Charging pile flexible power distribution method and charging pile

Abstract

The invention relates to a charging pile flexible power distribution method and a charging pile. Comprising the following steps: acquiring a charging port state corresponding to a charging pile; acquiring occupancy states of all charging modules in the charging pile so as to acquire occupied charging modules and unoccupied charging modules in the charging pile; obtaining the residual power of the occupied charging module according to the rated output power and the actual output power of the occupied charging module; acquiring target required power of the to-be-charged equipment, and acquiring supplementary power corresponding to the to-be-charged equipment according to the residual power and the target required power; and obtaining a target charging module of the to-be-charged equipment according to the supplementary power and the rated output power of the unoccupied charging module, so as to switch the occupied charging module and the target charging module to charge the to-be-charged equipment, and keeping the original occupied state of the occupied charging module when the occupied charging module is switched. According to the invention, the charging demand can be satisfied with the least charging modules.

Description

Technical Field

[0001] The present invention relates to the technical field of charging stacks, and more specifically, to a flexible power distribution method for a charging stack and a charging stack. Background Art

[0002] By vigorously developing new energy vehicles, vehicle exhaust emissions can be effectively reduced and air pollution can be prevented. With the continuous increase in the ownership of new energy vehicles, the construction of charging infrastructure, as an important guarantee for the popularization of electric vehicles, has also been vigorously promoted accordingly.

[0003] Currently, when the charging stack is performing a charging task, restricted by the charging modules set in the charging stack, it cannot reach full power output for most of the time, resulting in a relatively low overall charging efficiency of the charging stack station. For example, for the commonly used 40KW module in a split pile, when the BMS requires 20KW, 20KW of this 40KW module is not utilized; when multiple vehicles are charging, many modules have a lot of remaining power unused, causing waste of module power. While vehicles with relatively high actual charging requirements cannot meet their charging needs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a flexible power distribution method for a charging stack and a charging stack in view of the above partial technical defects of the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problems is to construct a flexible power distribution method for a charging stack, including the following steps:

[0006] S1. Obtain the charging port status corresponding to the charging stack, and when there is a device to be charged connected to the charging stack, execute step S2;

[0007] S2. Obtain the occupancy status of all charging modules in the charging stack to obtain the occupied charging modules and unoccupied charging modules among them;

[0008] S3. Obtain the remaining power of the occupied charging modules according to the rated output power and the actual output power of the occupied charging modules;

[0009] S4. Obtain the target demand power of the device to be charged, and obtain the supplementary power corresponding to the device to be charged according to the remaining power of the occupied charging modules and the target demand power of the device to be charged;

[0010] S5. Obtain the target charging module for the device to be charged according to the supplementary power corresponding to the device to be charged and the rated output power of the unoccupied charging modules, and switch the occupied charging modules and the target charging modules to charge the device to be charged. Among them, when switching the occupied charging modules, the original occupancy status of the occupied charging modules is retained.

[0011] In an embodiment of the flexible power distribution method of the charging stack according to the present invention, the method further includes:

[0012] S11. When multiple devices to be charged are simultaneously connected to the charging stack, obtain the priority order of the multiple devices to be charged, and perform the steps S2 to S5 for each device to be charged according to the priority order.

[0013] In an embodiment of the flexible power distribution method of the charging stack according to the present invention, the method further includes:

[0014] When there is no occupied charging module in the charging stack, obtain the target charging module of the device to be charged according to the target required power of the device to be charged and the rated output power of all charging modules in the charging stack, and switch the target charging module to charge the device to be charged.

[0015] In an embodiment of the flexible power distribution method of the charging stack according to the present invention, the method further includes:

[0016] When the device to be charged is the first connected device corresponding to the charging stack, obtain the target charging module of the device to be charged according to the target required power of the device to be charged and the rated output power of all charging modules in the charging stack, and switch the target charging module to charge the device to be charged.

[0017] In an embodiment of the flexible power distribution method of the charging stack according to the present invention, the method further includes:

[0018] When the remaining power of all occupied charging modules is zero, obtain the target charging module of the device to be charged according to the target required power of the device to be charged and the rated output power of all unoccupied charging modules in the charging stack, and switch the target charging module to charge the device to be charged.

[0019] The present invention also provides a charging stack, including: a controller, multiple charging ports, and several charging modules, several DC / DC conversion modules corresponding to the several charging modules one by one, a first switch matrix connecting the several charging modules and the multiple charging ports; a second switch matrix connecting the several DC / DC conversion modules and the multiple charging ports; the controller is used for:

[0020] Obtain the status of the charging ports corresponding to the charging stack. When a device to be charged is connected to the charging stack, obtain the occupancy status of all charging modules in the charging stack to obtain the occupied charging modules and unoccupied charging modules therein;

[0021] Obtain the remaining power of the occupied charging module according to the rated output power and the actual output power of the occupied charging module;

[0022] Obtain the target demand power of the device to be charged, so as to obtain the supplementary power corresponding to the device to be charged according to the remaining power of the occupied charging module and the target demand power of the device to be charged;

[0023] Obtain the target charging module of the device to be charged according to the supplementary power corresponding to the device to be charged and the rated output power of the unoccupied charging module, and control the second switch matrix and the first switch matrix to switch the occupied charging module and the target charging module to charge the device to be charged. Among them, when switching the occupied charging module, retain the original occupied state of the occupied charging module, and enable the occupied charging module to charge the device to be charged through the DC / DC module.

[0024] In an embodiment of the charging pile of the present invention, the controller is further configured to:

[0025] When multiple devices to be charged are connected to the charging pile at the same time, obtain the priority order of the multiple devices to be charged, so as to perform the steps of obtaining the occupied state of all charging modules in the charging pile and subsequent steps for each device to be charged according to the priority order.

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

[0027] When there is no occupied charging module in the charging pile, obtain the target charging module of the device to be charged according to the target demand power of the device to be charged and the rated output power of all charging modules in the charging pile, and control the first switch matrix to switch the target charging module to charge the device to be charged.

[0028] In an embodiment of the charging pile of the present invention, the controller is further configured to:

[0029] When the device to be charged is the first connected device corresponding to the charging pile, obtain the target charging module of the device to be charged according to the target demand power of the device to be charged and the rated output power of all charging modules in the charging pile, and control the first switch matrix to switch the target charging module to charge the device to be charged.

[0030] In an embodiment of the charging pile of the present invention, the controller is further configured to:

[0031] When the remaining power of all the occupied charging modules is zero, obtain the target charging module for the device to be charged according to the target demand power of the device to be charged and the rated output power of all the unoccupied charging modules in the charging stack, and control the first switch matrix to switch the target charging module to charge the device to be charged.

[0032] Implementing a flexible power distribution method for a charging stack and a charging stack according to the present invention has the following beneficial effects: achieving the charging demand with the fewest charging modules and improving the operation efficiency of the entire charging stack yard. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0034] Figure 1 is a program flowchart of an embodiment of a flexible power distribution method for a charging stack according to the present invention;

[0035] Figure 2 is a program flowchart of another embodiment of a flexible power distribution method for a charging stack according to the present invention;

[0036] Figure 3 is a logic block diagram of an embodiment of a charging stack according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the drawings.

[0038] As Figure 1 shown, an embodiment of a flexible power distribution method for a charging stack according to the present invention is shown. In Figure 1 the embodiment of a flexible power distribution method for a charging stack according to the present invention shown, the following steps are included: S1. Obtain the charging port status corresponding to the charging stack. When there is a device to be charged connected to the charging stack, execute step S2; S2. Obtain the occupancy status of all the charging modules in the charging stack to obtain the occupied charging modules and the unoccupied charging modules therein; S3. Obtain the remaining power of the occupied charging modules according to the rated output power and the actual output power of the occupied charging modules; S4. Obtain the target demand power of the device to be charged to obtain the supplementary power corresponding to the device to be charged according to the remaining power of the occupied charging modules and the target demand power of the device to be charged; S5. Obtain the target charging module for the device to be charged according to the supplementary power corresponding to the device to be charged and the rated output power of the unoccupied charging modules, and switch the occupied charging modules and the target charging modules to charge the device to be charged. Among them, when switching the occupied charging modules, the original occupancy status of the occupied charging modules is retained.

[0039] Based on step S1, during the operation of the charging pile, the corresponding charging port status is obtained according to a preset rule. The charging ports of the charging pile are used to connect external devices to provide charging power to the external devices. For example, power output is provided to an external device so that the external device can be charged when receiving the power. The external device can be a new energy device such as an electric vehicle. The number of charging ports set on the charging pile is usually multiple. That is, multiple charging ports can be respectively connected to different external devices to supply power to different external devices simultaneously. The charging pile determines whether there are external devices connected to each charging port according to the set rule. Here, the external device can be understood as a device to be charged. When it can be determined that one or more charging ports of the charging pile are connected to an external device, it means that there is a device to be charged connected to the charging pile, and then step S2 can be executed.

[0040] Based on step S2, when there is a device to be charged connected, the occupancy status of all charging modules in the charging pile is judged. When a charging module has been used to supply power to other external devices, it means that the charging module has been occupied, that is, the charging module is defined as an occupied charging module. Otherwise, it can be judged that the charging module is not occupied, that is, the charging module is defined as an unoccupied charging module.

[0041] Based on step S3, the remaining power of the occupied charging modules is calculated. That is, the corresponding remaining power can be calculated according to the rated output power and the actual output power of the occupied charging modules. It can be understood that the occupied charging modules are used to supply power to existing external devices, so the occupied charging modules can be calculated based on the power requirements of the existing external devices. Because in some cases, the sum of the full-power outputs of the occupied charging modules is not necessarily exactly equal to the power requirement of the external device. More often, it is greater than the power requirement of the external device. Therefore, all charging modules except a specific charging module can be set to full-power output, and the remaining power of the specific charging module is obtained as the remaining power of the occupied charging modules. It can also be understood that during the actual operation process, each occupied charging module does not output at full power. Directly using the difference between the sum of the full-power output powers of all occupied charging modules and the power requirement of the external device as the remaining power of the occupied charging modules, without emphasizing the remaining power of a certain occupied charging module.

[0042] Based on step S4, when allocating charging modules based on the target demand power of the device to be charged, first include the remaining power of the occupied charging modules in the allocation calculation, that is, calculate the difference between the target demand power and the remaining power. This difference can be understood as the supplementary power that still needs to be supplemented by other charging modules.

[0043] Based on step S5, after obtaining the supplementary power of the device to be charged, the power can be allocated according to the rated output power of the unoccupied charging modules in the charging stack to select appropriate charging modules, i.e., target charging modules, to supply power to the device to be charged. It should be noted that the sum of the rated output powers of all target charging modules should be greater than or equal to the supplementary power. Switch the working states of the occupied charging modules and the target charging modules so that the device to be charged can be powered simultaneously by the occupied charging modules and the target charging modules. At this time, since the remaining power of the occupied charging modules is utilized, the original occupied state of the occupied charging modules needs to be retained during the switching process.

[0044] In a specific embodiment, by switching the state of one occupied charging module, the remaining power of the occupied charging module can be used to supply power to the device to be charged. In some scenarios, multiple occupied charging modules can also be switched simultaneously so that multiple occupied charging modules jointly provide the remaining power to the device to be charged.

[0045] As Figure 2 shown, in an embodiment, the flexible power allocation method for the charging stack of the present invention further includes: S11. When multiple devices to be charged are simultaneously connected to the charging stack, obtain the priority order of the multiple devices to be charged, and perform steps S2 to S5 for each device to be charged according to the priority order. Specifically, during the operation of the charging stack, multiple devices to be charged may be simultaneously connected for charging. To avoid conflicts in the allocation of charging modules, the multiple devices to be charged can be sorted by priority to obtain the priority order of the multiple devices to be charged. The process of sorting the multiple devices to be charged by priority can be sorting according to preset rules, such as sorting according to the magnitude of the rated power, or sorting according to the serial number or number order of the connected charging ports. This is not limited here. According to the obtained priority order, steps S2 to S5 above are performed for each device to be charged in descending order of priority. It should be emphasized here that after the power allocation of each device to be charged is completed and it enters the charging state, the occupied state of the charging modules in the charging stack will be updated, and the next device to be charged needs to obtain the occupied charging modules and unoccupied charging modules according to the new occupied state of the charging modules, and then perform the charging module allocation.

[0046] It can also be understood that, according to the set rules, the individual power allocation can be simultaneously performed for two or more devices to be charged, that is, the two or more devices to be charged are set not to use the remaining power of the occupied charging modules and only use the unoccupied charging modules to participate in the power allocation.

[0047] In one embodiment, the flexible power distribution method of the charging pile of the present invention further includes: when there is no occupied charging module in the charging pile, obtaining the target charging module for the device to be charged according to the target required power of the device to be charged and the rated output power of all charging modules in the charging pile, so as to switch the target charging module to charge the device to be charged. Specifically, when judging the occupancy status of the charging modules in the charging pile, it is possible that all charging modules are not occupied. For example, sometimes, although some connected external devices have completed charging, they still maintain a connection relationship with the charging pile. At this time, the output of the charging module inside the charging pile will be turned off to cut off the power supply to the external device. At this time, it is equivalent that the state of the charging module has been released from the occupied state and is in the unoccupied state. Based on this, for the newly connected device to be charged, all the internal charging modules are in the unoccupied state. At this time, the target charging module for the device to be charged can be directly selected according to the target required power of the device to be charged and the rated output power of all the charging modules in the charging pile. At this time, the sum of the total rated output powers of the target charging modules is greater than or equal to the target required power of the device to be charged.

[0048] In one embodiment, the flexible power distribution method of the charging pile of the present invention further includes: when the device to be charged is the first connected device corresponding to the charging pile, obtaining the target charging module for the device to be charged according to the target required power of the device to be charged and the rated output power of all charging modules in the charging pile, so as to switch the target charging module to charge the device to be charged. Specifically, when it can be determined that the device to be charged is the first connected device of the charging pile, that is, at this time, all the charging modules in the charging pile cannot supply power to other external devices and are all in the unoccupied state, that is, there is no occupied charging module. At this time, the target charging module for the device to be charged can be directly selected according to the target required power of the device to be charged and the rated output power of all the charging modules in the charging pile. At this time, the sum of the total rated output powers of the target charging modules is greater than or equal to the target required power of the device to be charged.

[0049] In one embodiment, the flexible power distribution method of the charging pile of the present invention further includes: when the remaining powers of all occupied charging modules are zero, obtaining the target charging module for the device to be charged according to the target required power of the device to be charged and the rated output power of all unoccupied charging modules in the charging pile, so as to switch the target charging module to charge the device to be charged. Specifically, in some scenarios, the power required by the connected external device for the charging module just makes all the occupied charging modules output at full power, so the remaining power of the occupied charging module is zero. At this time, the target charging module for the device to be charged can be directly selected according to the target required power of the device to be charged and the rated output power of all unoccupied charging modules in the charging pile. At this time, the sum of the total rated output powers of the target charging modules is greater than or equal to the target required power of the device to be charged.

[0050] As Figure 3 shown, the charging stack of the present invention includes: a controller (not shown in the figure), a plurality of charging ports 130, a plurality of charging modules 110, a plurality of DC / DC conversion modules 120 corresponding to the plurality of charging modules 110 one by one, and a first switch matrix 141 connecting the plurality of charging modules 110 and the plurality of charging ports 130; a second switch matrix 142 connecting the plurality of DC / DC conversion modules 120 and the plurality of charging ports 130; the controller is configured to: obtain the status of the charging ports 130 corresponding to the charging stack, and when there is a device to be charged connected to the charging stack, obtain the occupancy status of all the charging modules in the charging stack to obtain the occupied charging modules and the unoccupied charging modules therein; obtain the remaining power of the occupied charging modules according to the rated output power and the actual output power of the occupied charging modules; obtain the target demand power of the device to be charged, so as to obtain the supplementary power corresponding to the device to be charged according to the remaining power of the occupied charging modules and the target demand power of the device to be charged; obtain the target charging module of the device to be charged according to the supplementary power corresponding to the device to be charged and the rated output power of the unoccupied charging modules, and control the second switch matrix 142 and the first switch matrix 141 to switch the occupied charging modules and the target charging modules to charge the device to be charged, wherein when switching the occupied charging modules, the original occupancy status of the occupied charging modules is retained, and the occupied charging modules charge the device to be charged through the DC / DC conversion modules.

[0051] Specifically, during the operation of the charging stack, the status of the corresponding charging ports is obtained according to a preset rule. The charging ports of the charging stack are used to connect external devices to provide a charging power source for the external devices. For example, power is output to an external device so that the external device is charged when receiving the power. The external device can be a new energy device such as an electric vehicle. The number of charging ports provided in the charging stack is usually multiple. That is, the multiple charging ports can be respectively connected to different external devices to supply power to different external devices simultaneously. The charging stack determines whether there is an external device connected to each charging port according to the set rule. Here, the external device can be understood as a device to be charged. When it can be determined that one or more charging ports of the charging stack are connected to an external device, it means that there is a device to be charged connected to the charging stack.

[0052] When there is a device to be charged connected, the occupancy status of all the charging modules in the charging stack is judged. When a charging module has been used to supply power to other external devices, it means that the charging module has been occupied, that is, the charging module is defined as an occupied charging module, otherwise it can be judged that the charging module is not occupied, that is, the charging module is defined as an unoccupied charging module.

[0053] Calculate the remaining power of the occupied charging module, that is, the corresponding remaining power can be calculated according to the rated output power and the actual output power of the occupied charging module. It can be understood that the occupied charging module is used to supply power to the existing external device, so the corresponding occupied charging module can be calculated based on the power demand of the existing external device. Because in some cases, the sum of the full-power outputs of the occupied charging modules is not necessarily exactly equal to the power demand of the external device. More often, it is greater than the power demand of the external device. Therefore, it is possible to set all charging modules except a specific charging module to full-power output and obtain the remaining power of the specific charging module as the remaining power of the occupied charging module. It can also be understood that in the actual working process, each occupied charging module does not output at full power. Directly use the difference between the sum of the full-power output powers of all occupied charging modules and the power demand of the external device as the remaining power of the occupied charging module, without emphasizing the remaining power of a certain occupied charging module.

[0054] When allocating charging modules based on the target demand power of the device to be charged, first include the remaining power of the occupied charging module in the allocation calculation, that is, calculate the difference between the target demand power and the remaining power. This difference can be understood as the supplementary power that still needs to be supplemented by other charging modules.

[0055] After obtaining the supplementary power of the device to be charged, power allocation can be carried out according to the rated output power of the unoccupied charging modules in the charging stack to select appropriate charging modules, that is, target charging modules, to supply power to the device to be charged. It should be noted that the sum of the rated output powers of all target charging modules should be greater than or equal to this supplementary power. Switch the working states of the occupied charging module and the target charging module so that the device to be charged can be supplied power by the occupied charging module and the target charging module simultaneously. Among them, the charging connection process of the occupied module to the device to be charged can be realized through the working state of the second switch matrix 142 inside the charging stack, and the charging connection process of the target charging module to the device to be charged can be realized through the working state of the first switch matrix 141 inside the charging stack. At this time, since the remaining power of the occupied charging module is utilized, therefore, during the switching process, the original occupied state of the occupied charging module needs to be retained. That is, the working state of the DC / DC conversion module 120 of the occupied charging module can be switched so that the remaining power of the occupied charging module charges the device to be charged through the DC / DC conversion module 120 and the second switch matrix 142.

[0056] In a specific embodiment, by switching the state of an occupied charging module, that is, controlling the DC / DC conversion module 120 corresponding to the occupied charging module to work, the remaining power of the occupied charging module can be used to supply power to the device to be charged. In some scenarios, it is also possible to switch multiple occupied charging modules simultaneously, that is, control the DC / DC conversion module 120 corresponding to the multiple occupied charging modules to work, so that the multiple occupied charging modules jointly provide the remaining power to the device to be charged.

[0057] In an embodiment of the charging pile of the present invention, the controller is further configured to: when multiple devices to be charged are connected to the charging pile simultaneously, obtain the priority order of the multiple devices to be charged, so as to perform the steps of obtaining the occupancy status of all charging modules in the charging pile and subsequent steps for each device to be charged according to the priority order. Specifically, during the operation of the charging pile, multiple devices to be charged may be connected to the charging pile simultaneously. To avoid conflicts in the allocation of charging modules, the multiple devices to be charged can be sorted by priority to obtain the priority order of the multiple devices to be charged. The process of sorting the multiple devices to be charged by priority can be sorted according to a preset rule, for example, sorted according to the size of the rated power, or sorted according to the connection sequence number or serial number of the charging ports. This is not limited here. According to the obtained priority order, the occupancy status of all charging modules in the charging pile is rejudged for each device to be charged from high to low according to the priority. It should be emphasized here that after the power allocation of each device to be charged is completed and it enters the charging state. The occupancy status of the charging modules in the charging pile will be updated, and the next device to be charged needs to obtain the occupied charging modules and unoccupied charging modules according to the new occupancy status of the charging modules, and then perform the charging module allocation.

[0058] It can also be understood that according to the setting rules, it is possible to perform separate power allocation for two or more devices to be charged simultaneously, that is, the two or more devices to be charged are set not to use the remaining power of the occupied charging modules and only use the unoccupied charging modules to participate in the power allocation.

[0059] In an embodiment of the charging pile of the present invention, the controller is further configured to, when there is no occupied charging module in the charging pile, obtain the target charging module for the device to be charged according to the target required power of the device to be charged and the rated output power of all charging modules in the charging pile, and control the first switch matrix 141 to switch the target charging module to charge the device to be charged. Specifically, when judging the occupancy status of the charging modules in the charging pile, it is possible that all charging modules are not occupied. For example, sometimes, although some connected external devices have completed charging, they still maintain a connection relationship with the charging pile. At this time, the output of the charging module inside the charging pile will be turned off to cut off the power supply to the external device. At this time, it is equivalent that the state of the charging module has been released from the occupied state and is in the unoccupied state. Based on this, for the newly connected device to be charged, all internal charging modules are in the unoccupied state. At this time, the target charging module for the device to be charged can be directly selected according to the target required power of the device to be charged and the rated output power of all charging modules in the charging pile. At this time, only the control process of the first switch matrix 141 needs to be performed, so that the target charging module realizes the charging connection process with the device to be charged through the working state of the first switch matrix 141 inside the charging pile. At the same time, the sum of the total rated output powers of the target charging modules is greater than or equal to the target required power of the device to be charged.

[0060] In an embodiment of the charging pile of the present invention, the controller is further configured to: when the device to be charged is the first connected device corresponding to the charging pile, obtain the target charging module for the device to be charged according to the target required power of the device to be charged and the rated output power of all charging modules in the charging pile, and control the first switch matrix 141 to switch the target charging module to charge the device to be charged. Specifically, when it can be determined that the device to be charged is the first connected device of the charging pile, that is, at this time, all charging modules in the charging pile cannot supply power to other external devices and are all in the unoccupied state, that is, there is no occupied charging module. At this time, the target charging module for the device to be charged can be directly selected according to the target required power of the device to be charged and the rated output power of all charging modules in the charging pile. At this time, only the control process of the first switch matrix 141 needs to be performed, so that the target charging module realizes the charging connection process with the device to be charged through the working state of the first switch matrix 141 inside the charging pile. At the same time, the sum of the total rated output powers of the target charging modules is greater than or equal to the target required power of the device to be charged.

[0061] In an embodiment of the charging pile of the present invention, the controller is further configured to: when the remaining power of all occupied charging modules is zero, obtain the target charging module for the device to be charged according to the target demand power of the device to be charged and the rated output power of all unoccupied charging modules in the charging pile, and control the first switch matrix 141 to switch the target charging module to charge the device to be charged. Specifically, in some scenarios, the power required by the externally connected device for the charging module just makes all occupied charging modules output at full power, so the remaining power of the occupied charging modules is zero. At this time, the target charging module for the device to be charged can be directly selected according to the target demand power of the device to be charged and the rated output power of all unoccupied charging modules in the charging pile. At this time, only the control process of the first switch matrix 141 needs to be performed, so that the target charging module realizes the charging connection process with the device to be charged through the working state of the first switch matrix 141 inside the charging pile. At the same time, the sum of the total rated output powers of the target charging modules is greater than or equal to the target demand power of the device to be charged.

[0062] Based on the current general split-pile power scheduling scheme, one vehicle requires one charging module or multiple charging modules to supply power. If single-module power supply is adopted, when the BMS demand power is small, the power of the charging module cannot be fully utilized; while when multi-module power supply is adopted, the BMS demand power is evenly distributed to each charging module, which will also cause the power of the charging module to be unable to be fully utilized. Ultimately, the power of the charging module cannot be fully utilized, resulting in a reduction in the utilization efficiency of the charging module, and the utilization efficiency of the front-end transformer may also be reduced, causing power waste, thereby reducing the operation efficiency of the station. Through the embodiments of the present invention, the power of each charging module can be maximally used, the overall utilization rate of the charging module can be improved, and to a certain extent, the pressure on the front-end transformer can be reduced. Without expanding the transformer capacity, the charging speed can be increased, and ultimately the purpose of improving the operation efficiency of the station can be achieved.

[0063] In a specific embodiment, the charging stack is powered by AC 380V, and charging modules M1 to M18 are arranged inside, that is, a total of 18 charging modules. The rated output power corresponding to each charging module is 40KW. Each charging module can be composed of one or more power modules. A total of 18 DC / DC modules (corresponding to the DC / DC conversion module 120) from N1 to N18 are also arranged inside the charging stack. Through the power switching unit 1 (corresponding to the first switch matrix 141), each charging module can allocate power to any charging gun. Through the power switching unit 2 (corresponding to the second switch matrix 142), each DC / DC module can compensate power to any charging port. Among them, 1DC1 to 1DC12 are charging ports. 2DC1 to 2DC12 are compensation ports. A one-to-one connection relationship can be formed between 1DC1 to 1DC12 and 2DC1 to 2DC12 inside. For example, the 1DC1 charging port can achieve power compensation through 2DC1.

[0064] During charging, according to the power demand in the BMS message, the charging port determines the number of modules called by each charging port, calculates the remaining power of each charging module (remaining power = rated power - current power). The remaining power of each charging module is concentrated on the 2DC1 to 2DC12 interfaces of the power switching unit 2 through their respective DC / DC modules, and then power compensation for the corresponding charging port is achieved.

[0065] Taking the 40KW module as an example, the required power of the 1DC1 charging port is 20KW, the required power of the 1DC2 charging port is 90KW, and the required power of the 1DC3 charging port is 50KW. In a general solution, that is, when the DC / DC module does not switch its operation, the actual number of 40KW modules called = the number of modules called by the 1DC1 charging port + the number of modules called by the 1DC2 charging port + the number of modules called by the 1DC3 charging port = 1 + 3 + 2 = 6. The full power of 6 40KW modules is 240KW, and the current power used = 20KW + 90KW + 50KW = 160KW, and 80KW of power is not utilized.

[0066] Through the above embodiment, that is, controlling the operation of the DC / DC module, when the 1DC1 charging port, the 1DC3 charging port, and the 1DC2 charging port are connected in sequence, the 20KW remaining power of the 1DC1 charging port can be compensated to the 1DC3 charging port through the DC / DC module and the power switching unit 2. The remaining power of the 1DC3 charging port is compensated to the 1DC2 charging port through the DC / DC module and the power switching unit 2, and the compensation power is 20KW + 30KW = 50KW. At this time, only 1 40KW charging module needs to be called for the 1DC2 charging port to meet the BMS requirements. At this time, the number of modules called is 1 + 2 + 1 = 4, and each charging module is fully utilized.

[0067] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A charging stack flexible power distribution method, characterized in that: The following steps are involved: S1. Obtain the status of the charging port corresponding to the charging stack. When a device to be charged is connected to the charging stack, execute step S2. S2. Obtaining the occupation status of all charging modules in the charging stack to obtain occupied charging modules and unoccupied charging modules therein; S3. Obtaining the remaining power of the occupied charging module according to the rated output power of the occupied charging module and the actual output power of the occupied charging module; S4, obtaining the target required power of the device to be charged, so as to obtain the supplementary power corresponding to the device to be charged according to the remaining power of the occupied charging module and the target required power of the device to be charged; S5. Obtain the target charging module of the device to be charged according to the supplementary power corresponding to the device to be charged and the rated output power of the unoccupied charging module, so as to switch the occupied charging module and the target charging module to charge the device to be charged, wherein the original occupied state of the occupied charging module is retained when switching the occupied charging module.

2. The charging stack flexible power distribution method according to claim 1, characterized in that: The method further comprises: S11. When a plurality of devices to be charged are connected to the charging stack at the same time, the priority order of the plurality of devices to be charged is obtained, so as to execute steps S2 to S5 for each device to be charged according to the priority order.

3. The charging stack flexible power distribution method according to claim 1, characterized in that: The method further comprises: When the occupied charging module is not in the charging stack, the target charging module of the device to be charged is obtained according to the target required power of the device to be charged and the rated output power of all charging modules in the charging stack, so as to switch the target charging module to charge the device to be charged.

4. The charging stack flexible power distribution method according to claim 1, characterized in that: The method further comprises: When the device to be charged is the first connected device corresponding to the charging stack, the target charging module of the device to be charged is obtained according to the target required power of the device to be charged and the rated output power of all charging modules in the charging stack, so as to switch the target charging module to charge the device to be charged.

5. The charging stack flexible power distribution method according to claim 1, characterized in that: The method further comprises: When the remaining powers of the occupied charging modules are all zero, the target charging module of the device to be charged is obtained according to the target required power of the device to be charged and the rated output powers of all unoccupied charging modules in the charging stack, so as to switch the target charging module to charge the device to be charged.

6. A charging stack, characterized in that: The system comprises: a controller and a plurality of charging ports, and a plurality of charging modules, a plurality of DC / DC conversion modules corresponding to the plurality of charging modules, a first switch matrix connecting the plurality of charging modules and the plurality of charging ports; and a second switch matrix connecting the plurality of DC / DC conversion modules and the plurality of charging ports. The controller is used for: Obtaining the state of the charging port corresponding to the charging stack, and when a device to be charged is connected to the charging stack, obtaining the occupancy state of all charging modules in the charging stack to obtain occupied charging modules and unoccupied charging modules therein; Acquire the remaining power of the occupied charging module according to the rated output power of the occupied charging module and the actual output power of the occupied charging module; Obtaining the target required power of the device to be charged, so as to obtain the supplementary power corresponding to the device to be charged according to the remaining power of the occupied charging module and the target required power of the device to be charged; The target charging module of the device to be charged is obtained according to the supplementary power corresponding to the device to be charged and the rated output power of the unoccupied charging module, and the second switch matrix and the first switch matrix are controlled to switch the occupied charging module and the target charging module to charge the device to be charged, wherein when the occupied charging module is switched, the original occupied state of the occupied charging module is retained, and the occupied charging module charges the device to be charged through the DC / DC module.

7. The charging stack according to claim 6, characterized in that: The controller is also used for: When multiple devices to be charged are connected to the charging stack at the same time, the priority order of the multiple devices to be charged is obtained, so that the occupancy status of all charging modules in the charging stack and subsequent steps are obtained for each device to be charged according to the priority order.

8. The charging stack according to claim 6, characterized in that: The controller is also used for: When there is no occupied charging module in the charging stack, the target charging module of the device to be charged is obtained according to the target required power of the device to be charged and the rated output power of all charging modules in the charging stack, and the first switch matrix is ​​controlled to switch the target charging module to charge the device to be charged.

9. The charging stack according to claim 6, characterized in that: The controller is also used for: When the device to be charged is the first connected device corresponding to the charging stack, the target charging module of the device to be charged is obtained according to the target required power of the device to be charged and the rated output power of all charging modules in the charging stack, and the first switch matrix is ​​controlled to switch the target charging module to charge the device to be charged.

10. The charging stack according to claim 6, characterized in that: The controller is also used for: When the remaining power of the occupied charging modules is zero, the target charging module of the device to be charged is obtained according to the target required power of the device to be charged and the rated output power of all unoccupied charging modules in the charging stack, and the first switch matrix is ​​controlled to switch the target charging module to charge the device to be charged.

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