High-voltage box power supply system and energy storage system

Abstract

The utility model relates to the technical field of energy storage, in particular to a high-voltage box power supply system and an energy storage system.The high-voltage box power supply system is applied to the energy storage system and comprises a power supply and a plurality of high-voltage boxes; the power supply is electrically connected with one of the plurality of high-voltage boxes; and the plurality of high-voltage boxes are electrically connected with one another in sequence, so that the power supply supplies power to the plurality of high-voltage boxes. The high-voltage box power supply system provided by the utility model aims to simplify the arrangement of the distribution line between the power supply and the high-voltage box; the provided energy storage system aims to simplify the arrangement of distribution lines between the power distribution cabinet and the high-voltage box, reduce the number of reserved power interfaces of the power distribution cabinet, reduce the size of the power distribution cabinet, and better utilize the limited space of the container.

Description

Technical Field

[0001] The present disclosure relates to the field of energy storage technology, and in particular to a high-voltage box power supply system and an energy storage system. Background Art

[0002] In an energy storage system, a battery pack contains several battery cells connected in series. Several battery packs are connected in series to form a battery cluster, which is electrically connected to a high-voltage box. The battery cluster's main function is to store and provide electrical energy, while the high-voltage box's main function is to connect or disconnect the system's main electrical circuit.

[0003] The high-voltage box is a device that integrates various high-voltage components. It is used to ensure the transmission of system power and electrical energy, and to detect insulation faults, circuit faults, grounding faults and high-voltage faults of the entire high-voltage system at any time.

[0004] However, a plurality of battery clusters and a plurality of high-voltage boxes are integrated in an energy storage container, which results in a large number of distribution lines between the plurality of battery clusters and the plurality of high-voltage boxes and complicated wiring of the distribution lines. Utility Model Content

[0005] The present disclosure provides a high-voltage box power supply system and an energy storage system, which aim to simplify the arrangement of distribution lines between the power supply and the high-voltage box.

[0006] In a first aspect, the present disclosure provides a high-voltage box power supply system, which is applied to an energy storage system, including: a power supply, and multiple high-voltage boxes; the power supply is electrically connected to one of the multiple high-voltage boxes; and the multiple high-voltage boxes are electrically connected to each other in sequence so that the power supply can supply power to the multiple high-voltage boxes.

[0007] In some embodiments, each of the multiple high-voltage boxes includes: a first power supply interface and a second power supply interface; the multiple high-voltage boxes electrically connected to each other in sequence include: a first-level high-voltage box, a second-level high-voltage box, and so on to the N-th-level high-voltage box; wherein the second power supply interface of the i-th-level high-voltage box is connected to the first power supply interface of the i+1-th-level high-voltage box; N is an integer greater than 0, and i is any integer between 1 and N.

[0008] In some embodiments, the i-th stage high-voltage box includes at least one high-voltage box.

[0009] In some embodiments, the power supply is connected to the first power supply interface of the first-level high-voltage box and / or to the second power supply interface of the N-level high-voltage box.

[0010] In some embodiments, each high-voltage box also includes: a box structure, with a first power supply interface and a second power supply interface provided on the outside, and the first power supply interface and the second power supply interface are electrically connected inside the high-voltage box; a circuit breaker, connected to the first power supply interface inside the box, and configured to conduct the power supply path of the first power supply interface and the second power supply interface based on a control signal; a switching power supply, connected to the circuit breaker inside the box; and a main control board, connected to the switching power supply inside the box.

[0011] In a second aspect, the present disclosure provides an energy storage system, comprising: at least one power supply, a distribution cabinet, and multiple high-voltage boxes; the distribution cabinet is used for electrical connection between the power supply and the high-voltage box, and the distribution cabinet includes at least one distribution interface, and the distribution interface is connected to the power supply in a one-to-one correspondence; multiple distribution lines are formed between at least one power supply and the multiple high-voltage boxes, and at least one of the multiple distribution lines is based on the high-voltage box power supply system of the system of the first aspect above.

[0012] In some embodiments, the number of power distribution interfaces is less than the number of high-voltage boxes.

[0013] In some embodiments, each of the plurality of high-voltage boxes includes a first power supply interface and a second power supply interface, and the first power supply interface and the second power supply interface have different specifications.

[0014] In some embodiments, each of the plurality of high-voltage boxes includes a first power supply interface and a second power supply interface, and the first power supply interface and the second power supply interface are respectively disposed on opposite sides of the box structure.

[0015] In some embodiments, the energy storage system also includes: a first type of power cable, used for power distribution connection between the power distribution interface and the high-voltage box; a second type of power cable, used for power distribution connection between multiple high-voltage boxes; the specifications of the first type of power cable are not less than the specifications of the second type of power cable.

[0016] The high-voltage box power supply system provided in this embodiment realizes power supply of multiple high-voltage boxes by one power supply through the electrical connection relationship between the high-voltage boxes, reduces the connection cables between the power supply and the high-voltage boxes, and is more convenient for wiring when it is set inside the energy storage container.

[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A schematic structural diagram of a high-voltage box power supply system provided in an embodiment of the present disclosure;

[0020] Figure 2 A schematic diagram of the structure of multiple interconnected high-voltage boxes provided in an embodiment of the present disclosure;

[0021] Figure 3 A schematic diagram of the structure of a high-voltage box power supply system under a specific high-voltage box structure provided in an embodiment of the present disclosure;

[0022] Figure 4 A schematic structural diagram of a high-voltage box power supply system with parallel high-voltage boxes provided in an embodiment of the present disclosure;

[0023] Figure 5 A schematic diagram of the structure of the energy storage system provided in an embodiment of the present disclosure;

[0024] Among them, the high-voltage box power supply system 10, the power supply 100, the high-voltage box 200, the switching power supply 300, the main control board 400, the energy storage system 20, and the power distribution cabinet 500;

[0025] First power supply interface A, second power supply interface B, circuit breaker K, contactor J, fuse F, Hall sensor H. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0027] In the description of this disclosure, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being described. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this disclosure, "plurality" means two or more, unless otherwise specifically defined.

[0028] In this disclosure, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this disclosure as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the present disclosure. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art will recognize that the present disclosure can be implemented without these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present disclosure with unnecessary details. Therefore, the present disclosure is not intended to be limited to the embodiments shown, but is to be consistent with the widest scope consistent with the principles and features disclosed herein.

[0029] At the same time, this disclosure uses specific terms to describe the embodiments of the present disclosure. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic associated with at least one embodiment of the present disclosure. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or more in different places in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the present disclosure may be appropriately combined.

[0030] Similarly, it should be noted that, in order to simplify the presentation of this disclosure and thus facilitate understanding of one or more embodiments, the foregoing descriptions of the embodiments of this disclosure sometimes combine multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of this disclosure requires more features than those recited in the claims. In fact, an embodiment may have fewer features than all of the features of a single embodiment disclosed above.

[0031] In some embodiments, numbers are used to describe the quantity of components and attributes. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise stated, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the description and claims are approximate values, which may change according to the required characteristics of individual embodiments. In some embodiments, the numerical parameters should consider specifying significant digits and adopting the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present disclosure are approximate values, in specific embodiments, the settings of such numerical values ​​are as accurate as possible within the feasible range.

[0032] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, and documents, cited in this disclosure is hereby incorporated by reference in its entirety, except for any application history that is inconsistent with or conflicts with this disclosure, and except for any document (currently or later appended to this disclosure) that limits the broadest scope of the claims of this disclosure. It should be noted that if there is any inconsistency or conflict between the descriptions, definitions, and / or terminology in the accompanying materials and the examples in this disclosure, the descriptions, definitions, and / or terminology in this disclosure will control.

[0033] Related technologies often use a circuit connection method where one power supply is connected to a high-voltage box. However, this power supply requires a reserved power interface in the distribution cabinet to complete the power distribution connection to the high-voltage box. Energy storage containers integrate multiple power supplies, requiring more power interfaces in the distribution cabinet to complete the power distribution connection. This increase in the number of power interfaces in the distribution cabinet also increases its size. Furthermore, the limited space inside the energy storage container makes wiring to the distribution cabinet difficult due to the excessive number of wiring harnesses connecting to the distribution cabinet.

[0034] To solve this technical problem, an embodiment of the present disclosure provides a high-voltage box power supply system, which aims to simplify the setting of distribution lines between the power supply and the high-voltage box.

[0035] The high-voltage box power supply system provided in this embodiment is described in detail below with reference to the accompanying drawings, as follows:

[0036] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the high-voltage box power supply system provided in this embodiment. The high-voltage box power supply system 10 provided in this embodiment is applied to an energy storage system and includes a power supply 100 and multiple high-voltage boxes 200. The power supply 100 is electrically connected to one of the multiple high-voltage boxes 200, and the multiple high-voltage boxes are electrically connected to each other in sequence, so that the power supply 100 can supply power to the multiple high-voltage boxes 200.

[0037] Specifically, assume that multiple high-voltage boxes 200 are: high-voltage box 1, high-voltage box 2, high-voltage box 3, ..., high-voltage box N. The multiple high-voltage boxes 200 are electrically connected to each other in sequence, i.e., high-voltage box 1 is electrically connected to high-voltage box 2, high-voltage box 2 is electrically connected to high-voltage box 3, ..., high-voltage box i is electrically connected to high-voltage box i+1, ..., high-voltage box N-1 is electrically connected to high-voltage box N. Where N is an integer greater than 0, and i is any integer between 1 and N. The power supply 100 is electrically connected to high-voltage box 1 to supply power to high-voltage box 1, the power supply 100 relays power from high-voltage box 1 to supply power to high-voltage box 2, the power supply 100 relays power from high-voltage box 2 to supply power to high-voltage box 3, ..., the power supply 100 relays power from high-voltage box i to supply power to high-voltage box i+1, ..., the power supply 100 relays power from high-voltage box N-1 to supply power to high-voltage box N.

[0038] Based on the above, it can be seen that the high-voltage box power supply system 10 provided in this embodiment realizes the power supply of multiple high-voltage boxes 200 by one power supply 100 through the electrical connection relationship between the high-voltage boxes 200, reducing the connecting cables between the power supply 100 and the high-voltage box 200, and is more conducive to wiring when arranged inside the energy storage container.

[0039] In some embodiments, the power supply 100 is based on a battery pack or battery cluster.

[0040] In some embodiments, reference Figure 2 , Figure 2 This is a schematic diagram of the interconnection structure of multiple high-voltage boxes provided in this embodiment. Each of the multiple high-voltage boxes 200 includes: a first power supply interface A and a second power supply interface B. The multiple high-voltage boxes 200 electrically connected to each other in sequence include: a first-level high-voltage box, a second-level high-voltage box, and so on until the N-th level high-voltage box; wherein the second power supply interface B of the i-th level high-voltage box is connected to the first power supply interface A of the i+1-th level high-voltage box, that is, the multiple high-voltage boxes 200 are arranged and connected in a daisy chain. Wherein, N is an integer greater than 0, and i is any integer between 1 and N. The high-voltage box 200 provided in this embodiment is provided with a first power supply interface A and a second power supply interface B to interconnect multiple high-voltage boxes, thereby realizing power supply of multiple high-voltage boxes 200 by a single power supply 100.

[0041] for Figure 2For example, in one example, the power supply 100 is connected to the first power supply interface A of the first-level high-voltage box to power multiple high-voltage boxes 200. In another example, the power supply 100 is connected to the second power supply interface B of the N-level high-voltage box to power multiple high-voltage boxes 200. In yet another example, the power supply 100 is connected to the first power supply interface A of the first-level high-voltage box and the second power supply interface B of the N-level high-voltage box to power multiple high-voltage boxes 200. The power supply 100 connected to the first power supply interface A of the first-level high-voltage box and the second power supply interface B of the N-level high-voltage box can be the same power supply 100 or different power supplies 100.

[0042] refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of the high-voltage box power supply system under the specific high-voltage box structure provided in this embodiment. For the high-voltage box 200 provided in this embodiment, the high-voltage box 200 includes a box structure, and a first power supply interface A and a second power supply interface B are provided on the outside of the box structure. The first power supply interface A and the second power supply interface B are electrically connected inside the high-voltage box 200. The circuit breaker K is connected to the first power supply interface A inside the box. Since the first power supply interface A and the second power supply interface B are electrically connected inside the high-voltage box 200, the circuit breaker K is also connected to the second power supply interface B inside the box. The circuit breaker K is configured to conduct the power supply path of the first power supply interface A and the second power supply interface B based on a control signal. The switching power supply 300 is connected to the circuit breaker K inside the box; the main control board 400 is connected to the switching power supply inside the box.

[0043] Specifically, the circuit breaker K serves as a switch for the connection path between the high-voltage box 200 and the power supply 100, and plays a master control role. When the circuit breaker K is closed, the electric energy provided by the power supply 100 can flow through the high-voltage box 200; when the circuit breaker K is disconnected, the power supply 100 cannot supply power to the high-voltage box 200.

[0044] The switching power supply 300 is used for power conversion within the high-voltage box 200 to convert the voltage value provided by the power supply 100 into a voltage value that the high-voltage box 200 can adapt to. In one example, the switching power supply 300 can be configured based on a DC / DC isolation circuit. The DC / DC isolation circuit can step up or down the voltage value provided by the power supply 100, thereby obtaining a voltage value that the high-voltage box 200 can adapt to.

[0045] In one example, the main control board 400 is used to implement the function of a battery management system (BMS). Specifically, the main control board 400 controls the on and off of the contactor J to turn on the corresponding functional circuit.

[0046] It should be noted that the energy storage system is an alternating current transmission system. Therefore, the connection cable between the power supply 100 and the high-voltage box 200 and the transmission cable between the high-voltage boxes 200 are two-wire transmission cables to adapt to the transmission of alternating current.

[0047] It should also be noted that Figure 3 The examples do not limit the locations of the first power supply interface A and the second power supply interface B. In some embodiments, the first power supply interface A and the second power supply interface B are located on opposite sides of the box structure. By locating the first power supply interface A and the second power supply interface B on two opposite sides of the box structure of the high-voltage box 200, interconnection wiring between the high-voltage boxes 200 is facilitated, and locating them inside the energy storage container further facilitates wiring.

[0048] In some embodiments, the first power supply interface A and the second power supply interface B both meet the IP65 protection level, so that the entire high-voltage box 200 meets the IP65 protection level.

[0049] In some embodiments, the high-voltage box 200 also includes a fuse F. The main function of the fuse F in the high-voltage box 200 is to protect the circuit from damage caused by overload or short-circuit current. Its working principle is based on the thermal effect of current. When the current passing through the fuse F exceeds its rated value, the temperature of the internal metal conductor rises rapidly. After reaching a certain temperature, it begins to melt, forming a circuit break, thereby cutting off the large current. In one example, the basic structure of the fuse F includes three parts: a melt, a shell, and a support. Among them, the melt is a key component that controls the fusing characteristics. The material is usually a low-melting-point material such as lead and lead alloy, or a high-melting-point material such as copper and silver. The melt remains in a solid state when the circuit is operating normally. When an overload or short circuit occurs, the current exceeds the melting point of the melt, causing the melt to melt and vaporize, resulting in a fracture, thereby achieving circuit protection.

[0050] In some embodiments, the high-voltage box 200 also includes a Hall sensor H, which uses the Hall effect to measure the strength of the magnetic field. When a conductor moves in a magnetic field perpendicular to the direction of current, an electromotive force (i.e., Hall voltage) is generated on the side of the conductor, and this voltage is proportional to the strength of the magnetic field. Therefore, by measuring the Hall voltage, the existence of the magnetic field and its changes can be accurately detected. In the high-voltage box 200, the Hall sensor H is often used for measuring current and voltage. In one example, some high-performance Hall effect current sensors, such as the CC6920B, integrate a high-precision, low-noise linear Hall circuit and a low-impedance main current conductor, which can provide a measurement range of up to 50A and have the characteristics of high bandwidth and fast response.

[0051] In one specific application scenario, the control signal for controlling the on / off state of circuit breaker K is provided by the controller of the product to which the high-voltage phase power supply system 10 belongs, so that the controller can power on or off the high-voltage box 200. In another specific application scenario, circuit breaker K is configured as a maintenance switch (Manual Service Disconnect, MSD). The maintenance switch is a manual power-off device for the high-voltage system of a new energy electric vehicle. Its main function is to disconnect the power supply of the high-voltage system by unplugging or operating the switch, thereby achieving electrical isolation and ensuring the safety of maintenance personnel.

[0052] In some embodiments, the i-th level high voltage box includes at least one high voltage box 200. Specifically, refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of the high-voltage box power supply system with parallel high-voltage boxes provided in this embodiment. Figure 4 In the embodiment, the second-level high-voltage box and the N-level high-voltage box both include three high-voltage boxes 200, and the three high-voltage boxes are connected to the next-level high-voltage box through the same connecting cable. This embodiment further expands the connection method of the high-voltage boxes in the high-voltage box power supply system 10 provided in this embodiment by setting parallel high-voltage boxes 200.

[0053] In some embodiments, the specifications of the first power supply interface A and the second power supply interface B are different. Accordingly, the connector specifications of the connecting cables connected to the first power supply interface A and the second power supply interface B are different. By setting interfaces and connector specifications of different specifications, it is easier to detect the correctness of the wiring and facilitate the maintenance of the high-voltage box power supply system 10.

[0054] For the high-voltage box power supply system 10 provided in this embodiment, it is assumed that there are N high-voltage boxes, and the current required by each high-voltage box is I, and the voltage drop of the current I on the connecting cable between the power supply 100 and the high-voltage box 200 is V; due to the setting of the daisy chain structure, the current on the connecting cable between the power supply 100 and the high-voltage box 200 is I*N at this time, and accordingly, the voltage drop V on the connecting cable between the power supply 100 and the high-voltage box 200 will increase, thereby reducing the power supply voltage received by the high-voltage box 200; however, due to the setting of the switching power supply 300 inside the high-voltage box 200, the input voltage of the switching power supply 300 is a wide range, and the received power supply voltage can be boosted, which can avoid the impact of the voltage drop problem on the power supply circuit.

[0055] In some embodiments, the power supply lines of the high-voltage box power supply system 10 include a first type of power line and a second type of power line, wherein the first type of power line is used for the power distribution connection between the power supply 100 and the high-voltage box 200, and the second type of power line is used for the power distribution connection between multiple high-voltage boxes, and the specifications of the first type of power line are not less than those of the second type of power line. Specifically, based on the above content, it can be seen that the current flowing through the first type of power line is greater than the current flowing through the second type of power line. Therefore, setting the specifications of the first type of power line to be no less than those of the second type of power line can ensure the power supply safety of the high-voltage box power supply system 10.

[0056] To sum up, the high-voltage box power supply system 10 provided in this embodiment realizes the power supply of multiple high-voltage boxes 200 by one power supply 100 through the electrical connection relationship between the high-voltage boxes 200, reduces the connecting cables between the power supply 100 and the high-voltage box 200, and is more conducive to wiring when arranged inside the energy storage container.

[0057] It should be noted that, in the absence of conflict, the features disclosed in the high-voltage box power supply system 10 provided in the above embodiments can be randomly combined to obtain a new embodiment of the high-voltage box power supply system 10.

[0058] Another embodiment of the present disclosure provides an energy storage system, which aims to simplify the distribution line setting between the distribution cabinet and the high-voltage box, reduce the power supply interfaces required to be reserved in the distribution cabinet, reduce the size of the distribution cabinet, and better utilize the limited space in the container.

[0059] refer to Figure 5 , Figure 5 This is a structural diagram of the energy storage system provided in this embodiment. The energy storage system 20 includes: at least one power supply 100, a distribution cabinet 500 and multiple high-voltage boxes 200; the distribution cabinet 500 is used for electrical connection between the power supply 100 and the high-voltage box 200, and the distribution cabinet 500 includes at least one distribution interface, which is connected to the power supply 100 in a one-to-one correspondence; multiple distribution lines are formed between the at least one power supply 100 and the multiple high-voltage boxes 200, and at least one of the multiple distribution lines is based on the high-voltage box power supply system 10 of the above embodiment.

[0060] Specifically, the distribution cabinet 500 is used to electrically connect the power supply 100 and the high-voltage box 200, and the distribution interface in the distribution cabinet 500 is connected to the power supply 100 accordingly, that is, the number of distribution interfaces integrated in the distribution cabinet 500 is the number of power supplies 100 provided in the energy storage container, and the high-voltage box 200 is connected to the power supply by connecting the distribution interface.

[0061] The energy storage system provided in this embodiment includes both one-to-one power supply from the power supply 100 to the high-voltage box 200 and one-to-many power supply from the power supply 100 to the high-voltage box 200. As previously mentioned, the high-voltage box power supply system 10 reduces the number of connecting cables between the power supply 100 and the high-voltage box 200, and its placement within the energy storage container facilitates wiring. Furthermore, the one-to-many power supply between the power supply 100 and the high-voltage box 200 can reduce the number of power supplies 100, thereby reducing the number of power interfaces required in the distribution cabinet and reducing the size of the distribution cabinet to better utilize the limited space in the container.

[0062] In some embodiments, the power supply 100 is based on a battery pack or battery cluster.

[0063] In some embodiments, the number of power distribution interfaces is smaller than the number of high-voltage boxes to ensure a one-to-many power connection between the power supply 100 and the high-voltage box 200 in the energy storage system 20 , thereby reducing the number of power supplies 100 .

[0064] In some embodiments, the specifications of the first power supply interface A and the second power supply interface B are different. Accordingly, the connector specifications of the connecting cables connected to the first power supply interface A and the second power supply interface B are different. By setting the interfaces and connector specifications of different specifications, it is easier to detect the correctness of the wiring, which facilitates the maintenance of the energy storage system 20.

[0065] In some embodiments, each of the multiple high-voltage boxes 200 includes a first power supply interface A and a second power supply interface B, and the first power supply interface A and the second power supply interface B are respectively arranged on opposite sides of the box structure. By arranging the first power supply interface A and the second power supply interface B twice on opposite sides of the box structure of the high-voltage box 200, interconnection and routing between the high-voltage boxes 200 are facilitated, and arranging them inside the energy storage container further facilitates wiring.

[0066] Since the energy storage system 20 includes a high-voltage box power supply system 10, it is assumed that there are N high-voltage boxes in the high-voltage box power supply system 10, and the current required by each high-voltage box is I, and the voltage drop of the current I on the connecting cable between the power supply 100 and the high-voltage box 200 is V; due to the setting of the daisy chain structure, the current on the connecting cable between the power supply 100 and the high-voltage box 200 is I*N at this time, and accordingly, the voltage drop V on the connecting cable between the power supply 100 and the high-voltage box 200 will increase, thereby reducing the power supply voltage received by the high-voltage box 200; however, due to the setting of the switching power supply 300 inside the high-voltage box 200, the input voltage of the switching power supply 300 is wide, and the received power supply voltage can be boosted, which can avoid the impact of the voltage drop problem on the power supply circuit.

[0067] In some embodiments, the power supply lines of the energy storage system 20 include a first type of power line and a second type of power line, wherein the first type of power line is used for the power distribution connection between the power distribution interface and the high-voltage box 200, and the second type of power line is used for the power distribution connection between multiple high-voltage boxes, and the specifications of the first type of power line are not less than those of the second type of power line. Specifically, based on the above content, it can be seen that the current flowing through the first type of power line is greater than the current flowing through the second type of power line. Therefore, setting the specifications of the first type of power line to be no less than those of the second type of power line can ensure the power supply safety of the high-voltage box power supply system 10.

[0068] In some embodiments, the first power supply interface A and the second power supply interface B both meet the IP65 protection level, so that the entire high-voltage box 200 meets the IP65 protection level, and the energy storage system meets the IP65 protection level.

[0069] To sum up, for the energy storage system provided in this embodiment, the one-to-many power supply method between the power supply 100 and the high-voltage box 200 can reduce the number of power supplies 100, thereby reducing the power interfaces required to be reserved in the distribution cabinet and reducing the size of the distribution cabinet to better utilize the limited space in the container.

[0070] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above and will not be repeated here.

[0071] While the basic concepts have been described above, it will be apparent to those skilled in the art that the detailed disclosure is merely illustrative and does not limit the present disclosure. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and revisions to the present disclosure. Such modifications, improvements, and revisions are suggested in the present disclosure and remain within the spirit and scope of the exemplary embodiments of the present disclosure.

[0072] The above is a detailed introduction to a power conversion circuit and a power supply system provided by an embodiment of the present disclosure. Specific examples are used herein to illustrate the principles and implementation methods of the present disclosure. The description of the above embodiments is only used to help understand the method of the present disclosure and its core idea. At the same time, for those skilled in the art, according to the ideas of the present disclosure, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present disclosure.

Claims

1. A high-voltage box power supply system, applied to an energy storage system, characterized in that: include: Power supply, and multiple high-voltage boxes; The power supply is electrically connected to one of the high-voltage boxes; The plurality of high-voltage boxes are electrically connected to each other in sequence, so that the power supply can supply power to the plurality of high-voltage boxes.

2. The high-voltage box power supply system according to claim 1, characterized in that: include: Each of the plurality of high-voltage boxes comprises: a first power supply interface and a second power supply interface; The plurality of high-voltage boxes electrically connected to each other in sequence include: a first-stage high-voltage box, a second-stage high-voltage box, and so on to an N-stage high-voltage box; The second power supply interface of the i-th level high-voltage box is connected to the first power supply interface of the i+1-th level high-voltage box; N is an integer greater than 0, and i is any integer between 1 and N.

3. The high-voltage box power supply system according to claim 2, characterized in that: The i-th level high-voltage box includes at least one high-voltage box.

4. The high-voltage box power supply system according to claim 2, characterized in that: The power supply is connected to the first power supply interface of the first-level high-voltage box and / or to the second power supply interface of the N-level high-voltage box.

5. The high-voltage box power supply system according to claim 2, characterized in that: Each of the high-voltage boxes also includes: The box structure is provided with the first power supply interface and the second power supply interface on the outside, and the first power supply interface and the second power supply interface are electrically connected inside the high-voltage box; a circuit breaker connected to the first power supply interface inside the box and configured to conduct a power supply path between the first power supply interface and the second power supply interface based on a control signal; A switching power supply connected to the circuit breaker inside the box; The main control board is connected to the switching power supply inside the box.

6. An energy storage system, characterized in that: include: At least one power supply, a power distribution cabinet, and multiple high-voltage boxes; The power distribution cabinet is used for the electrical connection between the power supply and the high-voltage box, and the power distribution cabinet includes at least one power distribution interface, and the power distribution interface is connected to the power supply in a one-to-one correspondence; A plurality of distribution lines are formed between at least one power supply and a plurality of high-voltage boxes, and at least one of the plurality of distribution lines is arranged based on the high-voltage box power supply system according to any one of claims 1 to 5.

7. The energy storage system according to claim 6, characterized in that: The number of the power distribution interfaces is less than the number of the high-voltage boxes.

8. The energy storage system according to claim 6 or 7, characterized in that: Each of the plurality of high-voltage boxes includes a first power supply interface and a second power supply interface, and the first power supply interface and the second power supply interface have different specifications.

9. The energy storage system according to claim 6 or 7, characterized in that: Each of the plurality of high-voltage boxes includes: a first power supply interface and a second power supply interface, and the first power supply interface and the second power supply interface are respectively arranged on opposite sides of the box structure.

10. The energy storage system according to claim 6 or 7, characterized in that: Also includes: The first type of power cable is used for power distribution connection between the power distribution interface and the high-voltage box; The second type of power line is used for power distribution connection between multiple high-voltage boxes; The specifications of the first type of power cord are not less than those of the second type of power cord.

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