Energy storage electrical box and energy storage system

Abstract

The utility model discloses an energy storage electrical box and an energy storage system, and relates to the technical field of energy storage, and the energy storage electrical box comprises a box body which is provided with an installation cavity; the main circuit board is arranged on the box body; the electrical part is arranged in the mounting cavity and is electrically connected with the main circuit board to form a main power-on loop; the sampling plug-in is arranged on the main circuit board and is electrically connected with the main power-on loop; the control panel is arranged in the mounting cavity, the control panel is connected with the sampling plug-in unit through a sampling wire harness, and the sampling wire harness is connected with the sampling plug-in unit in an inserted mode. According to the technical scheme of the utility model, the wiring difficulty and the occupied space of the high-voltage sampling wire harness in the energy storage system are reduced.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to an energy storage electrical box and an energy storage system. Background Technology

[0002] With the rapid development of new energy power generation, smart grids, and electric vehicles, energy storage systems, as the core unit of energy conversion and management, have attracted much attention regarding their safety and reliability. In energy storage systems, high-voltage sampling is a crucial step in achieving battery status monitoring, energy balancing, and system protection. This typically requires real-time acquisition of the main circuit's voltage or current signals via high-voltage sampling harnesses. Currently, high-voltage sampling harnesses in energy storage systems generally use terminals for physical connection to the main circuit, which is cumbersome and time-consuming. Furthermore, it requires ample wiring space, resulting in insufficient compactness within the electrical cabinet and hindering miniaturized equipment design. Utility Model Content

[0003] The main purpose of this utility model is to provide an energy storage electrical box and energy storage system, which aims to reduce the wiring difficulty and space occupation of the high-voltage sampling harness in the energy storage system.

[0004] To achieve the above objectives, this utility model provides an energy storage electrical box, which includes:

[0005] The enclosure has a mounting cavity;

[0006] The main circuit board is located in the enclosure;

[0007] Electrical components are located in the mounting cavity and are electrically connected to the main circuit board to form a main power circuit;

[0008] A sampling plug-in is located on the main circuit board and electrically connected to the main power circuit; and

[0009] A control board is located in the mounting cavity. The control board and the sampling plug are connected by a sampling harness, and the sampling harness and the sampling plug are plugged in.

[0010] In one embodiment, the energy storage electrical box further includes:

[0011] A power module is disposed in the mounting cavity, and the control board and the main circuit board are disposed on adjacent sides of the power module;

[0012] A high-voltage power extraction plug is located on the main circuit board and is electrically connected to the main power circuit;

[0013] A low-voltage power supply plug is located on the main circuit board, and the low-voltage power supply plug and the high-voltage power take-off plug are spaced apart along the length of the housing. The sampling plug is located on the side of the high-voltage power take-off plug facing away from the power module. The power module is electrically connected to the high-voltage power take-off plug and the low-voltage power supply plug. The control board is electrically connected to the low-voltage power supply plug.

[0014] In one embodiment, the energy storage electrical box further includes a power fuse disposed on the main circuit board and located between the high-voltage power extraction plug and the sampling plug, the power fuse being electrically connected to the high-voltage power extraction plug and the main power circuit.

[0015] In one embodiment, the low-voltage power supply module includes a first power supply module and a second power supply module spaced apart along the width direction of the enclosure. The first power supply module and the second power supply module are disposed on the main circuit board and electrically connected through the internal circuit of the main circuit board. The first power supply module is electrically connected to the power module, and the second power supply module is electrically connected to the control board. The number of output channels of the second power supply module is greater than or equal to the number of output channels of the first power supply module.

[0016] In one embodiment, the main circuit board includes a first main board, a second main board, and a main positive relay and a main negative relay electrically connected to the first main board and the second main board. The power module, the first main board, and the second main board are arranged sequentially along the length of the enclosure. The main positive relay and the main negative relay are spaced apart along the width of the enclosure. The electrical components include positive electrical components and negative electrical components. The positive electrical components, the main positive relay, the first main board, and the second main board are electrically connected to form a positive circuit. The negative electrical components, the main negative relay, the first main board, and the second main board are electrically connected to form a negative circuit. The positive circuit and the negative circuit form the main power-on circuit. The sampling plug-in is electrically connected to the positive circuit and the negative circuit.

[0017] In one embodiment, the sampling plug-in includes a front-end sampling plug-in disposed on the first motherboard and a rear-end sampling plug-in disposed on the second motherboard. The front-end sampling plug-in is electrically connected to the input terminal of the main positive relay and the input terminal of the main negative relay, and the front-end sampling plug-in is located on the side of the power fuse facing away from the power module. The rear-end sampling plug-in is electrically connected to the output terminal of the main positive relay and the output terminal of the main negative relay.

[0018] In one embodiment, the energy storage electrical box further includes a control plug-in, a heating relay, and a pre-charge relay disposed on the second main board. The heating relay and the pre-charge relay are spaced apart along the width direction of the box. The rear sampling plug-in is located on the side of the heating relay facing the power module, and the control plug-in is located on the side of the heating relay facing away from the power module. The heating relay is electrically connected to the output terminal of the main positive relay through the internal circuit of the second main board. The control board is electrically connected to the control plug-in through a control harness. The control plug-in and the control harness are plugged in. Both the heating relay and the pre-charge relay are electrically connected to the control plug-in through the internal circuit of the second main board.

[0019] In one embodiment, the energy storage electrical box further includes a pre-charging resistor disposed on the first main board, and the pre-charging resistor and the high-voltage power extraction plug are spaced apart along the width direction of the box body. The pre-charging relay is electrically connected to the input terminal of the main positive relay and the pre-charging resistor.

[0020] And / or, the energy storage electrical box further includes an electrically connected heating fuse and an input connector. The heating fuse is located on the second main board and is electrically connected to the heating relay via the internal circuit of the second main board. The heating relay is electrically connected to the output terminal of the main positive relay via the internal circuit of the second main board. The input connector is electrically connected to the input terminal of the main power circuit and is preset in the mounting cavity and located on the side of the second main board facing away from the power module. The heating fuse is located on the side of the heating relay facing away from the pre-charge relay.

[0021] In one embodiment, the negative electrical component includes a shunt disposed on the first main board, the shunt and the power fuse being spaced apart along the width direction of the enclosure. The positive electrical component includes a main fuse and a current sensor disposed on the first main board, the main fuse and the current sensor being spaced apart along the length direction of the enclosure. The power fuse is disposed between the main fuse and the shunt. The energy storage electrical box further includes an input connector, an output connector, and a circuit breaker. The input connector, the circuit breaker, the shunt, the main negative relay, and the output connector are sequentially electrically connected. The input connector, the circuit breaker, the main fuse, the current sensor, the main positive relay, and the output connector are sequentially electrically connected. The input connector and the output connector are spaced apart along the width direction of the enclosure, and the circuit breaker and the input connector are spaced apart along the length direction of the enclosure. The power module and the main circuit board are disposed between the circuit breaker and the input connector.

[0022] In one embodiment, the main positive relay is electrically connected to the first motherboard and the second motherboard via a copper busbar, and the main negative relay is electrically connected to the first motherboard and the second motherboard via the copper busbar;

[0023] And / or, the output connector is a high-low voltage hybrid connector.

[0024] To achieve the above objectives, this utility model provides an energy storage system, which includes the energy storage electrical box described above.

[0025] The technical solution of this application, by setting a sampling plug-in on the main circuit board, allows the sampling harness to be directly plugged into the sampling plug-in, eliminating the physical fixing process of traditional terminal blocks. During installation, the connection is completed simply by aligning and inserting the sampling harness and the sampling plug-in, reducing wiring difficulty and assembly time, making it particularly suitable for the rapid deployment of large-scale energy storage systems. Furthermore, the sampling plug-in in this application is an electrical connector with a standardized interface design, which improves the pressure uniformity of the contact surface after the sampling harness and the sampling plug-in are plugged in, effectively reducing contact resistance fluctuations and signal transmission loss. In addition, the sampling plug-in is connected to the main power circuit through the internal circuitry of the main circuit board (copper-clad traces or printed conductors), resulting in a short path and controllable impedance, further improving the accuracy and anti-interference capability of the sampling signal. Simultaneously, by placing the sampling plug-in on the main circuit board, this application can utilize the multi-layer wiring characteristics of the printed circuit board to compactly arrange the sampling interface of the plug-in and the functional areas of the main power circuit, eliminating the need for additional terminal blocks and reducing the use of wiring harnesses. This significantly saves installation space and is conducive to the development of energy storage systems towards high density and modularity. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural diagram of an embodiment of the energy storage electrical box of this utility model;

[0028] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the energy storage electrical box of this utility model.

[0029] Explanation of icon numbers:

[0030] 100. Enclosure; 200. Main circuit board; 210. First main board; 220. Second main board; 230. Main positive relay; 240. Main negative relay; 310. Shunt; 321. Main fuse; 322. Current sensor; 400. Sampling module; 410. Front-end sampling module; 420. Back-end sampling module; 500. Control board; 600. Power module; 710. High-voltage power supply module; 720. Low-voltage power supply module; 730. Power fuse; 740. Control module; 750. Heating relay; 760. Pre-charge relay; 770. Pre-charge resistor; 780. Heating fuse; 790. Circuit breaker; 810. Input connector; 820. Output connector.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of the present utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] Furthermore, in the embodiments of this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of the embodiments of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0036] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by the embodiments of this utility model.

[0037] With the rapid development of new energy power generation, smart grids, and electric vehicles, energy storage systems, as the core unit of energy conversion and management, have attracted much attention regarding their safety and reliability. In energy storage systems, high-voltage sampling is a key link in realizing battery status monitoring, energy balancing, and system protection, and typically requires real-time acquisition of the voltage or current signal of the main circuit through a high-voltage sampling harness.

[0038] Currently, high-voltage sampling harnesses in energy storage systems are generally physically connected to the main circuit using terminals. Specifically, the high-voltage conductors in the main circuit are fixed to the metal terminals using screws or crimping, while the sampling harness is connected to the same terminal via secondary wiring.

[0039] However, the above methods require manual tightening or crimping of screws one by one during wiring, which is cumbersome and time-consuming, especially in large-scale energy storage systems. Secondly, poor contact after terminal connection can easily lead to distorted sampling signals or abnormal temperature rise, and even safety hazards. Furthermore, traditional terminal connections require a large amount of wiring space and use a lot of wire harnesses, resulting in insufficient compactness in the electrical cabinet layout, which is not conducive to the miniaturization design of equipment. In addition, during later maintenance, if it is necessary to replace the sampling wire harness or adjust the connection point, it is necessary to repeatedly disassemble and reassemble the terminals, further increasing maintenance costs and operational risks.

[0040] In view of this, this utility model provides an energy storage electrical box. By setting a sampling plug-in on the main circuit board, the sampling harness and the sampling plug-in are directly plugged in, eliminating the physical fixing process of traditional terminal blocks. During installation, the connection can be completed simply by aligning and inserting the sampling harness and the sampling plug-in, which can reduce wiring difficulty and effectively reduce assembly time, making it particularly suitable for the rapid deployment of large-scale energy storage systems. Moreover, the sampling plug-in in this application is an electrical plug-in with a standardized interface design, which can improve the pressure uniformity of the contact surface after the sampling harness and the sampling plug-in are plugged in, effectively reducing contact resistance fluctuations and signal transmission loss. In addition, the sampling plug-in is connected to the main power circuit through the internal circuit of the main circuit board (copper-clad traces or printed wires), with a short path and controllable impedance, further improving the accuracy and anti-interference capability of the sampling signal. At the same time, by setting the sampling plug-in on the main circuit board, this application can take advantage of the multi-layer wiring characteristics of the printed circuit board to compactly arrange the sampling interface of the plug-in and the functional area of ​​the main power circuit, eliminating the need for additional terminal blocks and reducing the use of wiring harnesses, thereby significantly saving installation space and facilitating the development of energy storage systems towards high density and modularity.

[0041] To better understand the above technical solution, the following detailed explanation is provided in conjunction with the accompanying drawings.

[0042] like Figure 1 and Figure 2 As shown in the figure, this utility model embodiment proposes an energy storage electrical box, which includes:

[0043] The housing 100 has an internal mounting cavity. Optionally, the housing 100 is a cuboid and can be made of metal; this is not limited. Of course, in other embodiments, the housing 100 can also be a cube or other irregular shape. In one embodiment, the housing 100 has a mounting cavity and a mounting opening communicating with the mounting cavity, the mounting cavity providing mounting space. Specifically, the mounting opening is located on the top surface of the housing 100, facilitating assembly by operators. A removable mounting cover can also be provided at the mounting opening, which can be fixed to the housing 100 by clips or bolts. In one embodiment, a sealing ring can also be provided around the periphery of the mounting opening to improve the sealing of the connection between the mounting cover and the housing 100, preventing dust, moisture, etc., from entering the mounting space through the mounting opening. To improve the reliability of the connection between the mounting cover and the housing 100, multiple bolts or clips can be spaced out along the circumference of the mounting opening. By providing locking force at multiple different locations, the firmness and reliability of fixing the mounting cover and the housing 100 can be effectively improved.

[0044] The main circuit board 200 is located within the housing 100. Specifically, the main circuit board 200 is a printed circuit board with internal copper-clad traces or printed conductors, enabling electrical connections between corresponding components. It is understood that these copper-clad traces or printed conductors form the various internal circuits of the main circuit board, facilitating electrical connections with other electrical components, reducing the use of wiring harnesses, and simplifying assembly while minimizing space requirements.

[0045] Electrical components are located in the mounting cavity and are electrically connected to the main circuit board 200 to form a main power circuit, which is the main output circuit of the entire system. These electrical components are the main power supply elements of the energy storage system and may include circuit breakers 790, shunts 310, pre-charge relays 760, fuses, current sensors 322, heating relays 750, etc. These components are electrically connected to the main circuit board 200 to form the main power circuit, thereby enabling the input and output of electrical energy.

[0046] A sampling plug-in 400 is disposed on the main circuit board 200 and electrically connected to the main power-on circuit. The sampling plug-in 400, located on the main circuit board 200, can be connected to the main power-on circuit through the internal circuitry of the main circuit board 200 to sample signals such as voltage or current of the main power-on circuit. This reduces the use of wiring harnesses, thereby reducing space requirements and making the internal layout of the energy storage electrical box more compact and lighter. In this application, the sampling plug-in 400 can be a commonly used electrical connector with a standardized interface design, facilitating connection with the sampling wiring harness. After connection, it can improve the pressure uniformity of the contact surface, effectively reduce contact resistance fluctuations, and reduce signal transmission loss; further details are omitted here.

[0047] A control board 500 is located in the mounting cavity. The control board 500 and the sampling plug-in 400 are connected via a sampling harness, which is plugged into the sampling plug-in 400. The control board 500 is mainly used to control the working status of corresponding components in the energy storage system. It is usually a BMS main control board, responsible for monitoring the system status, such as voltage, current, temperature, and other parameters, and performing equalization management based on the detected parameters. In other words, the BMS main control board is the "core hub" of the entire energy storage system. Through precise monitoring, intelligent protection, and efficient coordination, it ensures the safe, stable, and long-term operation of the energy storage system, while improving the system's energy efficiency. In this embodiment, the sampling harness electrically connects the sampling plug-in 400 and the control board 500, thereby transmitting the sampling signals, such as current or voltage, collected by the sampling plug-in 400 in the main energized circuit to the control board 500 to achieve corresponding functional control. Specifically, the sampling harness and the sampling plug-in 400 are plugged in, which allows for quick and convenient transmission of sampling signals, reducing the complexity of wiring the sampling harness and improving wiring efficiency. Moreover, subsequent maintenance is also simpler and more convenient.

[0048] In this embodiment, by setting a sampling plug-in 400 on the main circuit board 200, the sampling harness is directly plugged into the sampling plug-in 400, eliminating the physical fixing process of traditional wiring terminals. During installation, the connection can be completed simply by aligning and inserting the sampling harness into the sampling plug-in 400, which reduces wiring difficulty and effectively reduces assembly time, making it particularly suitable for the rapid deployment of large-scale energy storage systems. In other words, there is no need to use OT terminals for connection, which not only prevents errors but also saves time on bolt installation, thereby reducing material and labor costs and installation time, thus improving installation efficiency. Furthermore, the plug-in connection method improves the standardization of installation and reduces the adverse impact of operator errors on product standards. At the same time, the solution of this application reduces the number of wiring harness connections, resulting in higher integration and a cleaner, more aesthetically pleasing layout of the high-voltage box. Moreover, the sampling plug-in 400 in this application is a standardized interface electrical connector, which improves the pressure uniformity of the contact surface after the sampling harness and sampling plug-in 400 are plugged in, effectively reducing contact resistance fluctuations and signal transmission loss. Furthermore, the sampling plug-in 400 is connected to the main power-on circuit via the internal circuitry (copper traces or printed conductors) of the main circuit board 200. This short path and controllable impedance further improve the accuracy and anti-interference capability of the sampling signal. Simultaneously, by placing the sampling plug-in 400 on the main circuit board 200, the multi-layer wiring characteristics of the printed circuit board allow for a compact arrangement of the sampling interface of the plug-in and the functional areas of the main power-on circuit. This eliminates the need for additional terminal blocks and reduces the use of wiring harnesses, thereby significantly saving installation space and facilitating the development of energy storage systems towards high density and modularity.

[0049] In one embodiment of this utility model, reference is made to Figure 2 The energy storage electrical box also includes:

[0050] A power module 600 is disposed in the mounting cavity, and the control board 500 and the main circuit board 200 are disposed on adjacent sides of the power module 600.

[0051] A high-voltage power extraction plug-in 710 is disposed on the main circuit board 200 and is electrically connected to the main power supply circuit;

[0052] A low-voltage power supply plug-in 720 is disposed on the main circuit board 200, and the low-voltage power supply plug-in 720 and the high-voltage power supply plug-in 710 are spaced apart along the length of the housing 100. The sampling plug-in 400 is disposed on the side of the high-voltage power supply plug-in 710 facing away from the power module 600. In this way, the length space of the housing 100 can be fully utilized, and the various components can be arranged more rationally. The power module 600 is electrically connected to the high-voltage power supply plug-in 710 and the low-voltage power supply plug-in 720, and the control board 500 is electrically connected to the low-voltage power supply plug-in 720.

[0053] In the technical solution adopted in this embodiment, the power module 600 is a commonly used component in current energy storage systems, capable of supplying power to the main control board. In existing products, the power module 600 is typically connected to the main power circuit using wiring harnesses and terminals. The power module 600 converts the high voltage input from the main power circuit into low voltage before supplying it to the main control board. This process usually uses a large number of wiring harnesses, and the wiring is relatively cumbersome. Therefore, in this embodiment, a high-voltage power extraction plug-in 710 and a low-voltage power supply plug-in 720 are provided on the main circuit board 200. The high-voltage power extraction plug-in 710 is connected to the main power circuit through the internal circuit of the main circuit board 200. The input terminal of the power module 600 is connected to the high-voltage power extraction plug-in 710 through a high-voltage power extraction harness, and the high-voltage power extraction harness and the high-voltage power extraction plug-in 710 are plugged in. The output terminal of the power module 600 is electrically connected to the low-voltage power supply plug-in 720 through a low-voltage power supply harness, and the low-voltage power supply plug-in 720 is plugged in. The low-voltage power supply plug-in 720 is electrically connected to the control board 500 through a low-voltage power transmission harness, and the low-voltage power transmission harness and the low-voltage power supply plug-in 720 are plugged in. In this way, the power module 600 can extract high-voltage power from the main power circuit and supply low-voltage power to the control board 500. During the electrical connection process, the high-voltage power extraction plug-in 710 and the low-voltage power supply plug-in 720 act as corresponding components, which can reduce the use of wiring harnesses and reduce wiring difficulty. Optionally, the high-voltage power supply plug-in 710 is a 2P or 4P plug-in.

[0054] In one embodiment of this utility model, reference is made to Figure 2The energy storage electrical box also includes a power fuse 730, which can monitor and cut off abnormal currents (such as short circuits and overloads) in real time, effectively isolating faults and preventing high-voltage surges from damaging the power module 600, significantly improving system safety. The power fuse 730 is located on the main circuit board 200 between the high-voltage power extraction plug-in 710 and the sampling plug-in 400, and is electrically connected to the high-voltage power extraction plug-in 710 and the main power circuit. Specifically, by directly mounting the power fuse 730 on the main circuit board 200 and electrically connecting it to the main power circuit through the internal circuitry of the circuit board, an external fuse box and redundant cables are eliminated, simplifying the structure and achieving modular integration of protection functions, which is beneficial for mass production and rapid replacement. Furthermore, the size and layout of the power fuse 730 can be flexibly designed according to the stacked structure of the main circuit board 200, requiring no additional installation space, further reducing the equipment size and meeting the needs of high-density energy storage electrical boxes.

[0055] In one embodiment of this utility model, the low-voltage power supply plug-in 720 includes a first power supply plug-in and a second power supply plug-in spaced apart along the width direction of the housing 100. The first power supply plug-in is used to realize the overall low-voltage output of the power module 600, while the second power supply plug-in is used to power components that require low-voltage power, thus saving the use of wiring harnesses. The first and second power supply plug-ins are located on the main circuit board 200 and electrically connected through the internal circuit of the main circuit board 200. This reduces the use of wiring harnesses, reduces the space occupied by the housing 100, and further reduces the size of the device; moreover, it replaces traditional wiring terminals, reduces wiring difficulty, and effectively improves wiring efficiency. The first power supply plug-in is electrically connected to the power module 600, and the second power supply plug-in is electrically connected to the control board 500; wherein the number of output channels of the second power supply plug-in is greater than or equal to the number of output channels of the first power supply plug-in. It can be understood that the low-voltage power converted by the power module 600 first enters the second power supply plug-in via the first power supply plug-in. In one embodiment, the number of output channels of the second power supply plug-in is equal to the number of output channels of the first power supply plug-in, thus enabling power supply to any component. Of course, in other embodiments, the number of output channels of the second power supply plug-in is greater than that of the first power supply plug-in, enabling simultaneous power supply to multiple components. In other words, by using the first and second power supply plug-ins, the power module 600 can significantly reduce the use of wiring harnesses when supplying power to multiple components simultaneously, thereby saving wiring harness installation space and further reducing the overall size of the device, meeting the requirements for compact design. That is, this application, through the setting of the first and second power supply plug-ins, enables simultaneous power supply to the control board 500 and other components, resulting in a more compact layout. Optionally, the first power supply plug-in can be 4P, and the second power supply plug-in can be 8P or 12P; no limitation is made here.

[0056] In one embodiment of this utility model, reference is made to Figure 2 The main circuit board 200 includes a first main board 210, a second main board 220, and a main positive relay 230 and a main negative relay 240 electrically connected to the first main board 210 and the second main board 220. Specifically, the main circuit board 200 includes a first main board 210 and a second main board 220, which are connected to form a main power circuit via the main positive relay 230 and the main negative relay 240. The power module 600, the first main board 210, and the second main board 220 are arranged sequentially along the length of the enclosure 100, thus making full use of the internal space of the enclosure 100, which is particularly suitable for long and narrow enclosures 100. The main positive relay 230 and the main negative relay 240 are spaced apart along the width of the enclosure 100, thus reducing electromagnetic interference between the positive and negative circuits through physical isolation, while also balancing the heat distribution inside the enclosure 100. The electrical components include positive and negative electrical components. The positive electrical component, the main positive relay 230, the first main board 210, and the second main board 220 are electrically connected to form a positive circuit. The negative electrical component, the main negative relay 240, the first main board 210, and the second main board 220 are electrically connected to form a negative circuit. The positive and negative circuits together form the main power-on circuit. In other words, the positive electrical component, the main positive relay 230, the first main board 210, and the second main board 220 are connected in series to form the positive circuit, with the main positive relay 230 acting as the on / off control node to ensure precise management of the positive current. The negative electrical component, the main negative relay 240, the first main board 210, and the second main board 220 are connected in series to form the negative circuit, with the main negative relay 240 synchronously controlling the negative circuit's on / off state, achieving dual-relay collaborative protection. The positive and negative circuits together constitute the main power-on circuit, forming a complete energy transmission link. The sampling plug-in 400 is electrically connected to the positive and negative circuits, and can collect sampling signals such as voltage or current of the positive and negative circuits to ensure the smooth operation of the positive and negative circuits. It can be understood that the sampling plug-in 400 is directly electrically connected to the monitoring points of the positive and negative circuits through the internal circuitry of the circuit board, collecting positive and negative voltage or current signals in real time. The sampling plug-in 400 also allows for rapid connection with the sampling harness, achieving efficient signal transmission and timely control of corresponding functions.

[0057] In one embodiment of this utility model, reference is made to Figure 2The sampling plug-in 400 includes a front-end sampling plug-in 410 located on the first motherboard 210 and a rear-end sampling plug-in 420 located on the second motherboard 220. The front-end sampling plug-in 410 is electrically connected to the input terminals of the main positive relay 230 and the main negative relay 240, and is located on the side of the power fuse 730 facing away from the power module 600. The rear-end sampling plug-in 420 is electrically connected to the output terminals of the main positive relay 230 and the main negative relay 240. It can be understood that the front-end sampling plug-in 410, connected to the input terminals of the main positive relay 230 and the main negative relay 240, can collect the original voltage signal when the relays are not activated in real time, reflecting the front-end circuit status of the relays; the rear-end sampling plug-in 420, connected to the output terminals of the main positive relay 230 and the main negative relay 240, can monitor the actual operating voltage of the load circuit after the relays are closed, reflecting the rear-end circuit status of the relays. By sampling data from the front and back ends of the relay, the conduction status of the relay's front and back ends can be accurately determined (such as abnormal contact resistance, contact adhesion, or failure to close), realizing full-link voltage monitoring and reducing misjudgments caused by single-point sampling. Moreover, the front-end sampling plug-in 400 is located on the first main board 210 and the back-end sampling plug-in 420 is located on the second main board 220, which are connected to the relay through the internal circuits of the circuit boards, reducing coupling interference of positive and negative sampling signals during long-distance transmission.

[0058] In one embodiment of this utility model, reference is made to Figure 2The energy storage electrical box also includes a control plug-in 740, a heating relay 750, and a pre-charge relay 760, all located on the second main board 220. The heating relay 750 and the pre-charge relay 760 are spaced apart along the width of the box 100. The rear sampling plug-in 420 is located on the side of the heating relay 750 facing the power module 600. The control plug-in 740 is located on the side of the heating relay 750 facing away from the power module 600. The heating relay 750 is electrically connected to the output terminal of the main positive relay 230 through the internal circuit of the second main board 220. The control board 500 is electrically connected to the control plug-in 740 through a control harness. The control plug-in 740 and the control harness are plugged in. Both the heating relay 750 and the pre-charge relay 760 are electrically connected to the control plug-in 740 through the internal circuit of the second main board 220. Understandably, by using the control plug-in 740 mounted on the second motherboard 220, and the heating relay 750 and pre-charge relay 760 connected to the control plug-in 740 via the internal circuitry of the second motherboard 220, simultaneous control of two relays by one control plug-in 740 is achieved. This reduces the number of wiring harnesses used between the control plug-in 740 and the two relays, making the internal layout of the housing 100 simpler and clearer, and facilitating assembly. In this embodiment, the control plug-in 740 is connected to the control board 500 via a control wiring harness, thereby forming a low-voltage control loop.

[0059] In one embodiment of this utility model, reference is made to Figure 2 The energy storage electrical box also includes a pre-charge resistor 770, which is disposed on the first main board 210. The pre-charge resistor 770 and the high-voltage power extraction plug 710 are spaced apart along the width direction of the box body 100. The pre-charge relay 760 is electrically connected to the input terminal of the main positive relay 230 and the pre-charge resistor 770. This allows the pre-charge resistor 770 and the pre-charge relay 760 to be connected in series. Through the current limiting of the pre-charge resistor 770 and the switching of the pre-charge relay 760, the current in the positive circuit is effectively prevented from being too large, thus jointly protecting the startup safety of the entire main power circuit.

[0060] And / or, the energy storage electrical box further includes an electrically connected heating fuse 780 and an input connector 810. The heating fuse 780 is located on the second main board 220 and is electrically connected to the heating relay 750 via the internal circuitry of the second main board 220. The heating relay 750 is electrically connected to the output terminal of the main positive relay 230 via the internal circuitry of the second main board 220, thus reducing the use of wiring harnesses. The input connector 810 is electrically connected to the input terminal of the main power circuit and is pre-installed in the mounting cavity on the side of the second main board 220 facing away from the power module 600. The heating fuse 780 is located on the side of the heating relay 750 facing away from the pre-charge relay 760. Thus, when the heating circuit experiences abnormal current due to overload, short circuit, or component failure, the heating fuse 780 can quickly melt, cutting off the heating circuit and preventing the abnormal current from back-impacting the main positive relay 230, protecting the core components of the main power circuit from damage. Optionally, the input connector 810 is pre-installed in the mounting cavity, forming a modular structure with the enclosure 100. During assembly, the main circuit board 200 and its components can be assembled outside the enclosure 100 to form a main circuit module. The main circuit module is then assembled into the mounting cavity, and the corresponding components are connected to the input connector 810, making the entire assembly process simpler and more convenient. Furthermore, the heating fuse 780 and heating relay are connected via the internal circuitry of the second main board 220, eliminating the need for additional wiring harnesses and mounting brackets. This maximizes the use of the internal space of the enclosure 100, supporting the miniaturization and high-density layout of the energy storage electrical box. Simultaneously, the heating relay 750 is directly connected to the output of the main positive relay 230 via the internal circuitry of the second main board 220, eliminating the line loss and parasitic inductance of traditional external wires and improving circuit efficiency and stability. The input connector 810 is positioned away from the power module 600, effectively blocking the switching noise of the power module 600 and improving system electromagnetic compatibility.

[0061] In one embodiment of this utility model, reference is made to Figure 2The negative electrical component includes a shunt 310 disposed on the first main board 210. The shunt 310 and the power fuse 730 are spaced apart along the width direction of the enclosure 100. The positive electrical component includes a main fuse 321 and a current sensor 322 disposed on the first main board 210. The main fuse 321 and the current sensor 322 are spaced apart along the length direction of the enclosure 100. The power fuse 730 is disposed between the main fuse 321 and the shunt 310. The energy storage electrical box also includes an input connector 810, an output connector 820, and a circuit breaker 790. The input connector 810 and the circuit breaker... The shunt 310, the main negative relay 240, and the output connector 820 are sequentially electrically connected. Similarly, the input connector 810, the circuit breaker 790, the main fuse 321, the current sensor 322, the main positive relay 230, and the output connector 820 are sequentially electrically connected. The input connector 810 and the output connector 820 are spaced apart along the width of the enclosure 100, and the circuit breaker 790 and the input connector 810 are spaced apart along the length of the enclosure 100. The power module 600 and the main circuit board 200 are located between the circuit breaker 790 and the input connector 810. This rational distribution of positive and negative electrical components results in a compact and efficient overall layout, maximizing the use of the limited space in the enclosure 100, reducing the size of the electrical box, and adapting to more application scenarios. Furthermore, the rational arrangement of components also helps reduce electromagnetic interference, ensuring the accuracy and stability of signal transmission. In addition, while meeting functional requirements, the electrical clearances and creepage distances of various electrical components are ensured, improving the safety of system operation. Simultaneously, the included current sensor 322 can monitor the current status in real time, providing data support for the operation of the main fuse 321, thereby further improving the overall circuit's operational safety. Optionally, the circuit breaker 790 is a 4-pole component, with 2 poles each for the positive and negative terminals.

[0062] In one embodiment of this utility model, the main positive relay 230 is electrically connected to the first main board 210 and the second main board 220 via a copper busbar, and the main negative relay 240 is also electrically connected to the first main board 210 and the second main board 220 via the copper busbar. This compact design of the copper busbar further reduces the size of the device, meeting the design requirements for miniaturization. Furthermore, the copper busbar has a high current-carrying capacity, meeting the usage requirements of high-power energy storage systems.

[0063] And / or, the output connector 820 is a high-low voltage hybrid connector, thus allowing the output connector 820 to be used when connecting an energy storage converter or an energy storage system in parallel. This achieves two uses for a single component, effectively reducing the number of components and wiring harnesses used, resulting in a simpler overall structure and lower cost. Furthermore, it can further reduce the space occupied by the enclosure 100, making the equipment more compact.

[0064] To achieve the above objectives, this utility model provides an energy storage system, which includes the energy storage electrical box described above. Specifically, the specific structure of the energy storage electrical box refers to the above embodiments. Since this energy storage system adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here. In this embodiment, multiple energy storage electrical boxes are provided, and these boxes can be stacked. Each energy storage electrical box can be an elongated box, and adjacent energy storage electrical boxes can be electrically connected through an input connector 810.

[0065] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model embodiments. Any equivalent structural transformations made under the technical concept of the present utility model using the description and drawings of the present utility model embodiments, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model embodiments.

Claims

1. An energy storage electrical box, characterized in that, The energy storage electrical box includes: The enclosure has a mounting cavity; The main circuit board is located in the enclosure; Electrical components are located in the mounting cavity and are electrically connected to the main circuit board to form a main power circuit; A sampling plug-in is located on the main circuit board and electrically connected to the main power circuit; and A control board is located in the mounting cavity. The control board and the sampling plug are connected by a sampling harness, and the sampling harness and the sampling plug are plugged in.

2. The energy storage electrical box as described in claim 1, characterized in that, The energy storage electrical box also includes: A power module is disposed in the mounting cavity, and the control board and the main circuit board are disposed on adjacent sides of the power module; A high-voltage power extraction plug is located on the main circuit board and is electrically connected to the main power circuit; A low-voltage power supply plug is located on the main circuit board, and the low-voltage power supply plug and the high-voltage power take-off plug are spaced apart along the length of the housing. The sampling plug is located on the side of the high-voltage power take-off plug facing away from the power module. The power module is electrically connected to the high-voltage power take-off plug and the low-voltage power supply plug. The control board is electrically connected to the low-voltage power supply plug.

3. The energy storage electrical box as described in claim 2, characterized in that, The energy storage electrical box also includes a power fuse, which is located on the main circuit board and between the high-voltage power extraction plug and the sampling plug. The power fuse is electrically connected to the high-voltage power extraction plug and the main power circuit.

4. The energy storage electrical box as described in claim 2 or 3, characterized in that, The low-voltage power supply module includes a first power supply module and a second power supply module spaced apart along the width direction of the enclosure. The first power supply module and the second power supply module are located on the main circuit board and electrically connected through the internal circuit of the main circuit board. The first power supply module is electrically connected to the power module, and the second power supply module is electrically connected to the control board. The number of output channels of the second power supply module is greater than or equal to the number of output channels of the first power supply module.

5. The energy storage electrical box as described in claim 3, characterized in that, The main circuit board includes a first main board, a second main board, and a main positive relay and a main negative relay electrically connected to the first main board and the second main board. The power module, the first main board, and the second main board are arranged sequentially along the length of the enclosure. The main positive relay and the main negative relay are spaced apart along the width of the enclosure. The electrical components include positive electrical components and negative electrical components. The positive electrical components, the main positive relay, the first main board, and the second main board are electrically connected to form a positive circuit. The negative electrical components, the main negative relay, the first main board, and the second main board are electrically connected to form a negative circuit. The positive circuit and the negative circuit form the main power-on circuit. The sampling plug-in is electrically connected to the positive circuit and the negative circuit.

6. The energy storage electrical box as described in claim 5, characterized in that, The sampling plug-in includes a front-end sampling plug-in located on the first motherboard and a rear-end sampling plug-in located on the second motherboard. The front-end sampling plug-in is electrically connected to the input terminal of the main positive relay and the input terminal of the main negative relay, and is located on the side of the power fuse facing away from the power module. The rear-end sampling plug-in is electrically connected to the output terminal of the main positive relay and the output terminal of the main negative relay.

7. The energy storage electrical box as described in claim 6, characterized in that, The energy storage electrical box also includes a control module, a heating relay, and a pre-charge relay, all located on the second main board. The heating relay and the pre-charge relay are spaced apart along the width of the box. The rear sampling module is located on the side of the heating relay facing the power module, and the control module is located on the side of the heating relay facing away from the power module. The heating relay is electrically connected to the output terminal of the main positive relay through the internal circuit of the second main board. The control board is electrically connected to the control module through a control harness. The control module and the control harness are plugged in. Both the heating relay and the pre-charge relay are electrically connected to the control module through the internal circuit of the second main board.

8. The energy storage electrical box as described in claim 7, characterized in that, The energy storage electrical box also includes a pre-charging resistor, which is disposed on the first main board, and the pre-charging resistor and the high-voltage power take-off plug are spaced apart along the width direction of the box body. The pre-charging relay is electrically connected to the input terminal of the main positive relay and the pre-charging resistor. And / or, the energy storage electrical box further includes an electrically connected heating fuse and an input connector. The heating fuse is located on the second main board and is electrically connected to the heating relay via the internal circuit of the second main board. The heating relay is electrically connected to the output terminal of the main positive relay via the internal circuit of the second main board. The input connector is electrically connected to the input terminal of the main power circuit and is preset in the mounting cavity and located on the side of the second main board facing away from the power module. The heating fuse is located on the side of the heating relay facing away from the pre-charge relay.

9. The energy storage electrical box as described in any one of claims 5-8, characterized in that, The negative electrical component includes a shunt located on the first main board. The shunt and the power fuse are spaced apart along the width of the enclosure. The positive electrical component includes a main fuse and a current sensor located on the first main board and spaced apart along the length of the enclosure. The power fuse is located between the main fuse and the shunt. The energy storage electrical box also includes an input connector, an output connector, and a circuit breaker. The input connector, the circuit breaker, the shunt, the main negative relay, and the output connector are sequentially electrically connected. The input connector, the circuit breaker, the main fuse, the current sensor, the main positive relay, and the output connector are sequentially electrically connected. The input connector and the output connector are spaced apart along the width of the enclosure. The circuit breaker and the input connector are spaced apart along the length of the enclosure. The power module and the main circuit board are located between the circuit breaker and the input connector.

10. The energy storage electrical box as described in claim 9, characterized in that, The main positive relay is electrically connected to the first motherboard and the second motherboard via a copper busbar, and the main negative relay is electrically connected to the first motherboard and the second motherboard via the copper busbar. And / or, the output connector is a high-low voltage hybrid connector.

11. An energy storage system, characterized in that, The energy storage system includes an energy storage electrical box as described in any one of claims 1 to 10.

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