Low-voltage energy storage cabinet

Abstract

The utility model relates to electrical equipment manufacturing technical field especially a kind of low pressure energy storage cabinet, including cabinet assembly, battery module, battery management system and electrical control unit.Cabinet assembly is common load-bearing base, it includes cabinet, upper cabinet door and lower cabinet door.DC distribution module and AC distribution module belonging to electrical control unit are arranged in area, and respectively with cabinet door, lower cabinet door as installation base.DC distribution module is as electrical energy transfer hub, it is electrically connected with battery module, is coordinated with AC distribution module to complete AC-DC bidirectional conversion, and is connected with battery management system signal.Such, on the one hand, realize the physical isolation of DC distribution module and AC distribution module, avoid the occurrence of line cross phenomenon, not only improve cabinet space utilization, but also cut off electromagnetic interference path;On the other hand, it is beneficial to pre-assembly and pre-test of DC distribution module and AC distribution module, not only reduce wiring error risk, and simplify maintenance process.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment manufacturing technology, and in particular to a low-voltage energy storage cabinet. Background Technology

[0002] With the development of new energy technologies, low-voltage energy storage cabinets, as core equipment for distributed energy storage and dispatch, are widely used in residential, industrial, commercial, and microgrid systems. Low-voltage energy storage cabinets typically integrate battery modules, battery management systems, and electrical control units. Their internal structural layout and assembly efficiency directly affect the equipment's safety, ease of operation and maintenance, and adaptability to industrial production.

[0003] Currently, in the industry, the electrical control units (especially DC and AC power distribution modules) of low-voltage energy storage cabinets are mostly centrally located within the cabinet. This traditional layout is gradually revealing the following prominent problems in practical applications: 1) Low space utilization and complex wiring: Specifically, the DC power distribution module (connected to the battery side, responsible for the distribution and protection of DC power) and the AC power distribution module (connected to the power grid / load side, responsible for the conversion and protection of AC power) are functionally independent but physically close, causing the AC and DC lines to cross and entangle in the cabinet. This not only occupies extra space but may also affect the stability of the equipment due to electromagnetic interference, while increasing the difficulty of troubleshooting line faults. 2) Low assembly and maintenance efficiency. Specifically, in traditional layouts, DC and AC power distribution modules need to be installed and wired one by one after the cabinet is assembled. The on-site process is cumbersome and relies on manual alignment and verification, which is prone to wiring errors due to operational mistakes. Furthermore, when it is necessary to repair or replace module components, it is necessary to go deep into the cabinet for operation. Due to space limitations, the disassembly and assembly process is time-consuming and labor-intensive, affecting the rapid maintenance response of the equipment.

[0004] In summary, technical personnel are urgently needed to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a low-voltage energy storage cabinet, which aims to solve the problems in the existing technology, such as low space utilization caused by the centralized arrangement of DC power distribution modules and AC power distribution modules, electromagnetic interference caused by the intersection of AC and DC lines, easy errors in the assembly process, and inconvenience of maintenance requiring deep operation inside the cabinet.

[0006] This utility model relates to a low-voltage energy storage cabinet, including a cabinet assembly, battery modules, a battery management system, and an electrical control unit. The cabinet assembly serves as a common support base for the battery modules, battery management system, and electrical control unit, and includes a cabinet body, an upper cabinet door, and a lower cabinet door. The upper and lower cabinet doors are rotatably connected to the cabinet body. The electrical control unit includes a DC power distribution module and an AC power distribution module. The DC and AC power distribution modules are arranged in separate areas, with the upper and lower cabinet doors serving as mounting bases, respectively. The DC power distribution module acts as a power transfer hub, electrically connected to the battery modules, working in conjunction with the AC power distribution module to complete bidirectional AC / DC power conversion, and signal connected to the battery management system.

[0007] As a further improvement to the technical solution disclosed in this utility model, the DC power distribution module integrates a DC circuit breaker and a voltage sensor; the AC power distribution module integrates an AC contactor and a leakage current protector; the battery management system is connected to the DC power distribution module via a CAN bus to receive battery voltage data collected by the voltage sensor and control the on / off state of the DC circuit breaker and the AC contactor.

[0008] As a further improvement to the technical solution disclosed in this utility model, the cabinet assembly also includes a load-bearing plate; the load-bearing plate extends across the inner cavity of the cabinet, serving as the mounting and fixing carrier for the battery module, and is detachably and fixedly connected to the left and right side panels of the cabinet.

[0009] As a further improvement to the technical solution disclosed in this utility model, the upper cabinet door, lower cabinet door, load-bearing plate, and the top, left, and right sides of the cabinet are all provided with a series of heat dissipation holes, which work together to form a through-type heat dissipation channel; the airflow enters from the heat dissipation holes at the bottom and sides of the cabinet, flows through the heat dissipation holes of the load-bearing plate through each electrical space, and finally exits from the heat dissipation holes at the top of the cabinet.

[0010] As a further improvement to the technical solution disclosed in this utility model, the inner side of the heat dissipation holes of the upper cabinet door and the lower cabinet door is provided with dustproof and heat dissipation cotton, and its thickness is 5-8mm.

[0011] As a further improvement to the technical solution disclosed in this utility model, the surface of the load-bearing plate is provided with multiple parallel mounting guide rails; the battery module is slidably connected to the load-bearing plate through the mounting guide rails, and the mounting position of the battery module is locked by a quick-locking component.

[0012] As a further improvement to the technical solution disclosed in this utility model, the DC power distribution module and the upper cabinet door are pre-installed as an integrated module, the AC power distribution module and the lower cabinet door are pre-installed as an integrated module, and the battery module and the battery management system are pre-installed as an integrated module with the cabinet. The three are assembled as a whole through standardized electrical connection interfaces and mechanical fixing interfaces.

[0013] As a further improvement to the technical solution disclosed in this utility model, the integrated module of DC power distribution module and upper cabinet door and the integrated module of AC power distribution module and lower cabinet door both adopt a preset bracket for component arrangement, and the installation areas of each component are independent of each other.

[0014] As a further improvement to the technical solution disclosed in this utility model, a positioning pin is fixed on the side wall of the upper cabinet door; a positioning hole adapted to the positioning pin is provided on the DC power distribution module; and the fitting accuracy between the positioning pin and the positioning hole is not less than 0.5mm.

[0015] As a further improvement to the technical solution disclosed in this utility model, the standardized electrical connection interface adopts a foolproof design, with unique matching shape and polarity markings on both the male and female ends of the interface; the mechanical fixing interface adopts a quick-release bolt structure.

[0016] In practical applications, the low-voltage energy storage cabinet disclosed in this utility model can achieve at least the following beneficial technical effects, specifically: 1) The DC and AC power distribution modules are arranged in separate zones, with the upper and lower cabinet doors serving as the mounting bases, respectively, achieving physical isolation between the functional modules. This effectively avoids the cross-entanglement of AC and DC lines within the cabinet, significantly improving space utilization and reducing the difficulty of troubleshooting line faults. Furthermore, it eliminates electromagnetic interference paths caused by the close parallel operation of AC and DC circuits, thereby ensuring the accuracy of voltage and current sampling and the signal judgment of the battery management system. 2) By combining the DC and AC power distribution modules with the upper and lower cabinet doors respectively to form independent installation units, it is easier to pre-assemble and pre-test the DC and AC power distribution modules. This reduces manual alignment and verification steps, lowering the risk of wiring errors. Furthermore, maintenance only requires opening the corresponding upper or lower cabinet door, eliminating the need to enter the cabinet, overcoming space limitations, significantly shortening disassembly and maintenance time, and thus improving equipment operation and maintenance response speed. Attached Figure Description

[0017] 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 these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional schematic diagram of the low-voltage energy storage cabinet disclosed in this utility model.

[0019] Figure 2This is also a three-dimensional schematic diagram of the low-voltage energy storage cabinet disclosed in this utility model (with both the upper and lower cabinet doors hidden).

[0020] Figure 3 This is a three-dimensional schematic diagram of the cabinet assembly in the low-voltage energy storage cabinet disclosed in this utility model.

[0021] Figure 4 This is a three-dimensional schematic diagram of the cabinet assembly in the low-voltage energy storage cabinet disclosed in this utility model from another perspective.

[0022] Figure 5 This is also a three-dimensional schematic diagram of the cabinet assembly in the low-voltage energy storage cabinet disclosed in this utility model (with the upper and lower cabinet doors open).

[0023] Figure 6 This is a schematic diagram showing the state of the DC power distribution module in the low-voltage energy storage cabinet disclosed in this utility model after it has been pre-installed relative to the upper cabinet door.

[0024] Figure 7 This is a schematic diagram showing the state of the AC power distribution module in the low-voltage energy storage cabinet disclosed in this utility model after it has been pre-installed relative to the lower cabinet door.

[0025] 1-Cabinet assembly; 11-Cabinet; 111-Top heat dissipation; 112-Left side heat dissipation hole; 113-Right side heat dissipation hole; 12-Upper cabinet door; 121-Upper heat dissipation hole; 13-Lower cabinet door; 131-Lower heat dissipation hole; 14-Upper hinge; 15-Lower hinge; 16-Support plate; 161-Inner cavity heat dissipation hole; 2-Battery module; 3-Battery management system; 4-Electrical control unit; 41-DC power distribution module; 42-AC power distribution module. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments. Figure 1 , Figure 2 The diagram shows the structure of the low-voltage energy storage cabinet disclosed in this utility model. It is evident that it mainly consists of a cabinet assembly 1, battery modules 2, a battery management system 3, and an electrical control unit 4. The cabinet assembly 1 serves as the shared foundation for the battery modules 2, battery management system 3, and electrical control unit 4, providing installation support and protective space. The battery modules 2 are the core carriers of electrical energy storage, responsible for the efficient storage and release of electrical energy. The battery management system 3 acts as the intelligent monitoring and control center, monitoring battery status in real time and ensuring operational safety. The electrical control unit 4 undertakes the functions of energy conversion and distribution. These three components work together to construct a complete low-voltage energy storage operation system. like Figures 3-5As shown, the cabinet assembly 1 includes a cabinet body 11, an upper cabinet door 12, a lower cabinet door 13, an upper hinge 14, and a lower hinge 15. The upper cabinet door 12 is rotatably connected to the cabinet body 11 via the upper hinge 14, and the lower cabinet door 13 is rotatably connected to the cabinet body 11 via the lower hinge 15, so as to flexibly realize the opening and closing of the upper cabinet door 12 and the lower cabinet door 13, thereby providing convenience for the installation and maintenance of the components inside the cabinet.

[0027] like Figure 2 As shown, the electrical control unit 4 includes a DC power distribution module 41 and an AC power distribution module 42. The DC power distribution module 41 serves as an energy transfer hub, electrically connected to the battery module 2. It is responsible for receiving DC power output from the battery module 2 or supplying charging DC power to the battery module 2. It works in conjunction with the AC power distribution module 42 to complete bidirectional AC-DC power conversion. At the same time, it is connected to the battery management system 3 to transmit electrical parameter information and respond to control commands. The AC power distribution module 42 is responsible for supplying the AC power converted by the DC power distribution module to external loads, or receiving external AC power and transmitting it to the DC power distribution module for rectification and charging. like Figure 6 , Figure 7 As shown, the DC power distribution module 41 and the AC power distribution module 42 are arranged in separate areas, with the upper cabinet door 12 and the lower cabinet door 13 serving as the mounting bases, respectively. This achieves physical isolation between the DC power distribution module 41 and the AC power distribution module 42, effectively preventing AC and DC lines from crossing and tangling within the cabinet, significantly improving cabinet space utilization, reducing the difficulty of troubleshooting line faults, and cutting off electromagnetic interference paths caused by close parallel AC and DC circuits. This ensures the accuracy of voltage and current sampling and the signal judgment of the battery management system 3, providing reliable protection for the precise control of the battery module 2. The DC power distribution module 41 also integrates a DC circuit breaker and a voltage sensor; the DC circuit breaker controls the on / off state of the DC circuit, providing overload and short-circuit protection, while the voltage sensor collects voltage data from the battery module 2 in real time, providing basic parameters for battery status monitoring.

[0028] It should also be noted that the AC power distribution module 42 integrates both an AC contactor and a residual current device (RCD). The AC contactor controls the on / off state of the AC circuit, while the RCD quickly cuts off the power supply in case of a leakage fault, thus improving the electrical safety of the equipment. The battery management system 3 is connected to the DC power distribution module 41 via a CAN bus to receive battery voltage data collected by the voltage sensor. This allows for accurate assessment of the charging status, charge level, and health condition of the battery module 2. Based on the monitoring results, the system controls the on / off state of the DC circuit breaker and the AC contactor to ensure that the battery module always operates under safe conditions. like Figure 5As shown, the cabinet assembly 1 also includes a support plate 16. The support plate 16 extends horizontally within the cavity of the cabinet 11, serving as the mounting and fixing carrier for the battery module 2, providing stable support for the battery module. The support plate 16 is detachably fixed to the left and right side panels of the cabinet 11, facilitating disassembly, assembly, and position adjustment to accommodate the installation requirements of battery modules of different specifications. The surface of the support plate 16 has multiple parallel mounting guide rails (not shown in the figure); the battery module 2 is slidably connected to the support plate 16 via the mounting guide rails, facilitating quick insertion and removal of the battery module. Furthermore, a quick-locking assembly locks the installation position of the battery module 2, ensuring that the battery module will not shift due to vibration or other factors during equipment operation, thus improving installation stability. like Figures 3-5 As shown, the upper cabinet door 12 is provided with an upper heat dissipation hole 121, the lower cabinet door 13 is provided with a lower heat dissipation hole 131, the support plate 16 is provided with an internal heat dissipation hole 161, the top plate of the cabinet 11 is provided with a top heat dissipation hole 111, the left side plate is provided with a left side heat dissipation hole 112, and the right side plate is provided with a right side heat dissipation hole 113, and they work together to form a through-type heat dissipation channel. Specifically, the airflow enters from the heat dissipation holes at the bottom and sides of the cabinet 11, flows through the internal heat dissipation holes 161 of the support plate 16 and through each electrical space, and finally exits from the top heat dissipation hole 111 at the top of the cabinet 11. This can quickly remove the heat generated by the operation of the battery module 2 and the electrical control unit 4 inside the cabinet, effectively control the temperature inside the cabinet, and, together with the precise monitoring of the battery management system 3, significantly improve the operational stability and service life of the battery module 2 and the electrical control unit 4, and reduce the equipment failure rate.

[0029] As a further optimization of the above technical solution, dustproof and heat-dissipating cotton (preferably 5-8mm thick) is attached to the inner walls of both the upper cabinet door 12 and the lower cabinet door 13, completely covering the upper heat dissipation hole 121 and the lower heat dissipation hole 13 (not shown in the figure). The dustproof and heat-dissipating cotton can effectively prevent external dust from entering the cabinet without obstructing airflow, reducing dust accumulation on the surface of electrical components, lowering the risk of short circuits and insulation aging caused by dust, and ensuring the heat dissipation efficiency of the heat dissipation channel.

[0030] like Figure 2 , Figure 6 , Figure 7As shown, the DC power distribution module 41 is pre-installed as an integrated module with the upper cabinet door 12, the AC power distribution module 42 is pre-installed as an integrated module with the lower cabinet door 13, and the battery module 2 and battery management system 3 are both pre-installed as integrated modules with the cabinet body 11. All three are assembled as a whole through standardized electrical connection interfaces and mechanical fixing interfaces. This significantly simplifies the on-site assembly process, improves assembly efficiency, and reduces the professional skill requirements for on-site assembly personnel, greatly facilitating future equipment upgrades and component replacements, and enhancing the equipment's versatility and maintainability. Furthermore, it facilitates the pre-assembly and pre-testing of the DC power distribution module 41 and the AC power distribution module 42, reducing on-site manual alignment and verification steps, lowering the risk of wiring errors, and allowing for operation by simply opening the corresponding upper cabinet door 12 or lower cabinet door 13 during maintenance, eliminating the need to penetrate the cabinet. This overcomes space limitations, significantly shortens disassembly and maintenance time, and improves equipment operation and maintenance response speed.

[0031] Similarly, Figure 6 , Figure 7 As shown, the integrated module of DC power distribution module 41 and upper cabinet door 12 and the integrated module of AC power distribution module 42 and lower cabinet door 13 are arranged with preset brackets, and the installation areas of each component are independent of each other. In this way, mutual interference between different components is effectively avoided, and the component layout is more regular, which facilitates wiring and maintenance operations.

[0032] To ensure good positioning accuracy of the DC power distribution module 41 after installation, as a further optimization of the above technical solution, a positioning pin is fixed to the side wall of the upper cabinet door 12, and the DC power distribution module 41 is provided with a positioning hole that matches the positioning pin. The fitting accuracy between the positioning pin and the positioning hole is no less than 0.5mm. This effectively ensures the precise installation position of the DC power distribution module 41 on the upper cabinet door 12, guarantees accurate alignment when connecting it to other modules, and reduces assembly errors.

[0033] The AC power distribution module 42 adopts a similar method to achieve high-precision pre-assembly of the AC power distribution module 42 and the lower cabinet door 13. This ensures that the AC power distribution module 42 can quickly find the installation position during the pre-assembly process, which not only improves the assembly efficiency of the integrated module, but also ensures the positional consistency of the AC power distribution module 42 when it is connected to the DC power distribution module 41 and the battery management system 3. This further reduces the assembly error between modules and provides reliable structural support for the accurate connection of standardized interfaces.

[0034] Finally, it should be noted that the standardized electrical connection interface adopts a foolproof design, meaning that both the male and female terminals of the interface have unique matching shape and polarity markings to effectively avoid problems such as reverse insertion or incorrect insertion during wiring, reducing the risk of wiring errors. The mechanical fixing interface uses a quick-release bolt structure, allowing for the fixing and disassembly of modules without the need for complex tools, improving the convenience of assembly and maintenance.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-voltage energy storage cabinet, comprising a cabinet assembly, a battery module, a battery management system, and an electrical control unit; the cabinet assembly serves as a common load-bearing foundation for the battery module, the battery management system, and the electrical control unit, and includes a cabinet body, an upper cabinet door, and a lower cabinet door; the upper cabinet door and the lower cabinet door are rotatably connected to the cabinet body, characterized in that, The electrical control unit includes a DC power distribution module and an AC power distribution module; the DC power distribution module and the AC power distribution module are arranged in separate areas and are respectively mounted on the upper cabinet door and the lower cabinet door; wherein, the DC power distribution module serves as a power transfer hub, is electrically connected to the battery module, works with the AC power distribution module to complete bidirectional AC-DC power conversion, and is signal connected to the battery management system.

2. The low-voltage energy storage cabinet according to claim 1, characterized in that, The DC power distribution module integrates a DC circuit breaker and a voltage sensor; the AC power distribution module integrates an AC contactor and a leakage current protector; the battery management system is connected to the DC power distribution module via a CAN bus to receive battery voltage data collected by the voltage sensor and control the on / off states of the DC circuit breaker and the AC contactor.

3. The low-voltage energy storage cabinet according to any one of claims 1-2, characterized in that, The cabinet assembly also includes a load-bearing plate; the load-bearing plate extends across the inner cavity of the cabinet, serving as the mounting and fixing carrier for the battery module, and is detachably and fixedly connected to the left and right side panels of the cabinet.

4. The low-voltage energy storage cabinet according to claim 3, characterized in that, The upper cabinet door, the lower cabinet door, the load-bearing plate, and the top, left, and right panels of the cabinet are all provided with a series of heat dissipation holes, which work together to form a through-type heat dissipation channel. Airflow enters from the heat dissipation holes at the bottom and sides of the cabinet, flows through the heat dissipation holes of the load-bearing plate through each electrical space, and finally exits from the heat dissipation holes at the top of the cabinet.

5. The low-voltage energy storage cabinet according to claim 4, characterized in that, The upper cabinet door and the lower cabinet door have dustproof and heat dissipation cotton inside the heat dissipation holes, and the thickness is 5-8mm.

6. The low-voltage energy storage cabinet according to claim 3, characterized in that, The surface of the load-bearing plate is provided with multiple parallel mounting rails; the battery module is slidably connected to the load-bearing plate through the mounting rails, and the mounting position of the battery module is locked by a quick-locking component.

7. The low-voltage energy storage cabinet according to any one of claims 1-2, characterized in that, The DC power distribution module and the upper cabinet door are pre-installed as an integrated module, the AC power distribution module and the lower cabinet door are pre-installed as an integrated module, and the battery module and the battery management system are both pre-installed as an integrated module with the cabinet body. All three are assembled together through standardized electrical connection interfaces and mechanical fixing interfaces.

8. The low-voltage energy storage cabinet according to claim 7, characterized in that, The integrated module of the DC power distribution module and the upper cabinet door, as well as the integrated module of the AC power distribution module and the lower cabinet door, all use a pre-set bracket for component arrangement, and the installation areas of each component are independent of each other.

9. The low-voltage energy storage cabinet according to claim 7, characterized in that, The side wall of the upper cabinet door is fixed with a positioning pin; the DC power distribution module is provided with a positioning hole that matches the positioning pin; and the fitting accuracy between the positioning pin and the positioning hole is not less than 0.5mm.

10. The low-voltage energy storage cabinet according to claim 7, characterized in that, The standardized electrical connection interface adopts a foolproof design, with unique matching shape and polarity markings on both the male and female ends; the mechanical fixing interface adopts a quick-release bolt structure.

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