Power distribution device of direct current charging pile

Abstract

The embodiment of the utility model provides a power distribution device of a direct current charging pile. The device comprises N charging module power pack groups, N direct current output ports and a plurality of direct current contactor groups, each direct current contactor group is composed of a positive pole direct current contactor and a negative pole direct current contactor, and N is an integer greater than 1; each charging module power pack group is connected between an alternating current power supply and a direct current output port; each charging module power pack group comprises a plurality of charging module power packs and a plurality of direct current contactor groups, and each charging module power pack is connected with the corresponding direct current contactor group; and a direct current contactor group is connected between two adjacent direct current output ports. According to the embodiment of the utility model, the power distribution flexibility of the direct current charging pile is improved while the cost of the direct current charging pile is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to power distribution circuit technical field especially relates to power distribution device of direct current charging pile. BACKGROUND

[0002] The existing high-power direct current charging pile is equipped with multiple output ports, and the direct current charging pile has a power distribution circuit inside to distribute power to each output port.

[0003] The power distribution circuit of the existing high-power direct current charging pile mainly has a matrix type power distribution circuit, a multi-path series power distribution circuit and a multi-dimensional power distribution circuit. The matrix type power distribution circuit uses DC contactors in parallel to realize power distribution between output loops. The multi-path series power distribution circuit uses DC contactors in series to realize power distribution between output loops. The multi-dimensional power distribution circuit uses multiple groups of DC contactors to connect N charging module power packs and N DC output ports. Each two DC output ports are connected by a group of DC contactors, and the number of required DC contactors is N*(N-1) / 2 groups.

[0004] The advantages and disadvantages of the above three power distribution circuits are as follows:

[0005] I) Matrix type power distribution circuit

[0006] The advantage is that the charging module power pack can be called arbitrarily to achieve full flexible power distribution. The disadvantage is that the number of DC contactors is large, resulting in high system cost, high system failure rate and complex control logic.

[0007] II) Multi-path series power distribution circuit

[0008] The advantage is that the power distribution function is realized to some extent, and the cost is lower than that of the matrix type power distribution circuit. The disadvantage is that it cannot achieve full flexible distribution, and the power distribution logic itself has defects.

[0009] III) Multi-dimensional power distribution circuit

[0010] The advantage is that the charging module power pack can be called arbitrarily to achieve full flexible power distribution. The disadvantage is that the number of DC output ports and charging module power packs is consistent, which is not suitable for scenarios where the number of DC output ports is less than the number of charging module power packs, and the number of DC contactors is large, resulting in high system cost. INVENTION CONTENTS

[0011] The power distribution device of the direct current charging pile is provided in the embodiment of the utility model to reduce the cost of the direct current charging pile while improving the flexibility of power distribution of the direct current charging pile.

[0012] The technical scheme of the embodiment of the utility model is realized as follows:

[0013] A power distribution device of a direct current charging pile, the device comprising: N charging module power package groups, N direct current output ports and a plurality of direct current contactor groups, each direct current contactor group consisting of a positive direct current contactor and a negative direct current contactor, N being an integer greater than 1, wherein:

[0014] Each charging module power package group is connected between an alternating current power supply and a direct current output port.

[0015] Each charging module power package group comprises a plurality of charging module power packages and a plurality of direct current contactor groups, wherein each charging module power package is connected with a direct current contactor group.

[0016] Between any two adjacent direct current output ports, a direct current contactor group is connected.

[0017] Each charging module power package is connected with a direct current contactor group, which is:

[0018] For any charging module power package, a positive direct current contactor is connected between the direct current positive port of the charging module power package and the direct current positive port of the direct current output port connected by the charging module power package group in which the charging module power package is located, and a negative direct current contactor is connected between the direct current negative port of the charging module power package and the direct current negative port of the direct current output port connected by the charging module power package group in which the charging module power package is located.

[0019] Between any two adjacent direct current output ports, a direct current contactor group is connected, which is:

[0020] For any two adjacent direct current output ports, a positive direct current contactor is connected between the direct current positive ports of the two direct current output ports, and a negative direct current contactor is connected between the direct current negative ports of the two direct current output ports.

[0021] When N≥3, the total number of direct current contactor groups contained in the device is: the sum of the total number of charging module power packages contained in the N charging module power package groups plus N-1.

[0022] A direct current contactor group is connected between the first direct current output port and the last direct current output port.

[0023] A direct current contactor group is connected between the first direct current output port and the last direct current output port, which is:

[0024] The positive direct current port of the first direct current output port and the positive direct current port of the last direct current output port are connected by a positive direct current contactor, and the negative direct current port of the first direct current output port and the negative direct current port of the last direct current output port are connected by a negative direct current contactor.

[0025] When N≥3, the total number of the direct current contactor groups contained by the device is the sum of the total number of the charging module power packs contained in the N charging module power pack groups plus N.

[0026] When N=2, the total number of the direct current contactor groups contained by the device is the sum of the total number of the charging module power packs contained in the two charging module power pack groups plus 1.

[0027] The device further comprises a charging controller, the charging controller having a communication port and a plurality of common port + outlet port groups, wherein each common port and outlet port in each common port + outlet port group has a switch therebetween;

[0028] The communication port of each charging module power pack is connected to the communication port of the charging controller;

[0029] The positive poles of the two magnetic attraction coils of each direct current contactor group are simultaneously connected to an outlet port of the charging controller, wherein the positive pole and the negative pole direct current contactor in each direct current contactor group correspond to a magnetic attraction coil respectively;

[0030] The negative poles of all the magnetic attraction coils are connected to the negative pole of the low-voltage direct current power supply;

[0031] All the common ports of the charging controller are connected to the positive pole of the low-voltage direct current power supply.

[0032] The communication port of the charging controller is:

[0033] The charging controller has a controller area network (CAN) communication port;

[0034] The communication port of each charging module power pack connected to the communication port of the charging controller is:

[0035] The CAN communication port of each charging module power pack is connected to the CAN communication port of the charging controller through a CAN bus.

[0036] The rated current of the direct current contactor connected to each charging module power pack is equal to the maximum output current of each charging module power pack.

[0037] In the above embodiments, the number of DC contactor groups in the DC charging pile is much smaller than the number of charging module power packs, which greatly reduces the cost of the DC charging pile; moreover, any charging module power pack can be called up arbitrarily within any charging module power pack group, and adjacent charging module power pack groups can be combined and called up in any number of combinations, which improves the flexibility of power allocation of the DC charging pile. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A schematic diagram of the power distribution device for a DC charging pile provided in an embodiment of this utility model;

[0040] Figure 2 For any charging module power package M xy With its charging module power pack M x Connected DC output port DO x The connection is made between KM and DC contactor group. xy +、KM xy - A schematic diagram of the connection;

[0041] Figure 3 For two adjacent DC output ports DO x and DO x+1 The connection is made between KM and DC contactor group. x +、KM x - A schematic diagram of the connection;

[0042] Figure 4 A schematic diagram of the power distribution device for a DC charging pile provided in another embodiment of the present invention;

[0043] Figure 5 A schematic diagram of the power distribution device for a high-power DC charging pile provided as an application example of this utility model;

[0044] Figure 6 A schematic diagram of the power distribution device for a DC charging pile provided in another embodiment of this utility model. Detailed Implementation

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0046] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not have to be used to describe a particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0047] Figure 1 The structural schematic diagram of the power distribution device of the direct current charging pile provided by an embodiment of the present application is shown in the figure. Figure 1 As shown in the figure, the device mainly comprises: N charging module power package groups (M1-M N ), N direct current output ports (DO1-DO N ) and a plurality of direct current contactor groups, each direct current contactor group is composed of a positive direct current contactor and a negative direct current contactor, N is an integer greater than 1, wherein:

[0048] I) Each charging module power package group is connected between an alternating current power supply and a direct current output port. As shown in the figure: Figure 1

[0049] The charging module power package group M1 is connected between the alternating current power supply and the direct current output port DO1;

[0050] The charging module power package group M2 is connected between the alternating current power supply and the direct current output port DO2;

[0051] ...

[0052] The charging module power package group M N is connected between the alternating current power supply and the direct current output port DO N .

[0053] ​ii) each charging module power pack group comprises a plurality of charging module power packs and a plurality of DC contactor groups, wherein each charging module power pack is connected with a DC contactor group respectively. Wherein the number of charging module power packs contained in any two charging module power pack groups can be the same or different. Figure 1

[0054] The charging module power pack group M1 contains P charging module power packs M 11 -M 1P and P DC contactor groups KM 11 -KM 1P (P>1), wherein M 11 and KM 11 are connected, M 12 and KM 12 are connected, …, M 1P and KM 1P are connected.

[0055] The charging module power pack group M2 contains Q charging module power packs M 21 -M 2Q and Q DC contactor groups KM 21 -KM 2Q (Q>1), wherein M 21 and KM 21 are connected, M 22 and KM 22 are connected, …, M 2Q and KM 2Q are connected.

[0056] ……

[0057] The charging module power pack group M N contains S charging module power packs M N1 -M NS and S DC contactor groups KM N1 -KM NS (S>1), wherein M N1 and KM N1 are connected, M N2 and KM N2 are connected, …, M NS and KM NS are connected.

[0058] ​Each charging module power pack is connected with a direct current contactor group, specifically, for any charging module power pack, the direct current positive port (DC+) of the charging module power pack is connected with the direct current positive port (DC+) of the direct current output port connected with the charging module power pack group where the charging module power pack is located through a positive direct current contactor, and the direct current negative port (DC-) of the charging module power pack is connected with the direct current negative port (DC-) of the direct current output port connected with the charging module power pack group where the charging module power pack is located through a negative direct current contactor.

[0059] Figure 2 Any charging module power pack M xy is connected with a direct current output port DO x connected with the charging module power pack group M x where the charging module power pack is located through a direct current contactor group KM xy +, KM xy -. xy The DC+ port of M xy is connected with the DC+ port of DO x through KM xy +, and the DC- port of M xy is connected with the DC- port of DO x through KM xy -. The L1, L2 and L3 ports of M x are respectively connected with three live lines of an alternating current power supply.

[0060] The rated current of the direct current contactor connected with each charging module power pack is equal to the maximum output current of each charging module power pack.

[0061] III) A direct current contactor group is connected between any two adjacent direct current output ports. As shown in Figure 1 :

[0062] A direct current contactor group KM x is connected between any two adjacent direct current output ports DO x and DO x+1 , 1≤x≤N-1. As shown in

[0063] A direct current contactor group KM1 is connected between the direct current output ports DO1 and DO2;

[0064] A direct current contactor group KM2 is connected between the direct current output ports DO2 and DO3;

[0065] …;

[0066] A direct current contactor group KM N-1 is connected between the direct current output ports DO N-1 and DO N ..

[0067] Similarly, for two adjacent DC output ports DO x and DO x+1 A positive DC contactor KM is connected between their DC positive terminals (DC+). x +, A negative DC contactor KM is connected between their DC negative terminals (DC-). x -;KM x + and KM x - Collectively referred to as KM x .

[0068] Figure 3 The two adjacent DC output ports DO are given. x and DO x+1 The connection is made through a DC contactor group KM x +、KM x - A schematic diagram of the connection, 1≤x≤N-1. Where DO x DC+ port via KM x + and DO x+1 DC+ port connection, DO x DC-port via KM x -with DO x+1 DC-port connection.

[0069] It is evident that, for Figure 1 For the device shown, when N≥3, the total number of DC contactor groups contained in the device is the sum of the total number of charging module power packs contained in the N charging module power pack groups plus N-1.

[0070] In the above embodiments, for any charging module power package M n (1≤n≤N), by default it is connected to the DC output port DO. n Become a DO n The inherent power packet group prioritizes responding to charging requests from this DC output port. That is, the charging module power packet group M1 is connected to the DC output port DO1 by default, becoming the inherent power packet group of DO1; the charging module power packet group M2 is connected to the DC output port DO2 by default, becoming the inherent power packet group of DO2; and so on.

[0071] When any DC output port DO n (1≤n≤N) When a device to be charged is connected, the power package M of the charging module is closed according to the charging power required by the device. n One or more DC contactor groups within; if M n If, after all DC contactor groups within the circuit are closed, the charging power required by the device to be charged is still insufficient, then in the DO circuit...n+1 or DO n-1 is idle (i.e. no device to be charged is connected), the DO n connected DC contactor group KM n or KM n-1 is closed, i.e. one of the following two operations is performed:

[0072] Operation one, when DO n+1 is idle, the DO n (1≤n≤N-1) and DO n+1 connected DC contactor group KM n is closed, and according to the requirement of the charging power of the device to be charged, one or more DC contactor groups in M n+1 are closed.

[0073] Operation two, when DO n-1 is idle, the DO n (2≤n≤N) and DO n-1 connected DC contactor group KM n-1 is closed, and according to the requirement of the charging power of the device to be charged, one or more DC contactor groups in M n-1 are closed.

[0074] If operation one is performed and all DC contactor groups in M n+1 are closed, but the charging power required by the device to be charged is still not met, then the DO n connected DC contactor group KM n-1 or DO n+1 connected DC contactor group KM n+1 is closed (it is required that DO n-1 or DO n+2 is idle);

[0075] If operation two is performed and all DC contactor groups in M n-1 are closed, but the charging power required by the device to be charged is still not met, then the DO n connected DC contactor group KM n or DO n-1 connected DC contactor group KM n-2 is closed (it is required that DO n+1 or DO n-2 is idle);

[0076] and so on, i.e. when the charging power requirement is not met, one DC contactor group (for connecting the DC output port) is closed to the left or right of the DC contactor group that has been closed at present until the charging power requirement is met. It should be noted that for DO1, it can only extend the closed DC contactor group to the right, and for DON It can only extend the closed DC contactor group to the left, for DO2~DO N-1 Then the closed DC contactor group can be expanded to the left and right sides.

[0077] It should be noted that the number N of the charging module power pack groups and the number of charging module power packs contained in each charging module power pack group can be set according to actual needs.

[0078] In the above embodiments, the number of DC contactor groups in the DC charging pile is much smaller than the number of charging module power packs, which greatly reduces the cost of the DC charging pile; moreover, any charging module power pack can be called up arbitrarily within any charging module power pack group, and adjacent charging module power pack groups can be combined and called up in any number of combinations, which improves the flexibility of power allocation of the DC charging pile.

[0079] Figure 4 This is a schematic diagram of the power distribution device for a DC charging pile according to another embodiment of the present invention. Figure 4 As shown, the device is with Figure 1 The only difference between the devices shown is in the first DC output port DO1 and the last DC output port DO. N A DC contactor group KM was added between them. N .

[0080] It is evident that, for Figure 4 The device shown, when N≥3, contains a total number of DC contactor groups: the sum of the total number of charging module power packs in the N charging module power pack groups plus N.

[0081] It can also be seen that, whether Figure 1 The device shown is still Figure 4 The device shown, when N=2, has a total number of DC contactor groups in both devices that is the sum of the total number of charging module power packs in the two charging module power pack groups plus 1.

[0082] Figure 4 Compared to the device shown Figure 1 The advantage of the device shown is that when a device to be charged is connected to DO1, and the charging power required by the device is still insufficient after closing all DC contactor groups in M1, not only can KM1 be closed, but KM can also be closed. N Closed; similarly, when DO N A device to be charged is connected, and M is... N If, after closing all DC contactor groups within the circuit, the required charging power for the device to be charged is still insufficient, then KM can be selected. N-1 Alternatively, you can choose to close KM. NClosed. That is, for the device shown in Fig. 1, for DO1, it can only expand the closed DC contactor group to the right side; for DO2, it can only expand the closed DC contactor group to the left side; and for the device shown in Fig. 2, for DO1 and DO2, both can expand the closed DC contactor group to the left and right sides. Figure 1 N Figure 4 N

[0083] Figure 5 The structure diagram of the power distribution device of the high-power DC charging pile is provided in an application example of the utility model. As shown in Fig. 3, in the application example, the DC output port has two: DO1 and DO2, and correspondingly, the charging module power package group has two groups: M1 and M2. M1 contains three charging module power packages M1, M2 and M3 and three DC contactor groups KM1, KM2 and KM3; M2 contains three charging module power packages M4, M5 and M6 and three DC contactor groups KM4, KM5 and KM6. Figure 5 11 12 13 11 12 13 21 22 23 21 22 23

[0084] As shown in Fig. 4, by default, M1 accesses the DC output port DO1 and becomes the inherent power package group of DO1; by default, M2 accesses the DC output port DO2 and becomes the inherent power package group of DO2. Figure 5

[0085] When DO1 accesses the to-be-charged device, according to the charging power required by the to-be-charged device, one group or two groups or all of the DC contactor groups in M1 are closed; if all the DC contactor groups in M1 are closed, the charging power required by the to-be-charged device is still not met, then KM1 is closed, and one group or two groups or all of the DC contactor groups in M2 are closed to meet the charging power requirement.

[0086] Similarly, when DO2 accesses the to-be-charged device, according to the charging power required by the to-be-charged device, one group or two groups or all of the DC contactor groups in M2 are closed; if all the DC contactor groups in M2 are closed, the charging power required by the to-be-charged device is still not met, then KM1 is closed, and one group or two groups or all of the DC contactor groups in M1 are closed to meet the charging power requirement.

[0087] Figure 6 ​​​​​​​​​​​​​​​​​​This is a schematic diagram of the power distribution device for a DC charging pile, provided in another embodiment of the present invention. Figure 6 As shown, the device is with Figure 1 Compared to the device shown, a charging controller is added, and the charging controller has a communication port and multiple COM (common) port + NO (output) port groups, with a switch between the COM port and the NO port in each COM port + NO port group;

[0088] in:

[0089] 1) The communication port of each charging module power pack is connected to the communication port of the charging controller.

[0090] In practical applications, the communication port can be a CAN (Controller Area Network) communication port. Correspondingly, the CAN communication port of each charging module's power pack is connected to the CAN communication port of the charging controller via a CAN bus.

[0091] (ii) The DC contactor group in the power distribution device of the DC charging pile corresponds uniquely to a COM port + NO port group in the charging controller. Furthermore, the positive poles of the two magnetic coils in each DC contactor group are simultaneously connected to a NO port of the charging controller. In this case, the positive and negative DC contactors in each DC contactor group correspond to a magnetic coil.

[0092] The function of the magnetic coil is to generate a magnetic field when current flows through it, causing the movable metal contacts of the DC contactor to move, thus closing the DC contactor. Since each DC contactor group contains two DC contactors: a positive DC contactor and a negative DC contactor, each positive and negative DC contactor corresponds to a magnetic coil. Because the two DC contactors in the same group need to close or open simultaneously, the positive terminals of the two magnetic coils corresponding to the two DC contactors in the same group must be connected simultaneously to the same NO port on the charging controller.

[0093] like Figure 6 As shown:

[0094] DC contactor group KM 11 The positive terminal of the magnetic coil is connected to NO. 11 Port (It should be noted that, since KM is used here) 11 This represents a combination of a positive DC contactor and a negative DC contactor; therefore, KM 11 The right side shows only a small rectangle representing a magnetic coil. In practical applications, the positive DC contactor and the negative contactor each correspond to a magnetic coil, and the positive terminals of these two magnetic coils are simultaneously connected to NO. 11 port);

[0095] KM 12 positive pole of the magnetic attraction coil of KM is connected to NO 12 port;

[0096] …;

[0097] KM NS positive pole of the magnetic attraction coil of KM is connected to NO NS port;

[0098] positive pole of the magnetic attraction coil of KM1 is connected to NO1 port;

[0099] positive pole of the magnetic attraction coil of KM2 is connected to NO2 port;

[0100] …;

[0101] KM N-1 positive pole of the magnetic attraction coil of KM is connected to NO N-1 port.

[0102] IV) Negative poles of all magnetic attraction coils are connected to negative pole of low-voltage DC power supply.

[0103] In practical application, the negative pole of the low-voltage DC power supply can be -12V.

[0104] IV) All COM ports of the charge controller are connected to positive pole of low-voltage DC power supply.

[0105] In practical application, the positive pole of the low-voltage DC power supply can be +12V.

[0106] As shown in Figure 6 , when a DC contactor group is to be closed, the switch connected to the NO port to which the positive pole of the magnetic attraction coil corresponding to the DC contactor group is connected is closed, at this time, since the switch is closed, there is current from the positive pole of the low-voltage DC power supply through the COM port to the NO port and then to the magnetic attraction coil, so that the magnetic attraction coil generates a magnetic field, attracting the movable metal contact of the DC contactor group to move in the direction of the magnetic attraction coil, that is, making the DC contactor group closed.

[0107] Among them, the charge controller determines which DC contactor groups need to be closed, which belongs to mature technology. For example: the charge controller calculates the required charging power according to the required charging voltage and charging current of the equipment to be charged, and then divides the required charging power by the rated power of a single charging module power pack to calculate the number of charging module power packs required, thereby determining which DC contactor groups need to be closed. Then, the charge controller interacts with the charging module power pack used this time through the CAN bus to control each charging module power pack to output voltage and current matching the required charging voltage and charging current.

[0108] When the DC contactor group KM N is connected between the DC output ports DO1 and DO N , at this time only need to connect the positive pole of the corresponding magnetic attraction coil to the NO N port of the charge controller, and at the same time connect the negative pole of the magnetic attraction coil to the negative pole of the low-voltage DC power supply. N

[0109] Those skilled in the art can understand that the features described in various embodiments and / or claims of the present disclosure can be combined and / or combined in various combinations, even if such combinations or combinations are not explicitly described in the present application. In particular, the features described in various embodiments and / or claims of the present application can be combined and / or combined in various combinations without departing from the spirit and teachings of the present application, and all such combinations and / or combinations fall within the scope of the present disclosure.

[0110] The principles and implementation modes of the present application are described in the specific embodiments herein, and the above embodiment descriptions are only used to help understand the core idea of the present application, and are not used to limit the present application. For those skilled in the art, according to the idea, spirit and principles of the present application, changes can be made in the specific implementation mode and application range, and any modification, equivalent replacement, improvement, etc. made by them shall be included in the scope of protection of the present application.​

Claims

1. A power distribution device for a direct current charging station, characterized in that, The device comprises N charging module power pack groups, N DC output ports and multiple DC contactor groups, each DC contactor group is composed of a positive DC contactor and a negative DC contactor, N is an integer greater than 1, wherein: Each charging module power pack group is connected between an AC power supply and a DC output port; Each charging module power pack group comprises multiple charging module power packs and multiple DC contactor groups, wherein each charging module power pack is connected with a DC contactor group; Between any two adjacent DC output ports, a DC contactor group is connected.

2. The apparatus of claim 1, wherein, Each charging module power pack is connected with a DC contactor group, which is: For any charging module power pack, a positive DC contactor is connected between the DC positive port of the charging module power pack and the DC positive port of the DC output port connected by the charging module power pack group in which the charging module power pack is located, and a negative DC contactor is connected between the DC negative port of the charging module power pack and the DC negative port of the DC output port connected by the charging module power pack group in which the charging module power pack is located; Between any two adjacent DC output ports, a DC contactor group is connected. For any two adjacent DC output ports, a positive DC contactor is connected between the DC positive ports of the two DC output ports, and a negative DC contactor is connected between the DC negative ports of the two DC output ports.

3. The apparatus of claim 2, wherein, When N≥3, the total number of DC contactor groups contained in the device is: the sum of the total number of charging module power packs contained in the N charging module power pack groups plus N-1.

4. The apparatus of claim 1, wherein, A DC contactor group is connected between the first DC output port and the last DC output port.

5. The apparatus of claim 4, wherein, A DC contactor group is connected between the first DC output port and the last DC output port, which is: A positive DC contactor is connected between the DC positive port of the first DC output port and the DC positive port of the last DC output port, and a negative DC contactor is connected between the DC negative port of the first DC output port and the DC negative port of the last DC output port.

6. The apparatus of claim 4, wherein, When N≥3, the total number of DC contactor groups contained in the device is: the sum of the total number of charging module power packs contained in the N charging module power pack groups plus N.

7. The apparatus of claim 2 or 4, wherein, When N=2, the total number of DC contactor groups contained in the device is: the sum of the total number of charging module power packs contained in the two charging module power pack groups plus 1.

8. The apparatus of claim 1, wherein, The device further comprises a charging controller, the charging controller has a communication port and multiple common port + outlet port groups, wherein each common port and outlet port in each common port + outlet port group has a switch; The communication port of each charging module power pack is connected with the communication port of the charging controller; The positive poles of the two magnetic attraction coils of each DC contactor group are connected with an outlet port of the charging controller at the same time, wherein the positive and negative DC contactors in each DC contactor group correspond to a magnetic attraction coil respectively; The negative poles of all magnetic attraction coils are connected to the negative pole of a low-voltage DC power supply; All common ports of the charge controller are connected to the positive pole of the low-voltage DC power supply.

9. The apparatus of claim 8, wherein, The charge controller has a communication port, which is: The charge controller has a controller area network (CAN) communication port; The communication port of each charge module power pack is connected to the communication port of the charge controller, which is: The CAN communication port of each charge module power pack is connected to the CAN communication port of the charge controller through a CAN bus.

10. The apparatus of claim 1, wherein, The rated current of the DC contactor connected to each charge module power pack is equal to the maximum output current of each charge module power pack.

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