Power distribution system with off-grid power supply function

Abstract

The utility model provides a power distribution system with an off-grid power supply function, and relates to the technical field of V2X. The electric energy storage unit and the switch unit are arranged in the distribution box, the electric energy storage unit is electrically connected to the bidirectional charging and discharging pile through the switch unit, when the power grid is powered on (in a grid-connected state), the electric energy storage unit stores the electric energy provided by the power grid, and when the power grid is powered off (in an off-grid state), the electric energy storage unit stores the electric energy provided by the power grid. The switch unit is connected with the electric energy storage unit and the two-way charging and discharging pile under the control of a user, and under the condition, the electric energy storage unit can supply power to the two-way charging and discharging pile by utilizing electric energy stored by the electric energy storage unit, so that the two-way charging and discharging pile can be started in an off-grid state and transmits the electric energy stored on the electric automobile to external target equipment; therefore, power is supplied to the external target equipment. On the basis, the discharging function of the bidirectional charging and discharging pile in the off-grid state is ensured.

Description

Technical Field

[0001] This application relates to the technical field of V2X (vehicle to X, two-way energy flow between electric vehicles and X), and particularly to a power distribution system with an off-grid power supply function. Background Art

[0002] V2X means two-way energy flow between an electric vehicle and X. X can be either an energy source or an electrical load, and the two-way flowing energy can be either AC or DC. Taking a power distribution system composed of a power grid, a distribution box, a bi-directional charging and discharging pile, and an electric vehicle as an example, V2X can not only use the bi-directional charging and discharging pile to deliver the electric energy of the power grid to the electric vehicle, but also feedback the electric energy stored in the electric vehicle to the power grid through the bi-directional charging and discharging pile. Even the electric vehicle can be used as a power supply and supply power to other external devices through the bi-directional charging and discharging pile, thus realizing two-way energy flow.

[0003] In the related art, in the grid-connected state, the distribution box can cooperate with the bi-directional charging and discharging pile for two-way charging / discharging. However, when the power grid is powered off, that is, in the off-grid state, the distribution box cannot supply power to the bi-directional charging and discharging pile, resulting in the inability to start the bi-directional charging and discharging pile, and the electric vehicle cannot be used as a power supply to supply power to other external devices through the bi-directional charging and discharging pile, seriously restricting the discharging function of the bi-directional charging and discharging pile. Summary of the Utility Model

[0004] This application provides a power distribution system with an off-grid power supply function, aiming to solve the problem that the discharging function of the bi-directional charging and discharging pile is severely restricted in the off-grid state in the related art.

[0005] To solve the above technical problems existing in the related art, this application provides a power distribution system with an off-grid power supply function. The power distribution system includes a bi-directional charging and discharging pile, a distribution box, and a power grid. A power distribution line, an energy storage unit, and a switch unit are arranged in the distribution box. Both the bi-directional charging and discharging pile and the energy storage unit are electrically connected to the power grid through the power distribution line. The bi-directional charging and discharging pile is electrically connected to the energy storage unit through the switch unit. The bi-directional charging and discharging pile is used to be electrically connected to at least one electric vehicle. Specifically, when in the grid-connected state, the power distribution line delivers the electric energy provided by the power grid to the energy storage unit and the bi-directional charging and discharging pile. The bi-directional charging and discharging pile is started based on the electric energy provided by the power grid, and delivers the electric energy provided by the power grid to the electric vehicle, or feeds back the electric energy stored in the electric vehicle to the power grid through the power distribution line, or delivers the electric energy stored in the electric vehicle to a target device in the external through the power distribution line. When in the off-grid state, the switch unit is controlled by the user to connect the energy storage unit and the bi-directional charging and discharging pile. The bi-directional charging and discharging pile is started based on the electric energy stored in the energy storage unit, and delivers the electric energy stored in the electric vehicle to a target device in the external through the power distribution line.

[0006] Through the implementation of the above technical solutions of the present application, an electric energy storage unit and a switch unit are provided in the distribution box, and the electric energy storage unit is electrically connected to the bi-directional charging and discharging pile through the switch unit. When the power grid is energized (i.e., in the grid-connected state), the electric energy storage unit can store the electric energy provided by the power grid. When the power grid is powered off (i.e., in the off-grid state), the switch unit can connect the electric energy storage unit and the bi-directional charging and discharging pile under the control of the user, and the electric energy storage unit can use the electric energy stored by itself to supply power to the bi-directional charging and discharging pile, so that the bi-directional charging and discharging pile can be started in the off-grid state, and the electric energy stored in the electric vehicle can be transmitted to the target device outside through the distribution line, thereby supplying power to the target device outside. It can be seen that when the power grid is powered off and enters the off-grid state accordingly, the distribution box can still supply power to the bi-directional charging and discharging pile, that is, the bi-directional charging and discharging pile can still be started normally. In this way, the electric vehicle can be used as a power source and supply power to the target device outside through the bi-directional charging and discharging pile, thus ensuring the discharging function of the bi-directional charging and discharging pile in the off-grid state. Description of the Drawings

[0007] In order to more clearly illustrate the related technologies or the technical solutions in the embodiments of the present application, the drawings required for the description of the related technologies or the embodiments of the present application will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, rather than all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0008] Figure 1 The first module block diagram of the power distribution system provided by the embodiment of the present application;

[0009] Figure 2 The second module block diagram of the power distribution system provided by the embodiment of the present application;

[0010] Figure 3 The third module block diagram of the power distribution system provided by the embodiment of the present application. Detailed Embodiments

[0011] In order to make the objectives, technical solutions, and advantages of the present application more obvious and understandable, the present application will be clearly and completely described below in conjunction with the embodiments of the present application and the corresponding drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. It should be understood that the various embodiments of the present application described below are only used to explain the present application and are not used to limit the present application. That is, based on the various embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0012] In the related art, in the grid-connected state, the distribution box can cooperate with the bi-directional charging and discharging pile for bi-directional charging / discharging. However, when the power grid is powered off, the distribution box cannot supply power to the bi-directional charging and discharging pile, resulting in the inability to start the bi-directional charging and discharging pile, and the electric vehicle cannot be used as a power source to supply power to other external devices through the bi-directional charging and discharging pile, severely limiting the discharging function of the bi-directional charging and discharging pile. For this reason, the present application proposes a distribution system with an off-grid power supply function in the embodiments below. In this distribution system, when the power grid is powered off and enters the off-grid state accordingly, the distribution box can still supply power to the bi-directional charging and discharging pile, that is, the bi-directional charging and discharging pile can still be normally started. In this way, the electric vehicle can be used as a power source to supply power to other external devices through the bi-directional charging and discharging pile, thus ensuring the discharging function of the bi-directional charging and discharging pile in the off-grid state.

[0013] Figure 1 FIG. 1 is the first module block diagram of the distribution system. In some embodiments, the distribution system includes a bi-directional charging and discharging pile 300, a distribution box 200, and a power grid 100. The power grid 100 is electrically connected to the distribution box 200, and the distribution box 200 is electrically connected to the bi-directional charging and discharging pile 300. Specifically, the bi-directional charging and discharging pile 300 is used to be electrically connected to at least one electric vehicle. A distribution line 210, an electrical energy storage unit 220, and a switch unit 250 are provided in the distribution box 200. Both the bi-directional charging and discharging pile 300 and the electrical energy storage unit 220 are electrically connected to the power grid 100 through the distribution line 210, and the bi-directional charging and discharging pile 300 is electrically connected to the electrical energy storage unit 220 through the switch unit 250. Preferably, the electrical energy storage unit 220 uses a storage battery, such as a lead-acid battery, a lithium-ion battery, a nickel-metal hydride battery, etc. The electrical energy storage unit 220 may include a single storage battery or a storage battery pack composed of several storage batteries. The present application does not make a unique limitation on this.

[0014] In the actual power distribution process, when the power grid 100 is powered on, that is, in the grid-connected state, the power distribution line 210 can deliver the electric energy provided by the power grid 100 to the electric energy storage unit 220 and the bidirectional charging and discharging pile 300. The electric energy storage unit 220 can store the electric energy provided by the power grid 100. The bidirectional charging and discharging pile 300 can be started based on the electric energy provided by the power grid 100, and deliver the electric energy provided by the power grid 100 to the electric vehicle to charge the electric vehicle, or feedback the electric energy stored in the electric vehicle to the power grid 100 through the power distribution line 210, or deliver the electric energy stored in the electric vehicle to an external target device through the power distribution line 210 to supply power to the target device. The target device can include, but is not limited to, household devices such as refrigerators, air conditioners, televisions, washing machines, etc.; when the power grid 100 is powered off, that is, in the off-grid state, the switch unit 250 can connect the electric energy storage unit 220 and the bidirectional charging and discharging pile 300 under the control of the user. The bidirectional charging and discharging pile 300 can be started based on the electric energy stored in the electric energy storage unit 220, and deliver the electric energy stored in the electric vehicle to the target device through the power distribution line 210 to supply power to the target device. It can be seen that in this application, when the power grid 100 is powered off and enters the off-grid state accordingly, although the power grid 100 cannot supply power to the bidirectional charging and discharging pile 300, the electric energy storage unit 220 in the distribution box 200 can still supply power to the bidirectional charging and discharging pile 300, which enables the bidirectional charging and discharging pile 300 to still start normally in the off-grid state. Then the electric vehicle can be used as a power source and supply power to an external target device through the bidirectional charging and discharging pile 300, thus ensuring the discharging function of the bidirectional charging and discharging pile 300 in the off-grid state.

[0015] As one of the embodiments, Figure 2It is the second module block diagram of the power distribution system. The switch unit 250 includes a button 251 and a single-pole single-throw switch 252. The button 251 is provided on the outer wall of the distribution box 200, and the single-pole single-throw switch 252 is arranged inside the distribution box 200. The bi-directional charging and discharging pile 300 is electrically connected to the energy storage unit 220 through the single-pole single-throw switch 252, and the button 251 is linked to the handle of the single-pole single-throw switch 252. During the actual power distribution process, when the power grid 100 loses power and enters the off-grid state accordingly, the user can press the button 251. During the process of the user pressing the button 251, the button 251 will push the handle of the single-pole single-throw switch 252, ultimately causing the single-pole single-throw switch 252 to close, thereby connecting the energy storage unit 220 and the bi-directional charging and discharging pile 300, enabling the bi-directional charging and discharging pile 300 to start based on the electric energy stored in the energy storage unit 220, and transmitting the electric energy stored in the electric vehicle to the target device through the power distribution line 210. Correspondingly, in the off-grid state, if it is no longer necessary to supply power to the target device, then the user can reset the button 251. During the process of the button 251 being reset, it will pull the handle of the single-pole single-throw switch 252, ultimately causing the single-pole single-throw switch 252 to disconnect, thereby disconnecting the electrical connection between the energy storage unit 220 and the bi-directional charging and discharging pile 300, making the bi-directional charging and discharging pile 300 unable to start, and the bi-directional charging and discharging pile 300 also unable to transmit the electric energy stored in the electric vehicle to the target device through the power distribution line 210.

[0016] Furthermore, in addition to the power distribution line 210, the energy storage unit 220, and the switch unit 250, a monitoring unit 260, a timing unit 270, and a control unit 280 are also provided inside the distribution box 200. The timing unit 270 is electrically connected to the control unit 280, the control unit 280 is electrically connected to the single-pole single-throw switch 252, the control unit 280 is electrically connected to the monitoring unit 260, and the monitoring unit 260 is electrically connected to the target device. During the actual power distribution process, when the power grid 100 loses power and enters the off-grid state accordingly, the monitoring unit 260 can obtain the power consumption information of the target device (such as voltage, current, power, etc.), and the control unit 280 can judge whether the target device is operating based on the power consumption information and control the timing unit 270 to start timing when it judges that the target device is not operating. When the time counted by the timing unit 270 is greater than the preset duration and the target device is still not operating, the control unit 280 can control the single-pole single-throw switch 252 to disconnect, thereby disconnecting the electrical connection between the energy storage unit 220 and the bi-directional charging and discharging pile 300.

[0017] It can be understood that the purpose of closing the single-pole single-throw switch 252 is to connect the energy storage unit 220 and the bidirectional charging and discharging pile 300, so that the bidirectional charging and discharging pile 300 can be started based on the electric energy stored in the energy storage unit 220, and the electric energy stored in the electric vehicle can be used to power the target device. When the target device is not running and the time of not running exceeds the preset time, it means that the user does not need to use the target device temporarily, which also means that the electric energy stored in the energy storage unit 220 is not needed to power the bidirectional charging and discharging pile 300 temporarily. In this case, the control unit 280 of the present application will control the single-pole single-throw switch 252 to disconnect, thereby disconnecting the electrical connection between the energy storage unit 220 and the bidirectional charging and discharging pile 300, avoiding the unnecessary consumption of electric energy in the energy storage unit 220. In the process of the control unit 280 controlling the single-pole single-throw switch 252 to disconnect, the handle of the single-pole single-throw switch 252 will push the button 251 to reset, so that when the user needs to use the target device in an off-grid state later, just press the button 251 again.

[0018] Furthermore, in addition to the distribution line 210, the electric energy storage unit 220, the switch unit 250, the monitoring unit 260, the timing unit 270 and the control unit 280, the distribution box 200 is also provided with a charging circuit 230, the distribution line 210 is electrically connected to the charging circuit 230, and the charging circuit 230 is electrically connected to the electric energy storage unit 220. In the actual power distribution process, when in the grid-connected state, the distribution line 210 can transmit the electric energy provided by the power grid 100 to the charging circuit 230, and the charging circuit 230 can float charge the electric energy storage unit 220 based on the electric energy provided by the power grid 100, thereby ensuring that the electric energy storage unit 220 has sufficient electric energy to provide to the bidirectional charging and discharging pile 300 in the off-grid state, so that the bidirectional charging and discharging pile 300 can be started in the off-grid state. It is understandable that the charging circuit 230 performs floating charging on the energy storage unit 220 based on the electric energy provided by the power grid 100, which can ensure that the energy storage unit 220 is in a good health state, thereby increasing the service life of the energy storage unit 220.

[0019] As another example, Figure 3It is the third modular block diagram of the power distribution system. The electrical energy storage unit 220 includes two units, namely the first electrical energy storage unit 221 and the second electrical energy storage unit 222. The switch unit 250 includes two buttons 251 and two single-pole single-throw switches 252, which are the first button 2511, the second button 2512, the first single-pole single-throw switch 2521, and the second single-pole single-throw switch 2522 respectively. The two buttons 251 are both arranged on the outer wall of the distribution box 200, and the two single-pole single-throw switches 252 are both arranged inside the distribution box 200. The first electrical energy storage unit 221 is electrically connected to the bidirectional charging and discharging pile 300 through the first single-pole single-throw switch 2521, and the second electrical energy storage unit 222 is electrically connected to the bidirectional charging and discharging pile 300 through the second single-pole single-throw switch 2522. The first button 2511 is linked to the first handle of the first single-pole single-throw switch 2521, and the second button 2512 is linked to the second handle of the second single-pole single-throw switch 2522.

[0020] During the actual power distribution process, when the power grid 100 is powered off and enters the off-grid state accordingly, the user can press the first button 2511. During the process of the user pressing the first button 2511, the first button 2511 will push the first handle of the first single-pole single-throw switch 2521, aiming to close the first single-pole single-throw switch 2521, thus connecting the first electrical energy storage unit 221 and the bidirectional charging and discharging pile 300, enabling the bidirectional charging and discharging pile 300 to start based on the electrical energy stored in the first electrical energy storage unit 221, and delivering the electrical energy stored in the electric vehicle to the target device through the power distribution line 210; correspondingly, in the off-grid state, if power supply to the target device is no longer required, then the user can reset the first button 2511. During the process of the first button 2511 being reset, the first button 2511 will pull the first handle of the first single-pole single-throw switch 2521, ultimately causing the first single-pole single-throw switch 2521 to disconnect, thus disconnecting the electrical connection between the first electrical energy storage unit 221 and the bidirectional charging and discharging pile 300, making the bidirectional charging and discharging pile 300 unable to start and unable to deliver the electrical energy stored in the electric vehicle to the target device through the power distribution line 210.

[0021] Of course, when the power grid 100 is powered off and enters an off-grid state accordingly, the user can also press the second button 2512. In the process of the user pressing the second button 2512, the second button 2512 will push the second handle of the second single-pole single-throw switch 2522, and finally cause the second single-pole single-throw switch 2522 to close, thereby connecting the second power storage unit 222 and the bidirectional charging and discharging pile 300, so that the bidirectional charging and discharging pile 300 can be started based on the power stored in the second power storage unit 222, and the power stored in the electric vehicle is transmitted to the target through the distribution line 210. device; accordingly, in the off-grid state, if it is no longer necessary to power the target device, the user can reset the second button 2512. During the resetting process of the second button 2512, the second button 2512 will pull the second handle of the second single-pole single-throw switch 2522, eventually causing the second single-pole single-throw switch 2522 to disconnect, thereby disconnecting the electrical connection between the second energy storage unit 222 and the bidirectional charging and discharging pile 300, making it impossible for the bidirectional charging and discharging pile 300 to start, and unable to transmit the electric energy stored in the electric vehicle to the target device through the distribution line 210.

[0022] It can be understood that two energy storage units 220 are provided in this embodiment, the purpose of which is to use one of the energy storage units 220 as a backup, so as to avoid the problem that the other energy storage unit 220 cannot supply power to the bidirectional charging and discharging pile 300 when there is no power, failure or low power. As for the switching between the two energy storage units 220, it can be achieved by the user actively controlling the two buttons 251, or it can be done spontaneously, such as automatically controlled by the control unit 280. Please see the relevant instructions below for details.

[0023] Furthermore, consistent with the previous embodiment, the interior of the distribution box 200 is still provided with a monitoring unit 260, a timing unit 270 and a control unit 280, the timing unit 270 and the two single-pole single-throw switches 252 are electrically connected to the control unit 280, the control unit 280 is electrically connected to the monitoring unit 260, and the monitoring unit 260 is electrically connected to the target device and the two energy storage units 220. In the actual power distribution process, when the power grid 100 is powered off and enters an off-grid state, the monitoring unit 260 can obtain the power consumption information (such as voltage, current, power, etc.) of the target device, and the control unit 280 can determine whether the target device is running based on the power consumption information, and control the timing unit 270 to start timing when it is determined that the target device is not running. When the time counted by the timing unit 270 is greater than the preset time and the target device is still not running, the control unit 280 can control the closed single-pole single-throw switch 252 to open, thereby disconnecting the electrical connection between the corresponding energy storage unit 220 and the bidirectional charging and discharging pile 300. In this way, when the user temporarily does not need to use the target device, the unnecessary consumption of electric energy in the corresponding energy storage unit 220 can be avoided.

[0024] In addition, the monitoring unit 260 can also obtain the electrical parameters (such as current, voltage, power, and electricity quantity) of each electrical energy storage unit 220. When the target device is operating, the control unit 280 can control the closing and opening of each single-pole single-throw switch 252 according to the electrical parameters, so as to adjust the electrical energy storage unit 220 that supplies power to the bidirectional charging and discharging pile 300. Specifically, when the target device is operating, the control unit 280 can judge whether each electrical energy storage unit 220 is faulty, out of power, or has a low power level, etc., according to the electrical parameters. If the control unit 280 judges according to the electrical parameters that the electrical energy storage unit 220 that currently supplies power to the bidirectional charging and discharging pile 300 is out of power, has a low power level, or is faulty, then the control unit 280 can control the closing and opening of each single-pole single-throw switch 252, so as to switch another electrical energy storage unit 220 to supply power to the bidirectional charging and discharging pile 300. Preferably, the control unit 280 can switch another electrical energy storage unit 220 to supply power to the bidirectional charging and discharging pile 300 before the electrical energy storage unit 220 that currently supplies power to the bidirectional charging and discharging pile 300 runs out of power, that is, when the electrical energy storage unit 220 that currently supplies power to the bidirectional charging and discharging pile 300 has a low power level, so as to ensure the continuity of power supply to the bidirectional charging and discharging pile 300, which is equivalent to ensuring the continuity of power supply to the target device.

[0025] Furthermore, consistent with the previous embodiment, a charging circuit 230 is provided in the distribution box 200. However, different from the previous embodiment, a detection unit 240 is also provided in the distribution box 200. Both electrical energy storage units 220 are electrically connected to the detection unit 240, the detection unit 240 is electrically connected to the charging circuit 230, both electrical energy storage units 220 are respectively electrically connected to the charging circuit 230, and the charging circuit 230 is electrically connected to the power distribution line 210. During the actual power distribution process, when in the grid-connected state, the detection unit 240 can detect the electrical parameters (including but not limited to current, voltage, power, and electricity quantity) of both electrical energy storage units 220 in real time. The charging circuit 230 can select between the two electrical energy storage units 220 according to the electrical parameters, and perform floating charge on the selected electrical energy storage unit 220 based on the electrical energy provided by the power grid 100. Specifically, the charging circuit 230 can judge which of the two electrical energy storage units 220 has a lower power level according to the electrical parameters, so as to select the electrical energy storage unit 220 with a lower power level, and preferentially perform floating charge on the electrical energy storage unit 220 with a lower power level based on the electrical energy provided by the power grid 100. As time goes by, once the power level of the electrical energy storage unit 220 that is currently being floating-charged exceeds that of the other electrical energy storage unit 220, then the other electrical energy storage unit 220 becomes the one with a lower power level, that is, the charging circuit 230 will perform floating charge on the other electrical energy storage unit 220, and so on in a cycle.

[0026] In addition, the detection unit 240 can also be communicatively connected to an electronic terminal 400 held by a user (such as a mobile phone, a tablet computer, a smart wearable device, etc.). The detection unit 240 can send the electrical parameters of the two energy storage units 220 detected by itself to the electronic terminal 400 in the grid-connected state. The electronic terminal 400 can evaluate the health status of each energy storage unit 220 according to the electrical parameters and display the health status to the user. In this way, the user can clearly understand the health status of each energy storage unit 220, so as to facilitate the user to replace the energy storage unit 220 with poor health status in a timely manner. Preferably, the power distribution line 210 in the distribution box 200 can be electrically connected to the power grid 100 through a grid switch 500. Then, when the user replaces the energy storage unit 220, or replaces the electronic components in the distribution box 200 or the bidirectional charging and discharging pile 300, the grid switch 500 can be disconnected, so as to disconnect the electrical connection with the power grid 100, thereby ensuring the safety of the user when replacing the energy storage unit 220 or other electronic components.

[0027] The above embodiments are only the preferred implementations of the present application, and they are not the only limitations on the relevant content of the power distribution system; in this regard, those skilled in the art can make flexible settings according to the actual application scenarios on the basis of the above embodiments. It can be understood that through the implementation of the above embodiments of the present application, the energy storage unit 220 and the switch unit 250 are provided in the distribution box 200, and at the same time, the energy storage unit 220 is electrically connected to the bidirectional charging and discharging pile 300 through the switch unit 250. When the power grid 100 is powered on (i.e., in the grid-connected state), the energy storage unit 220 can store the electric energy provided by the power grid 100, and when the power grid 100 is powered off (i.e., in the off-grid state), the switch unit 250 can connect the energy storage unit 220 and the bidirectional charging and discharging pile 300 under the control of the user. In this case, the energy storage unit 220 can use the electric energy stored by itself to supply power to the bidirectional charging and discharging pile 300, so that the bidirectional charging and discharging pile 300 can be started in the off-grid state, and the electric energy stored in the electric vehicle can be transmitted to the target device outside through the power distribution line 210 to realize the power supply to the target device. It can be seen that in the present application, when the power grid 100 is powered off and enters the off-grid state accordingly, although the power grid 100 cannot supply power to the bidirectional charging and discharging pile 300, the energy storage unit 220 in the distribution box 200 can still supply power to the bidirectional charging and discharging pile 300, which enables the bidirectional charging and discharging pile 300 to still be normally started in the off-grid state. Then, the electric vehicle can be used as a power source and supply power to the target device outside through the bidirectional charging and discharging pile 300, thereby ensuring the discharging function of the bidirectional charging and discharging pile 300 in the off-grid state.

[0028] It should be noted that several embodiments shown above in this application are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. It should also be noted that in the textual description of this application, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of such an actual relationship or order between these entities or operations. Further, the term "comprising", "including" or any other corresponding variant is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes these elements, but may also include other elements not explicitly listed, or may also include elements inherent in such a process, method, article or device; and, without more limitations, elements defined by the statement "including one..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements.

[0029] In addition, by implementing several embodiments shown above in this application, those skilled in the art can implement or use this application. For the several embodiments shown above in this application, various modifications will be obvious to those skilled in the art. The general principles defined in this application can be implemented in other embodiments not shown without departing from the spirit or scope of this application. Therefore, this application will not be limited to the several embodiments shown above, but rather will conform to the broadest scope consistent with the principles and novel features disclosed in this application.

Claims

1. A power distribution system with off-grid power supply function, characterized in that: It includes a power grid, a distribution box and a bidirectional charging and discharging pile, wherein the distribution box is provided with a distribution line, an electric energy storage unit and a switch unit, the bidirectional charging and discharging pile and the electric energy storage unit are both electrically connected to the power grid through the distribution line, the bidirectional charging and discharging pile is electrically connected to the electric energy storage unit through the switch unit, and the bidirectional charging and discharging pile is used to electrically connect at least one electric vehicle, wherein: When in a grid-connected state, the distribution line transmits the electric energy provided by the grid to the electric energy storage unit and the bidirectional charging and discharging pile, the bidirectional charging and discharging pile is started based on the electric energy provided by the grid, and transmits the electric energy provided by the grid to the electric vehicle, or feeds the electric energy stored in the electric vehicle back to the grid through the distribution line, or transmits the electric energy stored in the electric vehicle to an external target device through the distribution line; when in an off-grid state, the switch unit connects the electric energy storage unit and the bidirectional charging and discharging pile under the control of the user, the bidirectional charging and discharging pile is started based on the electric energy stored in the electric energy storage unit, and transmits the electric energy stored in the electric vehicle to the target device through the distribution line.

2. The power distribution system according to claim 1, characterized in that: The switch unit includes a button and a single-pole single-throw switch, the button is arranged on the outer wall of the distribution box, the single-pole single-throw switch is arranged in the distribution box, the bidirectional charging and discharging pile is electrically connected to the electric energy storage unit through the single-pole single-throw switch, and the button is linked to the handle of the single-pole single-throw switch. When the user presses the button, the button pushes the handle and closes the single-pole single-throw switch to connect the electric energy storage unit and the bidirectional charging and discharging pile.

3. The power distribution system according to claim 2, characterized in that: The distribution box is also provided with a monitoring unit, a timing unit and a control unit, the timing unit is electrically connected to the control unit, the control unit is electrically connected to the single-pole single-throw switch, and the control unit is electrically connected to the target device through the monitoring unit, wherein: In the off-grid state, the monitoring unit obtains the power consumption information of the target device in real time, the control unit determines whether the target device is running according to the power consumption information, and controls the timing unit to start timing when it is determined that the target device is not running. When the time counted by the timing unit is greater than a preset time and the target device is not running, the control unit controls the single-pole single-throw switch to disconnect, and during the process of disconnecting the single-pole single-throw switch, the handle pushes the button to reset.

4. The power distribution system according to claim 1, characterized in that: The electric energy storage unit includes two, namely a first electric energy storage unit and a second electric energy storage unit, the switch unit includes two buttons and two single-pole single-throw switches, the two buttons are respectively a first button and a second button, the two single-pole single-throw switches are respectively a first single-pole single-throw switch and a second single-pole single-throw switch, the two buttons are both arranged on the outer wall of the distribution box, the two single-pole single-throw switches are both arranged inside the distribution box, the first electric energy storage unit is electrically connected to the bidirectional charging and discharging pile through the first single-pole single-throw switch, the second electric energy storage unit is electrically connected to the bidirectional charging and discharging pile through the second single-pole single-throw switch, the first button is linked to the first handle of the first single-pole single-throw switch, and the second button is linked to the second handle of the second single-pole single-throw switch; When the user presses the first button, the first button pushes the first handle and closes the first single-pole single-throw switch to connect the first energy storage unit and the bidirectional charge and discharge pile, and the bidirectional charge and discharge pile is started based on the electric energy stored in the first energy storage unit; when the user presses the second button, the second button pushes the second handle and closes the second single-pole single-throw switch to connect the second energy storage unit and the bidirectional charge and discharge pile, and the bidirectional charge and discharge pile is started based on the electric energy stored in the second energy storage unit.

5. The power distribution system according to claim 4, characterized in that: The distribution box is also provided with a monitoring unit, a timing unit and a control unit, the timing unit and the two single-pole single-throw switches are electrically connected to the control unit, the target device and the two electric energy storage units are electrically connected to the monitoring unit, and the monitoring unit is electrically connected to the control unit, wherein: In the off-grid state, the monitoring unit obtains power consumption information of the target device, the control unit determines whether the target device is running according to the power consumption information, and controls the timing unit to start timing when it is determined that the target device is not running, and when the time counted by the timing unit is greater than a preset time and the target device is not running, the control unit controls the closed single-pole single-throw switch to open; and, the monitoring unit obtains electrical parameters of the two energy storage units, and the control unit regulates the closing and opening of each single-pole single-throw switch according to the electrical parameters when the target device is running, so as to adjust the energy storage unit that supplies power to the bidirectional charging and discharging pile.

6. The power distribution system according to claim 1, characterized in that: A charging circuit is also provided in the distribution box, and the energy storage unit is electrically connected to the distribution line through the charging circuit. In the grid-connected state, the distribution line transmits the electric energy provided by the grid to the charging circuit, and the charging circuit performs float charging on the energy storage unit based on the electric energy provided by the grid.

7. The power distribution system according to claim 6, characterized in that: The electric energy storage units include two, and a detection unit is also provided in the distribution box. The two electric energy storage units are electrically connected to the detection units respectively, and the detection unit is electrically connected to the charging circuit, wherein: In the grid-connected state, the detection unit detects the electrical parameters of the two energy storage units in real time, the charging circuit selects between the two energy storage units according to the electrical parameters, and performs float charging on the selected energy storage unit based on the electric energy provided by the power grid.

8. The power distribution system according to claim 7, characterized in that: It also includes an electronic terminal held by the user, which is communicatively connected to the detection unit, for receiving the electrical parameters sent by the detection unit, evaluating the health status of each of the electric energy storage units according to the electrical parameters, and displaying the health status to the user.

9. The power distribution system according to claim 1, characterized in that: A power grid switch is also included, and the power grid switch is electrically connected between the power grid and the power distribution line.

10. The power distribution system according to claim 1, characterized in that: The electric energy storage unit includes a single storage battery or a storage battery pack composed of a plurality of the storage batteries.

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