for vehicles that need to be recharged quickly and for private cars traveling long distances. The system can automatically adjust the charging power according to factors such as battery status and charging requirements to ensure that the charging process is both fast and safe.

[0072] (3) High compatibility: The system expands the charging gun interface and supports multiple charging interface standards (such as CCS, GB / T, etc.), ensuring compatibility with electric vehicles of different brands and models, thereby improving the versatility and flexibility of the charging system.

[0073] (4) Flexible layout: The system has the ability to move and can flexibly adjust its position according to actual needs. This is particularly suitable for temporary charging stations, auto shows, outdoor activities and other scenarios. It reduces labor costs and operational difficulties, and improves work efficiency and safety. Flexible layout can maximize the use of space resources and meet the charging needs of more vehicles.

[0074] (5) Improve system performance: The system adopts a shared DC busbar design, which can optimize the output power distribution between charging guns and ensure that each charging gun can obtain a stable power supply. This reduces the complexity and calculation amount of the algorithm, reduces the mutual influence between the two charging guns and the fluctuation of the power grid, and improves system performance.

[0075] The present invention not only improves charging efficiency and compatibility, but also enhances system stability and safety, providing users with a more reliable charging experience.

[0076] The above implementation modes are not limitations of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the scope of the technical solution of the present invention also belong to the protection scope of the present invention.

Claims

1. A mobile charging gun expansion system, characterized by: The invention comprises a lithium battery pack (1) and a DC busbar (4) integrated in an extended system, wherein the input side of the DC busbar (4) is connected to a charging gun input interface (3), and the output side of the DC busbar (4) is connected to corresponding charging guns (6) through a plurality of control modules (5) to form an independent path, and the extended system is carried on an electric chassis (7).

2. The mobile charging gun expansion system according to claim 1, characterized in that: The charging gun input interface (3) is adapted to an external charging gun (2) that is plug-in connected.

3. The mobile charging gun expansion system according to claim 1, characterized in that: The surface of the DC busbar (4) is tinned and sleeved with a heat shrink tubing.

4. The mobile charging gun expansion system according to claim 1, characterized in that: The speed of the electric chassis (7) is dynamically variable between 0 and 10 km / h, the turning radius is 3.6 meters, and the maximum climbing grade is 20%.

5. The mobile charging gun expansion system according to claim 1, characterized in that: The discharge rate of the lithium battery pack (1) is 0.5P-1P.

6. The conversion method of the mobile charging gun expansion system according to any one of claims 1 to 5, characterized in that: include: The number of charging guns is expanded, that is, the external charging gun (2) is connected through the expansion system and outputs independently through multiple charging guns (6); Expanding the power of the charging gun, based on the output power provided by the external charging gun (2), the expansion system provides additional output power for multiple charging guns (6) through the lithium battery pack (1); The charging gun interface is extended, that is, the interface of the charging gun (6) is adapted to the specification standard of the output requirement.

7. The conversion method of the mobile charging gun expansion system according to claim 6, characterized in that: The workflow for expanding the charging gun power is as follows: The lithium battery pack (1) and the charging gun input interface (3) connected to the external charging gun (2) are respectively supplied to the DC busbar (4), and then output to multiple control modules (5) through the DC busbar (4), and then output to the outside through multiple charging guns (6); The sum of the discharge power of the lithium battery pack (1) and the input power of the external charging gun (2) is equal to the sum of the output powers of the multiple charging guns (6), and the formula is as follows: P_in+P_bat1=P_out1+P_out2, In the formula, P_in is the input power of the external charging gun (2); P_bat1 is the discharge power of the lithium battery pack (1); P_out1 and P_out2 are the output powers of a single charging gun (6), respectively.

8. The conversion method of the mobile charging gun expansion system according to claim 7, characterized in that: When the output of the charging gun (6) is idle, the lithium battery pack (1) performs a charging operation, and the operation process is as follows: The external charging gun (2) is connected to the charging gun input interface (3), and then supplies power to the lithium battery pack (1) through the DC busbar (4); The charging power of the lithium battery pack (1) is equal to the input power of the external charging gun (2), and the formula is as follows: P_bat2=P_in, Wherein, P_bat2 is the charging power of the lithium battery pack (1), and P_in is the input power of the external charging gun (2).

9. The conversion method of the mobile charging gun expansion system according to claim 8, characterized in that: When the sum of the output powers of the multiple charging guns (6) is less than the rated input power of the external charging gun (2), the excess input power is used to supplement the power of the lithium battery pack (1). The supplementary power of the lithium battery pack (1) is equal to the input power of the external charging gun (2) minus the sum of the output powers of the multiple charging guns (6). The formula is as follows: P_bat2=P_in-(P_out1+P_out2), In the formula, P_bat2 is the charging power of the lithium battery pack (1), P_in is the input power of the external charging gun (2), and P_out1 and P_out2 are the output powers of a single charging gun (6) respectively.

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