Charging pile

Abstract

The invention relates to a charging pile, which comprises a plurality of first and second power modules, a plurality of first and second charging connection ends, a plurality of bus tie switches, a first switching unit, a second switching unit and a controller, the plurality of second power modules and the plurality of first power modules are connected in a one-to-one correspondence manner; the first switching unit is connected with all the first power modules and all the first charging connection ends; the second switching unit is connected with all the second power modules and all the second charging connecting ends; the first charging connection ends and the second charging connection ends are connected in a one-to-one correspondence mode through the bus tie switches. The controller is used for obtaining a working mode of the charging pile; and according to the working mode of the charging pile, the states of the first switching unit, the second switching unit and the bus tie switch are controlled so as to adjust the power output of the first charging connection end and / or the second charging connection end. According to the invention, a plurality of different working modes of the charging pile can be realized so as to meet different application scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of charging stacks, and more particularly to a charging stack. Background Art

[0002] With the increasing popularity of electric vehicles, the demand for charging infrastructure, a key enabler of their application, is growing. As the number of application scenarios continues to expand, the functional requirements for charging equipment are also becoming increasingly diverse. Building charging infrastructure that meets the needs of these diverse scenarios is a crucial task in promoting the development of electric vehicles. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a charging stack in view of some of the above technical defects of the prior art.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a charging stack, including: a plurality of first power modules, a plurality of second power modules, a plurality of first charging connection terminals, a plurality of second charging connection terminals and a plurality of bus tie switches, as well as a first switching unit, a second switching unit and a controller;

[0005] The plurality of second power modules form a one-to-one connection relationship with the plurality of first power modules and provide power input through the corresponding first power modules;

[0006] The first switching unit is connected to all the first power modules and all the first charging connection terminals, and is used to switch the conduction state between the first charging connection terminals and the first power modules;

[0007] The second switching unit is connected to all the second power modules and all the second charging connection terminals, and is used to switch the conduction state between the second charging connection terminals and the second power modules;

[0008] The plurality of first charging connection terminals and the plurality of second charging connection terminals are connected in a one-to-one correspondence via the plurality of bus tie switches;

[0009] The controller is used to:

[0010] Obtaining an operating mode of the charging stack;

[0011] According to the working mode of the charging stack, the states of the first switching unit, the second switching unit and the bus tie switch are controlled to adjust the power output of the first charging connection end and / or the second charging connection end.

[0012] In an embodiment of the charging stack of the present invention, the controller is further configured to:

[0013] When the charging stack is in a first operating mode, obtaining operating states of the first charging connection terminal and the second charging connection terminal;

[0014] The states of the first switching unit, the second switching unit, and the bus tie switch are controlled according to the working states of the first charging connection terminal and the second charging connection terminal to adjust the power output of the first charging connection terminal and / or the second charging connection terminal.

[0015] In an embodiment of the charging stack of the present invention, the controller is further configured to:

[0016] When only the first charging connection end is in the charging output state,

[0017] controlling the first switching unit to allocate at least one first power module to the first charging connection end, and controlling the second switching unit and the bus tie switch to remain off;

[0018] When there are remaining first power modules, the remaining first power modules are allocated according to the charging requirements of the first charging connection end.

[0019] In an embodiment of the charging stack of the present invention, the controller is further configured to:

[0020] When only the second charging connection terminal is in the charging output state,

[0021] controlling the first switching unit and the bus tie switch to allocate at least one first power module to each second charging connection end, and controlling the second switching unit to remain off;

[0022] When there are remaining first power modules, the remaining first power modules are allocated according to the charging demand of the second charging connection end.

[0023] In an embodiment of the charging stack of the present invention, the controller is further configured to:

[0024] When the actual output power of the first charging connection end or the second charging connection end is less than the target output power, confirming the working status of all first power modules and obtaining a partially loaded first power module;

[0025] The second switching unit and the bus tie switch are switched so that the partially loaded first power module supplies power to the first charging connection terminal or the second charging connection terminal through the corresponding second power module.

[0026] In an embodiment of the charging stack of the present invention, the controller is further configured to:

[0027] When both the first charging connection terminal and the second charging connection terminal are in the charging output state,

[0028] controlling the first switching unit to allocate at least one first power module to each first charging connection end;

[0029] confirming whether a first charging connection terminal corresponding to the second charging connection terminal is in a charging output state;

[0030] If yes, controlling the second switching unit so that the second charging connection end is powered by a target second power module, wherein the target second power module is a second power module corresponding to the first power module allocated to the first charging connection end;

[0031] If not, the bus tie switch and the first switching unit are controlled to allocate at least one first power module to the second charging connection end.

[0032] In an embodiment of the charging stack of the present invention, the controller is further configured to:

[0033] When all first charging connection terminals and all second charging connection terminals are in the charging output state,

[0034] The first switching unit and the second switching unit are controlled so that the first power module supplies power to the corresponding first charging connection end through the first switching unit, and supplies power to the second charging connection end through the second power module and the second switching unit.

[0035] In an embodiment of the charging stack of the present invention, the controller is further configured to:

[0036] When the charging stack is in the second operating mode, determining a connection status between a discharge device and the first charging connection terminal and the second charging connection terminal, wherein the discharge device is configured to provide power input through the first charging connection terminal or the second charging connection terminal;

[0037] The states of the first switching unit, the second switching unit, and the bus tie switch are controlled according to the connection states of the discharge device with the first charging connection terminal and the second charging connection terminal to adjust the power output of the first charging connection terminal and / or the second charging connection terminal.

[0038] In an embodiment of the charging stack of the present invention, the controller is further configured to:

[0039] When the discharging device is connected to the first charging connection end, obtaining a second power module in an idle state;

[0040] The power output of the first power module corresponding to the second power module is turned off, and the first switching unit is controlled so that the discharge device supplies power to the second power module, and the second switching unit and the bus tie switch are controlled so that the second power module supplies power to the first charging connection terminal or the second charging connection terminal.

[0041] In an embodiment of the charging stack of the present invention, the controller is further configured to:

[0042] When the discharge device is connected to the second charging connection terminal, confirming the working status of the first charging connection terminal corresponding to the second charging connection terminal;

[0043] When the first charging connection end is in an idle state, obtaining a second power module in an idle state, and shutting down the power output of the first power module corresponding to the second power module;

[0044] The bus tie switch and the first switching unit are controlled so that the discharge device supplies power to the second power module, and the second switching unit and the bus tie switch are controlled so that the second power module supplies power to the first charging connection terminal or the second charging connection terminal.

[0045] A charging stack implementing the present invention has the following beneficial effects: it can realize multiple working modes of the charging stack to meet different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0047] Figure 1 This is a schematic structural diagram of an embodiment of a charging stack according to the present invention;

[0048] Figure 2 This is a program flow chart of an embodiment of a working process of a controller in a charging stack of the present invention;

[0049] Figure 3 This is a program flow chart of an embodiment of a working process of a controller in a charging stack of the present invention;

[0050] Figure 4 This is a program flow chart of an embodiment of a working process of a controller in a charging stack of the present invention;

[0051] Figure 5 This is a program flow chart of an embodiment of a working process of a controller in a charging stack of the present invention;

[0052] Figure 6 This is a program flow chart of an embodiment of a working process of a controller in a charging stack of the present invention;

[0053] Figure 7 This is a program flow chart of an embodiment of a working process of a controller in a charging stack of the present invention;

[0054] Figure 8 This is a program flow chart of an embodiment of a working process of a controller in a charging stack of the present invention;

[0055] Figure 9 This is a program flow chart of an embodiment of a working process of a controller in a charging stack of the present invention;

[0056] Figure 10 This is a schematic diagram of current flow during a working process in a charging stack of the present invention;

[0057] Figure 11 This is a schematic diagram of current flow during a working process in a charging stack of the present invention;

[0058] Figure 12 It is a schematic diagram of current flow during a working process in a charging stack of the present invention. DETAILED DESCRIPTION

[0059] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0060] like Figure 1 FIG. 1 shows an embodiment of a charging stack of the present invention. Figure 1 In an embodiment of a charging stack of the present invention shown, the charging stack includes: a plurality of first power modules 111, a plurality of second power modules 112, a plurality of first charging connection terminals 141, a plurality of second charging connection terminals 142 and a plurality of bus-tie switches 130, as well as a first switching unit 121, a second switching unit 122 and a controller; the plurality of second power modules 112 form a one-to-one connection relationship with the plurality of first power modules 111 and provide power input through the corresponding first power modules 111; the first switching unit 121 connects all the first power modules 111 and all the first charging connection terminals 141, and is used to switch the conduction state between the first charging connection terminals 141 and the first power modules 111; the second switching unit 122 connects all the second power modules 112 and all the second charging connection terminals 142, and is used to switch the conduction state between the second charging connection terminals 142 and the second power modules 112; the plurality of first charging connection terminals 141 and the plurality of second charging connection terminals 142 form a one-to-one connection relationship through the plurality of bus-tie switches 130. Among them, the controller in the charging stack is used to perform the following steps: S1, obtain the working mode of the charging stack; S2, control the status of the first switching unit 121, the second switching unit 122 and the main switch 130 according to the working mode of the charging stack to adjust the power output of the first charging connection terminal 141 and / or the second charging connection terminal 142.

[0061] Specifically, the first power module 111 is configured to receive an external power input, such as a 380V AC input, perform power conversion, and then provide a power output. The first power module 111 is connected to the first charging connector 141 via a first switching unit 121. Controlling the first switching unit 121 allows for electrical connection between a selected first charging connector 141 and the selected first power module 111. This selective electrical connection operation can be understood as assigning the selected first power module 111 to the selected first charging connector 141 via the first switching unit 121. The number of first power modules 111 is greater than or equal to the number of first charging connectors 141. This ensures that when all first charging connectors 141 are connected to a charging device, each first charging connector 141 can be individually assigned to a first power module 111 via the first switching unit 121. Each first power module 111 may include one or more power modules to achieve the desired power output. The second power module 112 is connected to the first power module 111 in a one-to-one correspondence. The first power module 111 can serve as the power input for the corresponding second power module 112. Because the first charging connection terminals 141 and the second charging connection terminals 142 are connected in a one-to-one correspondence via the bus tie switch 130, it can be understood that the number of second charging connection terminals 142 is the same as the number of first charging connection terminals 141, and the number of second power modules 112 is the same as the number of first power modules 111. Therefore, the number of second power modules 112 can also be greater than or equal to the number of second charging connection terminals 142. In one specific embodiment, the number of first power modules 111, first charging connection terminals 141, second power modules 112, and second charging connection terminals 142 can be the same. In one embodiment, the first power module 111 can include several AC / DC modules to convert AC to DC, for example, converting AC from the mains into DC output. The second power module 112 can include a DC / DC module to convert DC to DC, for example, further converting the DC output of the first power module to the required DC output.

[0062] In the charging stack, the working process of the charging stack is controlled by the controller. Figure 2As shown, when the charging stack is set to different operating modes, the controller controls the first switching unit 121, the second switching unit 122, and the bus tie switch 130 according to the charging stack operating mode. For example, when the charging stack is in G2V (Grid-to-Vehicle) mode, the power output of the first charging connector 141 and the second charging connector 142 can be controlled by switching the first switching unit 121, the second switching unit 122, and the bus tie switch 130. It should be emphasized that controlling the power output of the first charging connector 141 and the second charging connector 142 primarily adjusts the power output of the first charging connector 141 and the second charging connector 142 when in the charging output state. The first charging connector 141 and the second charging connector 142 are only considered to be in the charging output state when they are connected to a charging device and providing power to the charging device. During the specific power adjustment process, the states of the first switching unit 121, the second switching unit 122, and the bus tie switch 130 are switched to select one or more of the first power module 111 and the second power module 112 to provide input power to the first charging connection terminal 141 and the second charging connection terminal 142. It will be understood that the output power of the first charging connection terminal 141 and the second charging connection terminal 142 is provided directly or indirectly through the input of the first power module 111.

[0063] When the charging stack is in V2V (Vehicle-to-Vehicle) mode, the first switching unit 121, the second switching unit 122, and the bus tie switch 130 need to be switched so that the first charging connection terminal 141 or the second charging connection terminal 142 connected to the discharge device can provide power input to the first charging connection terminal 141 or the second charging connection terminal 142 in the charging output state. It will be understood that in one embodiment, the output power of the first charging connection terminal 141 and the second charging connection terminal 142 can both be indirectly provided by the discharge device. In this case, the first power module 111 does not need to participate in the distribution of the first charging connection terminal 141 and the second charging connection terminal 142. In one embodiment, the first charging connection terminal 141 and the second charging connection terminal 142 can be directly or indirectly provided by the discharge device and the input of the first power module 111. That is, by switching the states of the first switching unit 121, the second switching unit 122 and the busbar switch 130, one or more of the appropriate first power modules 111 and the second power modules 112 can be selected to provide power input to the first charging connection terminal 141 and the second charging connection terminal 142 in the charging output state together with the discharge device.

[0064] The process of adjusting the output power of the first charging connection terminal 141 and the second charging connection terminal 142 may also include turning off the first charging connection terminal 141 and the second charging connection terminal 142 in an idle state to achieve zero power output.

[0065] In one embodiment, if Figure 3 As shown, the controller is also used to perform the following steps: S11, when the charging stack is in the first working mode, obtain the working status of the first charging connection terminal 141 and the second charging connection terminal 142; S12, according to the working status of the first charging connection terminal 141 and the second charging connection terminal 142, control the status of the first switching unit 121, the second switching unit 122 and the main switch 130 to adjust the power output of the first charging connection terminal 141 and / or the second charging connection terminal 142.

[0066] Specifically, when the charging stack is set to the first operating mode, it corresponds to a G2V (Grid-to-Vehicle) mode. At this time, all first charging connectors 141 and second charging connectors 142 of the charging stack are configured to only output power. The first switching unit 121, the second switching unit 122, and the bus tie switch 130 are then controlled based on the connection status between the charging device and the first charging connectors 141 and second charging connectors 142, so that the first charging connectors 141 and second charging connectors 142 in the charging output state can achieve the corresponding power output. This process also includes the allocation of the first power modules 111, that is, allocating the appropriate first power modules 111 to the corresponding first charging connectors 141 and second charging connectors 142.

[0067] In one embodiment, if Figure 4 As shown, the controller is also used to perform the following steps: S11a, when only the first charging connection terminal 141 is in the charging output state, controlling the first switching unit 121 to allocate at least one first power module 111 to the first charging connection terminal 141, and controlling the second switching unit 122 and the bus tie switch 130 to remain off; S12a, when there are remaining first power modules 111, allocating the remaining first power modules 111 according to the charging requirements of the first charging connection terminal 141.

[0068] Specifically, when only the first charging connection 141 of the charging stack is connected to a charging device and is set to a charging output state, the controller controls the first switching unit 121 to switch, so that at least one first power module 111 is assigned to the first charging connection 141. The assigned first power module 111 provides power input to the first charging connection 141 through the first switching unit 121. During this time, the second power module 112 does not participate in operation, and the second switching unit 122 and the bus tie switch 130 are turned off. If the number of occupied first charging connection terminals 141 is less than the number of first power modules 111, that is, if there are still first power modules 111 remaining after allocating first power modules 111 to the first charging connection terminals 141, the remaining first power modules 111 can be further allocated based on the charging needs of the first charging connection terminals 141, thereby selecting a first power module 111 to be assigned to the first charging connection terminals 141.

[0069] Further, such as Figure 4 As shown, the controller is further used to perform the following steps: S13a, when the actual output power of the first charging connection terminal 141 is less than the target output power, confirm the working status of all first power modules 111 and obtain the non-fully loaded first power module 111; S14a, switch the second switching unit 122 and the bus tie switch 130, so that the non-fully loaded first power module 111 supplies power to the first charging connection terminal 141 or the second charging connection terminal 142 through the corresponding second power module 112.

[0070] Specifically, the target output power corresponding to the first charging connection terminal 141 is obtained based on the charging demand of the charging device connected to the first charging connection terminal 141. When the actual output power of the first charging connection terminal 141 does not meet the target output power requirement, the operating status of all first power modules 111 is determined based on the target output power of all first charging connection terminals 141, that is, whether there are first power modules 111 operating at less than full load, and the less-full-loaded first power modules 111 are obtained. The controller controls the second switching unit 122 and the bus tie switch 130 to convert the remaining power of the less-full-loaded first power modules 111 through the second power module 112, and then switch the remaining power to the corresponding bus tie switch 130 through the second switching unit 122, so that the bus tie switch 130 can supply power to the first charging connection terminal 141.

[0071] In one embodiment, if Figure 5As shown, the controller is further used to perform the following steps: S11b, when only the second charging connection terminal 142 is in the charging output state, controlling the first switching unit 121 and the bus switch 130 to allocate at least one first power module 111 to each second charging connection terminal 142, and controlling the second switching unit 122 to remain turned off; S12b, when there are remaining first power modules 111, allocating the remaining first power modules 111 according to the charging requirements of the second charging connection terminal 142.

[0072] Specifically, when only the second charging connection 142 of the charging stack is connected to a charging device and is set to a charging output state, the controller controls the first switching unit 121 and the bus tie switch 130 to allocate at least one first power module 111 to the second charging connection 142. The allocated first power module 111 then provides power to the second charging connection 142 via the first switching unit 121 and the bus tie switch 130 corresponding to the second charging connection 142. During this time, the second power modules 112 are not operational, and the second switching unit 122 is turned off. If the number of occupied second charging connection 142 is less than the total number of second power modules 112, that is, if there are still remaining first power modules 111 after allocating first power modules 111 to the second charging connection 142, the remaining first power modules 111 can be allocated based on the charging needs of the second charging connection 142, and the remaining first power modules 111 can be allocated to the required second charging connection 142. During the specific operation, by switching the first switching unit 121 , the remaining first power modules 111 can be input to the corresponding second charging connection terminals 142 through the bus tie switch 130 .

[0073] Further, such as Figure 5 As shown, the controller is also used to perform the following steps: S13b, when the actual output power of the second charging connection terminal 142 is less than the target output power, confirm the working status of all first power modules 111 and obtain the non-fully loaded first power module 111; S14b, switch the second switching unit 122 and the busbar switch 130, so that the non-fully loaded first power module 111 supplies power to the second charging connection terminal 142 through the corresponding second power module 112.

[0074] Specifically, the target output power corresponding to the second charging connection terminal 142 is obtained based on the charging demand of the charging device connected to the second charging connection terminal 142. When the actual output power of the second charging connection terminal 142 does not meet the target output power requirement, the operating status of all first power modules 111 is confirmed based on the target output power of all second charging connection terminals 142, that is, whether there are first power modules 111 operating at less than full load, and the less than full load first power modules 111 are obtained. The second switching unit 122 and the bus tie switch 130 are controlled to convert the remaining power of the less than full load first power modules 111 through the second power module 112 and switch it to the corresponding second charging connection terminal 142 through the second switching unit 122 to supply power to it.

[0075] In one embodiment, if Figure 6 As shown, the controller is further configured to perform the following steps: S11c, when both the first charging connection terminal 141 and the second charging connection terminal 142 are in the charging output state, controlling the first switching unit 121 to allocate at least one first power module 111 to each first charging connection terminal 141; S12c, confirming whether the first charging connection terminal 141 corresponding to the second charging connection terminal 142 is in the charging output state; S13c, if so, controlling the second switching unit 122 to enable the second charging connection terminal 142 to be powered by the target second power module 112, wherein the target second power module 112 is the second power module 112 corresponding to the first power module 111 allocated to the first charging connection terminal 141; S14c, if not, controlling the bus tie switch 130 and the first switching unit 121 to allocate at least one first power module 111 to the second charging connection terminal 142.

[0076] Specifically, when both the first charging connection 141 and the second charging connection 142 are connected to charging devices and are performing charging output, the first switching unit 121 firstly allocates a first power module 111 to the first charging connection 141, ensuring that each first charging connection 141 (the first charging connection 141 performing charging output) is allocated at least one first power module 111. The first charging connection 141 connected to the second charging connection 142 (the second charging connection 142 performing charging output) via the bus tie switch 130 is then determined to be occupied, i.e., in the charging output state. If the first charging connection 141 is in the charging output state, the corresponding bus tie switch 130 remains closed, and the second power module 112 connected to the first power module 111 corresponding to the first charging connection 141 is selected as the target second power module 112, and power is supplied to the second charging connection 142 via the target second power module 112. When the first charging connection terminal 141 is not in a charging output state, that is, the first charging connection terminal 141 is not occupied, the bus tie switch 130 and the first switching unit 121 can be directly controlled to allocate at least one first power module 111 to the second charging connection terminal 142 connected to the first charging connection terminal 141 through the bus tie switch 130.

[0077] In one embodiment, the controller is further configured to perform the following steps: when all first charging connection terminals 141 and all second charging connection terminals 142 are in a charging output state, controlling the first switching unit 121 and the second switching unit 122 so that the first power module 111 supplies power to the corresponding first charging connection terminal 141 through the first switching unit 121, and supplies power to the second charging connection terminal 142 through the second power module 112 and the second switching unit 122.

[0078] Specifically, when all first charging terminals 141 and all second charging terminals 142 are connected to charging devices and are providing charging output, the first switching unit 121 and the second switching unit 122 can be controlled so that the first power module 111 can simultaneously supply power to the first charging terminals 141 via the first switching unit 121 and also supply power to the second charging terminals 142 via the second power module 112 and the second switching unit 122. At this time, the bus tie switch 130 is in the off state. In one specific embodiment, the first charging terminals 141 and the second charging terminals 142 corresponding to the same first power module 111 (indirectly corresponding to each other through the second power module 112) can be set as the first charging terminals 141 and the second charging terminals 142 connected via the bus tie switch 130.

[0079] In one embodiment, if Figure 7As shown, the controller is further used to perform the following steps: S21, when the charging stack is in the second working mode, determine the connection status between the discharge device and the first charging connection terminal 141 and the second charging connection terminal 142, wherein the discharge device is used to provide power input through the first charging connection terminal 141 or the second charging connection terminal 142; S22, according to the connection status of the discharge device and the first charging connection terminal 141 and the second charging connection terminal 142, control the status of the first switching unit 121, the second switching unit 122 and the busbar switch 130 to adjust the power output of the first charging connection terminal 141 and / or the second charging connection terminal 142.

[0080] Specifically, when the charging stack is set to the second operating mode, the charging stack operates in V2V (Vehicle-to-Vehicle) mode. In this case, the charging stack has a first charging connector 141 or a second charging connector 142 connected to a discharging device. That is, the discharging device can provide power input to the other first charging connector 141 or second charging connector 142 via the connected first charging connector 141 or second charging connector 142. During operation, the first switching unit 121, the second switching unit 122, and the bus tie switch 130 can be controlled based on the connection status between the discharging device and the first charging connector 141 or second charging connector 142, as well as the connection status between the charging device and the first charging connector 141 or second charging connector 142, so that the corresponding first charging connector 141 or second charging connector 142 can achieve the corresponding power output. This effectively includes the power input of the discharging device in the power distribution between the first charging connector 141 and the second charging connector 142.

[0081] In one embodiment, if Figure 8 As shown, the controller is further used to perform the following steps: S21a, when the discharge device is connected to the first charging connection terminal 141, obtain the second power module 112 in the idle state; S22a, shut down the power output of the first power module 111 corresponding to the second power module 112, and control the first switching unit 121 so that the discharge device supplies power to the second power module 112, and control the second switching unit 122 and the bus tie switch 130 so that the second power module 112 supplies power to the first charging connection terminal 141 or the second charging connection terminal 142.

[0082] Specifically, when the discharge device provides power input to the charging stack via the first charging connection 141, the operating status of all second power modules 112 is determined, and the second power modules 112 that are in an idle state are identified. At this point, an idle second power module 112 can be understood as an unoccupied second power module 112. The power output of the first power module 111 corresponding to the second power module 112 is shut off. It is understood that when the first power module 111 is outputting power, the power output of the first power module 111 must first be shut off. At this point, the discharge device provides power input to the second power module 112 via the first switching unit 121. Then, based on the charging needs of the charging device, the second switching unit 122 and the bus tie switch 130 are controlled so that the second power module 112 participates in the power output distribution between the first charging connection 141 and the second charging connection 142. It is understood that there may be one or more discharge devices. When there are multiple discharge devices, this is equivalent to having multiple first charging connectors 141 connected to the discharge devices. Each first charging connector 141 performs the above operation to power the idle second power modules 112. In one embodiment, each second power module 112 is powered by one of the first charging connectors 141. In one embodiment, the same first charging connector 141 can provide power to multiple second power modules 112.

[0083] In one embodiment, if Figure 9 As shown, the controller is further used to perform the following steps: S21b, when the discharge device is connected to the second charging connection terminal 142, confirm the working status of the first charging connection terminal 141 corresponding to the second charging connection terminal 142; S22b, when the first charging connection terminal 141 is in an idle state, obtain the second power module 112 in the idle state, and shut down the power output of the first power module 111 corresponding to the second power module 112; S23b, control the bus tie switch 130 and the first switching unit 121 so that the discharge device supplies power to the second power module 112, and control the second switching unit 122 and the bus tie switch 130 so that the second power module 112 supplies power to the first charging connection terminal 141 or the second charging connection terminal 142.

[0084] Specifically, when the discharge device provides power input to the charging stack via the second charging connection 142, it determines whether the first charging connection 141, which is connected to the second charging connection 142 via the bus tie switch 130, is occupied. If the first charging connection 141 is not occupied, the second power module 112 is detected to be in an idle state. The idle second power module 112 can be understood as an unoccupied second power module 112. The power output of the first power module 111 corresponding to the second power module 112 is shut off. It is understood that when the first power module 111 is outputting power, the power output of the first power module 111 is first shut off. At this point, the power supply of the discharge device enters the first switching unit 121 via the bus tie switch 130 and provides power input to the second power module 112 via the first switching unit 121. Then, based on the charging needs of the charging device, the second switching unit 122 and the bus tie switch 130 are controlled so that the second power module 112 participates in the power output distribution between the first charging connection 141 and the second charging connection 142. It is understood that there may be one or more discharge devices. When there are multiple discharge devices, this is equivalent to having multiple second charging connectors 142 connected to the discharge devices. Each second charging connector 142 performs the above-described operation to power the idle second power modules 112. In one embodiment, each second power module 112 can be powered by one of the second charging connectors 142. In one embodiment, the same second charging connector 142 can provide power to multiple second power modules 112.

[0085] It can be understood that when it is confirmed that the first charging connection terminal 141 corresponding to the second charging connection terminal 142 connected through the bus switch 130 is occupied, the discharge device has no way to discharge the charging stack at this time, and it is necessary to wait until the first charging connection terminal 141 turns off the charging output state before the corresponding discharge device can start powering.

[0086] It can also be understood that when a discharge device is connected, the discharge device can participate in power distribution together with the first power module 111 to adjust the power output of the first charging connection terminal 141 and the second charging connection terminal 142 .

[0087] Take a charging stack having six first power modules 111, six second power modules 112, six first charging connection terminals 141, six second charging connection terminals 142 and six bus tie switches 130 as an example. Figure 10 As shown in FIG, when the six first charging connection terminals 141 and the six second charging connection terminals 142 are charged at the same time, the power flow direction is shown by the arrows in the figure. Figure 11 As shown, when one of the second charging connection terminals 142 is connected to a discharge device, the discharge device supplies power to the charging device through the current flow direction shown in the figure. Figure 12As shown, when the power of the discharge device cannot meet the charging demand of the charging device, the charging device is powered by the first power module 111 and the discharge device at the same time through the current flow direction shown in the figure.

[0088] The above embodiment can be adjusted according to different application scenarios, achieving optimal power allocation in multiple application scenarios, maximizing the power of each power module and improving the overall charging module utilization. It can also reduce the pressure on the front-end transformer to a certain extent, eliminating the need to expand the transformer capacity and increasing charging speed.

[0089] It is understandable that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A charging stack, characterized in that: include: Several first power modules, several second power modules, several first charging connection terminals, several second charging connection terminals, several bus tie switches, a first switching unit, a second switching unit, and a controller; The plurality of second power modules form a one-to-one connection relationship with the plurality of first power modules and provide power input through the corresponding first power modules; The first switching unit is connected to all the first power modules and all the first charging connection terminals, and is used to switch the conduction state between the first charging connection terminals and the first power modules; The second switching unit is connected to all the second power modules and all the second charging connection terminals, and is used to switch the conduction state between the second charging connection terminals and the second power modules; The plurality of first charging connection terminals and the plurality of second charging connection terminals are connected in a one-to-one correspondence via the plurality of bus tie switches; The controller is used to: Obtaining an operating mode of the charging stack; According to the working mode of the charging stack, the states of the first switching unit, the second switching unit and the bus tie switch are controlled to adjust the power output of the first charging connection end and / or the second charging connection end.

2. The charging stack according to claim 1, characterized in that: The controller is also used for: When the charging stack is in a first operating mode, obtaining operating states of the first charging connection terminal and the second charging connection terminal; The states of the first switching unit, the second switching unit, and the bus tie switch are controlled according to the working states of the first charging connection terminal and the second charging connection terminal to adjust the power output of the first charging connection terminal and / or the second charging connection terminal.

3. The charging stack according to claim 2, characterized in that: The controller is also used for: When only the first charging connection end is in the charging output state, controlling the first switching unit to allocate at least one first power module to the first charging connection end, and controlling the second switching unit and the bus tie switch to remain off; When there are remaining first power modules, the remaining first power modules are allocated according to the charging requirements of the first charging connection end.

4. The charging stack according to claim 2, characterized in that: The controller is also used for: When only the second charging connection terminal is in the charging output state, controlling the first switching unit and the bus tie switch to allocate at least one first power module to each second charging connection end, and controlling the second switching unit to remain off; When there are remaining first power modules, the remaining first power modules are allocated according to the charging demand of the second charging connection end.

5. The charging stack according to claim 3 or 4, characterized in that: The controller is also used for: When the actual output power of the first charging connection end or the second charging connection end is less than the target output power, confirming the working status of all first power modules and obtaining a partially loaded first power module; The second switching unit and the bus tie switch are switched so that the partially loaded first power module supplies power to the first charging connection terminal or the second charging connection terminal through the corresponding second power module.

6. The charging stack according to claim 2, characterized in that: The controller is also used for: When both the first charging connection terminal and the second charging connection terminal are in the charging output state, controlling the first switching unit to allocate at least one first power module to each first charging connection end; confirming whether a first charging connection terminal corresponding to the second charging connection terminal is in a charging output state; If yes, controlling the second switching unit so that the second charging connection end is powered by a target second power module, wherein the target second power module is a second power module corresponding to the first power module allocated to the first charging connection end; If not, the bus tie switch and the first switching unit are controlled to allocate at least one first power module to the second charging connection end.

7. The charging stack according to claim 6, characterized in that: The controller is also used for: When all first charging connection terminals and all second charging connection terminals are in the charging output state, The first switching unit and the second switching unit are controlled so that the first power module supplies power to the corresponding first charging connection end through the first switching unit, and supplies power to the second charging connection end through the second power module and the second switching unit.

8. The charging stack according to claim 1, characterized in that: The controller is also used for: When the charging stack is in the second operating mode, determining a connection status between a discharge device and the first charging connection terminal and the second charging connection terminal, wherein the discharge device is configured to provide power input through the first charging connection terminal or the second charging connection terminal; The states of the first switching unit, the second switching unit, and the bus tie switch are controlled according to the connection states of the discharge device with the first charging connection terminal and the second charging connection terminal to adjust the power output of the first charging connection terminal and / or the second charging connection terminal.

9. The charging stack according to claim 8, characterized in that: The controller is also used for: When the discharging device is connected to the first charging connection end, obtaining a second power module in an idle state; The power output of the first power module corresponding to the second power module is turned off, and the first switching unit is controlled so that the discharge device supplies power to the second power module, and the second switching unit and the bus tie switch are controlled so that the second power module supplies power to the first charging connection terminal or the second charging connection terminal.

10. The charging stack according to claim 8, characterized in that: The controller is also used for: When the discharge device is connected to the second charging connection terminal, confirming the working status of the first charging connection terminal corresponding to the second charging connection terminal; When the first charging connection end is in an idle state, obtaining a second power module in an idle state, and shutting down the power output of the first power module corresponding to the second power module; The bus tie switch and the first switching unit are controlled so that the discharge device supplies power to the second power module, and the second switching unit and the bus tie switch are controlled so that the second power module supplies power to the first charging connection terminal or the second charging connection terminal.

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