Distribution box and energy storage system using same

Abstract

The invention relates to a distribution box and an energy storage system using the distribution box, which are characterized in that the distribution box comprises a box body, and a fire-fighting unit, a UPS unit, an AC circuit breaker assembly and a wiring terminal strip assembly which are arranged in the box body, the fire-fighting unit comprises a DC power supply module and a fire-fighting information relay module which are electrically connected, the UPS unit comprises a conversion power supply module and a direct-current battery which are electrically connected, the alternating-current circuit breaker assembly comprises an alternating-current circuit breaker, the alternating-current circuit breaker is electrically connected with the conversion power supply module through the wiring terminal strip assembly, and the direct-current battery is electrically connected with the direct-current power supply module; the power distribution box is installed in a cabinet body of the energy storage system, an alternating current circuit breaker of the power distribution box is electrically connected with a PCS module of the energy storage system and supplies power to the cooling system, and the fire fighting information relay module is connected with fire fighting equipment of the energy storage system. The system is compact in structure, modular in overall configuration and high in integration level.

Description

TECHNICAL FIELD

[0001] The application relates to a power distribution box and an energy storage system using the same, and belongs to the technical field of power distribution of energy storage battery cabinets. BACKGROUND

[0002] With the rapid development of renewable energy, the role of energy storage systems in energy storage and management is becoming increasingly important. Traditional power distribution boxes have many drawbacks when applied to energy storage systems. For example, the layout of electrical components is scattered, leading to complex wiring, which not only increases the installation difficulty, but also makes the later maintenance and troubleshooting difficult. Moreover, the traditional power distribution system devices are scattered, and the protection needs to consider individual component equipment, greatly increasing the maintenance cost, and the reduced reliability of the protection measures also affects the component life and system stability. Therefore, it is of great practical significance to develop a modular power distribution box suitable for energy storage systems. SUMMARY

[0003] The purpose of the application is to provide a power distribution box which is not only compact in structure, modular in overall configuration, but also high in integration, and an energy storage system using the same, which has the advantages of convenient installation and maintenance, reduced maintenance cost, device heat dissipation, and effective protection, to meet the growing needs of energy storage systems and improve the overall performance and stability of energy storage systems.

[0004] To achieve the above purpose, the first technical solution of the application is a power distribution box, which is characterized by comprising a box body, a fire-fighting unit, a UPS unit, an AC circuit breaker assembly and a terminal block assembly arranged in the box body,

[0005] The fire-fighting unit comprises a DC power supply module and a fire-fighting information relay module, the DC power supply module is electrically connected with the corresponding connection end of the fire-fighting information relay module, and the fire-fighting information relay module is used for external connection of an energy storage system,

[0006] The UPS unit comprises a conversion power supply module and a DC battery, the DC battery is connected to the DC input port of the conversion power supply module,

[0007] The AC circuit breaker assembly comprises an AC circuit breaker and a lightning surge protector, the lightning surge protector is connected in series at the input end of the AC circuit breaker,

[0008] The AC circuit breaker is connected to a 220V power supply and electrically connected to the conversion power supply module through the terminal block assembly, and the DC battery is electrically connected to the DC power supply module.

[0009] In the first technical solution mentioned above, the fire protection unit further includes a fire signal input / output module. The fire signal input / output module is electrically connected to the corresponding connection terminal of the fire information relay module. The fire signal input / output module is set in a sealed independent cavity, and the independent cavity is filled with moisture-proof insulating glue.

[0010] In the first technical solution mentioned above, a power connector is provided on the outer wall of the enclosure, and the wiring harness of the DC power module connection end passes through the isolation cable tray inside the enclosure and is electrically connected to the power connector.

[0011] In the first technical solution mentioned above, a signal connector is provided on the outer wall of the enclosure, and the fire signal input / output module is electrically connected to the signal connector.

[0012] In the first technical solution mentioned above, the fire signal input / output module also integrates a partial discharge online monitoring sensor, and the partial discharge online monitoring sensor is electrically connected to the fire information relay module for real-time acquisition of partial discharge signals inside the independent cavity.

[0013] In the first technical solution mentioned above, the DC power supply module and the fire information relay module are fixed to the rear side wall of the enclosure by fire unit fixing sheet metal parts, and a ceramic fiber board fireproof and heat insulation layer is pasted on the outside of the fire component fixing sheet metal parts, and the thickness of the ceramic fiber board fireproof and heat insulation layer is controlled within the range of 4mm to 6mm.

[0014] In the first technical solution mentioned above, the power conversion module is fixed to the bottom of the enclosure by a UPS unit support sheet metal part. A heat dissipation gap is reserved around the power conversion module, and a fireproof baffle is installed in the heat dissipation gap.

[0015] In the first technical solution mentioned above, the DC battery is fixed to the rear wall of the enclosure by a UPS unit fixing sheet metal part. A leak-proof protective box is fitted on the outside of the DC battery, and an electrolyte collection tank is opened at the bottom of the protective box. The electrolyte collection tank is equipped with a liquid level gauge for real-time monitoring of whether there is any leakage of electrolyte.

[0016] In the first technical solution mentioned above, the AC input port of the power conversion module is connected to the aviation plug on the panel of the enclosure, and a sealing gasket is installed at the connection between the aviation plug and the panel.

[0017] In the first technical solution mentioned above, the AC circuit breaker assembly is installed in an independent flame-retardant compartment inside the enclosure. The AC circuit breaker is fixed in the middle of the enclosure by the sheet metal supporting the circuit breaker assembly, and the AC circuit breaker is connected to the DC input terminal and the wall-penetrating adapter terminal on the enclosure panel via a cable or copper busbar.

[0018] In the first technical solution mentioned above, an interphase insulating partition is provided between the AC circuit breaker and the circuit breaker assembly support sheet metal parts.

[0019] In the first technical solution mentioned above, the AC circuit breaker assembly further includes a transition copper busbar, the AC circuit breaker is electrically connected to the transition copper busbar, and the transition copper busbar is used for electrical connection with an external cable. The connection node between the AC circuit breaker and the transition copper busbar is covered with an anti-corona shield.

[0020] In the first technical solution mentioned above, the housing is provided with an operating component for externally operating the AC circuit breaker. The operating component includes an operating handle and a handle extension rod. The operating handle is connected to the AC circuit breaker through the handle extension rod, and the outside of the operating handle is covered with an impact-resistant anti-collision protective sleeve.

[0021] In the first technical solution mentioned above, the terminal block assembly includes a waterproof cover, a miniature circuit breaker, and a terminal block. The miniature circuit breaker is connected to the terminal block, and the AC circuit breaker is electrically connected to the terminal block via a flame-retardant shielded cable. The operating switch of the miniature circuit breaker extends to the panel of the enclosure, and the operating switch is located inside the openable waterproof cover.

[0022] In the first technical solution mentioned above, the miniature circuit breaker is mounted on the terminal block assembly mounting sheet metal part via a guide rail, and the terminal block assembly mounting sheet metal part is fixed to the side wall of the enclosure.

[0023] In the first technical solution mentioned above, the waterproof cover is provided with a high and low temperature resistant silicone rubber sealing strip at the contact position with the panel of the box, and a small fire extinguishing bomb is added inside the waterproof cover.

[0024] In the first technical solution mentioned above, the enclosure is equipped with an explosion-proof valve, and the top opening of the independent flame-retardant compartment corresponds to the explosion-proof valve, so that when the AC circuit breaker arcs, the high-temperature gas can be directly discharged from the enclosure through the explosion-proof valve.

[0025] In the first technical solution described above, the enclosure is composed of a main shell, side wall panels, and a top cover. Double high and low temperature resistant silicone rubber sealing strips are installed at the connections between the top cover and the side wall panels and the main shell. The cross-section of the high and low temperature resistant silicone rubber sealing strips is trapezoidal. Additionally, the edge of the top cover extends into a waterproof eave with an inclination angle of 15° to 17°.

[0026] The enclosure panel is also equipped with an inspection handle and a waterproof cover. The end face of the terminal block assembly is located at the opening of the enclosure panel, and the waterproof cover is located at the opening and covers the outer periphery of the terminal block.

[0027] The inner side wall of the enclosure is equipped with a dedicated grounding copper busbar. The metal shells and sheet metal parts of the fire protection unit, UPS unit, AC circuit breaker assembly and terminal block assembly are all connected to the dedicated grounding copper busbar through grounding wires, and the grounding resistance of the dedicated grounding copper busbar is ≤4Ω.

[0028] In the first technical solution mentioned above, the installation gap between the panel of the enclosure and the DC input terminal and the through-wall adapter terminal is sealed with insulating filler glue, and the panel of the enclosure is also provided with a through-wall adapter waterproof rim covering the outer periphery of the through-wall adapter terminal.

[0029] To achieve the above objectives, the second technical solution of the present invention is: an energy storage system, the innovation of which is: including the above-mentioned distribution box, the distribution box being installed inside the cabinet of the energy storage system, the AC circuit breaker of the distribution box being electrically connected to the PCS module of the energy storage system and simultaneously supplying power to the cooling system, and the fire information relay module being connected to the fire-fighting equipment of the energy storage system.

[0030] In the second technical solution mentioned above, the distribution box is installed inside the energy storage system cabinet via a sliding guide rail, and the box is connected and fixed to the energy storage system cabinet via a guide pin and screws at the rear of the box. The root of the guide pin at the rear of the box is welded with a deformation-resistant reinforcing rib.

[0031] In the second technical solution mentioned above, the box body of the distribution box is pushed to the rear limit position of the guide rail inside the energy storage system cabinet by sliding guide rail, and the guide pin at the rear of the box body is positioned in conjunction with the limit hole of the rear limit position of the guide rail. The front limit of the sliding guide rail is fixed to the cabinet body of the energy storage system and the box body limit mounting hole by screws.

[0032] The positive effects of this invention are: after adopting the distribution box of this invention and the energy storage system using the distribution box, since the distribution box of this invention includes a box body, and a fire protection unit, a UPS unit, an AC circuit breaker assembly, and a terminal block assembly disposed inside the box body,

[0033] The fire protection unit includes a DC power supply module and a fire information relay module. The DC power supply module and the fire information relay module are electrically connected at their respective connection terminals, and the fire information relay module is used to connect to an external energy storage system.

[0034] The UPS unit includes a power conversion module and a DC battery. The DC battery is connected to the DC input port of the power conversion module. The AC circuit breaker assembly includes an AC circuit breaker and a surge protector. The surge protector is connected in series with the input terminal of the AC circuit breaker.

[0035] The AC circuit breaker is connected to a 220V power supply and is electrically connected to the conversion power module through a terminal block assembly. The DC battery is electrically connected to the DC power module.

[0036] The distribution box is installed inside the cabinet of the energy storage system. The AC circuit breaker of the distribution box is electrically connected to the PCS module of the energy storage system and simultaneously supplies power to the cooling system. The fire information relay module is connected to the fire protection equipment of the energy storage system.

[0037] The operation of the distribution box of this invention is as follows: the AC circuit breaker is connected to a 220V power supply, and the AC power conversion module converts the AC power to 24V to power the various modules in the distribution box. When the 220V power supply is interrupted, the DC battery powers the DC power module, thus achieving uninterrupted power supply.

[0038] When the energy storage system of this invention is used in conjunction with a distribution box, the front end of the AC circuit breaker is connected to the output of the PCS module of the energy storage system, and the rear end is connected to the power grid or transformer, with the rear end outputting three-phase voltage. Power take-off points are provided on the copper busbars of the AC circuit breaker, connecting to the UPS unit and terminal block assembly to supply power to the 220V equipment in the system. The AC circuit breaker transmits execution signals to the control unit, and the fire information relay module is used to control fire-fighting equipment.

[0039] The advantages of this invention are:

[0040] 1. Compared to existing integration methods on the market, integrating components with high environmental requirements into a single enclosure improves the stability of the component's operating environment. For example, if the fire suppression unit is located in the battery compartment, the high humidity inside the cabinet may cause unstable wiring.

[0041] 2. When AC circuit breakers disconnect, arcing often occurs on-site. Since they are external to the system, when arcing occurs, they can easily damage other equipment inside the cabinet. Or, when sparks and arcing occur due to faults, black smoke is produced, affecting the appearance of the system and making repairs and rectification difficult.

[0042] 3. The overall distribution box structure allows the entire distribution box to be pulled out for troubleshooting or replacement when the energy storage system malfunctions and requires maintenance.

[0043] Therefore, this invention not only has a compact structure and a modular configuration, but also has a high degree of integration. It also has the advantages of easy installation and maintenance, reduced maintenance costs, and effective heat dissipation and protection for devices, so as to meet the growing demand of energy storage systems and improve the overall performance and stability of energy storage systems. Attached Figure Description

[0044] Figure 1 This is a three-dimensional structural schematic diagram of a specific embodiment of the distribution box of the present invention;

[0045] Figure 2 This is a structural schematic diagram of the fire protection unit of the present invention;

[0046] Figure 3 This is a schematic diagram of the UPS unit of the present invention;

[0047] Figure 4 This is a schematic diagram of the structure of the AC circuit breaker unit of the present invention;

[0048] Figure 5 This is a schematic diagram of the terminal block assembly of the present invention;

[0049] Figure 6 This is a schematic diagram of the panel structure of the distribution box of the present invention;

[0050] Figure 7 This is a three-dimensional structural diagram of the distribution box body of the present invention;

[0051] Figure 8 This is a schematic diagram of the energy storage system of the present invention;

[0052] Figure 9 This is a partial structural diagram of the connection between the energy storage system and the distribution box of the present invention.

[0053] In the diagram, the components are: fire protection unit 1, DC power supply module 11, fire information relay module 12, fire protection unit fixing sheet metal part 13, fire signal input / output module 14, power connector 15, and signal connector 16.

[0054] UPS unit 2, power conversion module 21, UPS unit support sheet metal part 22, DC battery 23, UPS unit fixing sheet metal part 24,

[0055] AC circuit breaker assembly 3, AC circuit breaker 31, connecting copper busbar 32, circuit breaker assembly support sheet metal part 33, phase-to-phase insulation partition 34.

[0056] Terminal block assembly 4, waterproof cover 41, miniature circuit breaker 42, terminal block assembly mounting sheet metal parts 43, guide rail 44,

[0057] 5. Enclosure body; 51. DC input terminal; 52. Operating handle; 53. Waterproof eaves; 54. Through-wall adapter terminal; 55. Enclosure limit mounting hole; 56. Waterproof cover; 57. Aviation connector; 58. Explosion-proof valve; 59. Handle extension rod; 510. Rear guide pin of enclosure; 511. Maintenance handle; 512. Top cover plate; 513. Side wall plate.

[0058] Energy storage system 6, front limit switch 61, sliding guide rail 62, PCS module 63, cooling system 64, fire protection equipment 65. Detailed Implementation

[0059] The present invention will be further described below with reference to the accompanying drawings and the given embodiments, but is not limited thereto.

[0060] Example 1

[0061] like Figure 1 , 2 As shown in Figures 3, 4, 5, 6, and 7, a distribution box includes a box body 5, and a fire protection unit 1, a UPS unit 2, an AC circuit breaker assembly 3, and a terminal block assembly 4 disposed inside the box body 5.

[0062] The fire protection unit 1 includes a DC power supply module 11 and a fire information relay module 12. The DC power supply module 11 and the fire information relay module 12 are electrically connected at their respective connection terminals, and the fire information relay module 12 is used to connect to an external energy storage system.

[0063] The UPS unit 2 includes a power conversion module 21 and a DC battery 23, wherein the DC battery 23 is connected to the DC input port of the power conversion module 21.

[0064] The AC circuit breaker assembly 3 includes an AC circuit breaker 31 and a surge protector. The surge protector is connected in series at the input terminal of the AC circuit breaker 31. The rated voltage of the surge protector matches the rated voltage of the energy storage system (e.g., 380V AC), and the measured response time is ≤25ns.

[0065] The AC circuit breaker 31 is connected to a 220V power supply and is electrically connected to the conversion power module 21 through the terminal block assembly 4. The DC battery 23 is electrically connected to the DC power module 11.

[0066] Furthermore, such as Figure 2 As shown, when the distribution box is used in conjunction with the energy storage system, in order to facilitate the control of the fire protection unit, the fire protection unit 1 also includes a fire signal input / output module 14. The fire signal input / output module 14 is electrically connected to the corresponding connection terminal of the fire information relay module 12. The fire signal input / output module 14 is set in a sealed independent cavity, and the independent cavity is filled with moisture-proof insulating glue.

[0067] Furthermore, such as Figure 2 As shown, to achieve the connection of power and signal inside and outside the enclosure, a power connector 15 is provided on the outer wall of the enclosure 5. The wiring harness of the DC power module 11 is passed through the isolation cable tray inside the enclosure 5 and then electrically connected to the power connector 15. A signal connector 16 is provided on the outer wall of the enclosure 5, and the fire signal input / output module 14 is electrically connected to the signal connector 16. Compared with conventional Phoenix terminal connections, the connector is more reliable. The connector is equipped with a sealing gasket with a dustproof and waterproof rating of IP65, providing higher protection performance.

[0068] Furthermore, to enable real-time monitoring of partial discharge signals within the independent cavity, the fire signal input / output module 14 integrates a partial discharge online monitoring sensor, which is electrically connected to the fire information relay module 12 for real-time acquisition of partial discharge signals within the independent cavity. When the signal value detected by the partial discharge online monitoring sensor exceeds a preset threshold (e.g., 50 pC), the fire information relay module 12 immediately uploads an early warning message to the external control system and sends a command to the UPS unit 2 to switch to emergency power supply mode.

[0069] Furthermore, such as Figure 2 As shown, in order to facilitate the fixing of the DC power module and the fire information relay module, and to ensure that the fixing structural components can form fireproof and heat-insulating relationships with the enclosure, the DC power module 11 and the fire information relay module 12 are fixed to the rear side wall of the enclosure 5 by the fire unit fixing sheet metal part 13. A ceramic fiberboard fireproof and heat-insulating layer is pasted on the outside of the fire component fixing sheet metal part 13. The thickness of the ceramic fiberboard fireproof and heat-insulating layer is controlled within the range of 4mm to 6mm. Preferably, the thickness of the ceramic fiberboard fireproof and heat-insulating layer is 5mm.

[0070] Furthermore, such as Figure 3 As shown, in order to facilitate the fixing of the power conversion module and ensure the heat dissipation and fire resistance performance around the power conversion module, the power conversion module 21 is fixed to the bottom of the cabinet 5 by the UPS unit support sheet metal part 22. A heat dissipation gap is reserved around the power conversion module 21, and a fireproof baffle is installed in the heat dissipation gap.

[0071] Furthermore, such as Figure 3 As shown, in order to facilitate the fixing of the DC battery and prevent electrolyte leakage, and to enable effective and intuitive monitoring, the DC battery 23 is fixed to the rear wall of the housing 5 by the UPS unit fixing sheet metal part 24. The DC battery 23 is fitted with a leak-proof protective box, and an electrolyte collection tank is provided at the bottom of the protective box. The electrolyte collection tank is equipped with a liquid level gauge for real-time monitoring of whether there is electrolyte leakage.

[0072] Furthermore, such as Figure 6 As shown, in order to ensure the airtightness between the connector 57 and the panel, the AC input port of the power conversion module 21 is connected to the connector 57 on the panel of the housing 5, and a sealing gasket is installed at the connection between the connector 57 and the panel.

[0073] Furthermore, such as Figure 4As shown, in order to further improve the overall flame retardancy of the AC circuit breaker assembly, the AC circuit breaker assembly 3 is installed in an independent flame retardant compartment inside the enclosure 5. The AC circuit breaker 31 is fixed in the middle of the enclosure 5 by the circuit breaker assembly support sheet metal part 33. The AC circuit breaker 31 is connected to the DC input terminal 51 and the wall-through conversion terminal 54 on the panel of the enclosure 5 via a cable or copper busbar. The DC input terminal 51 and the wall-through conversion terminal 54 realize the conversion of the primary circuit inside and outside the distribution box. A dustproof and waterproof sealing gasket with an IP65 rating is added to the wall-through conversion terminal 54. The gap between the terminal and the panel is sealed with insulating filler glue.

[0074] Furthermore, such as Figure 4 As shown, in order to further improve the insulation between the AC circuit breaker and the circuit breaker assembly support sheet metal parts, an interphase insulation partition 34 is provided between the AC circuit breaker 31 and the circuit breaker assembly support sheet metal parts 33. The interphase insulation partition 34 is made of nano-composite insulation material and its thickness is 1.5 times that of the original traditional insulation board.

[0075] Furthermore, such as Figure 4 As shown, in order to facilitate the electrical connection between the AC circuit breaker and external equipment, the AC circuit breaker assembly 3 also includes a transition copper busbar 32. The AC circuit breaker 31 is electrically connected to the transition copper busbar 32, and the transition copper busbar 32 is used for electrical connection with external cables. The connection node between the AC circuit breaker 31 and the transition copper busbar 32 is covered with an anti-corona shield, which is made of copper.

[0076] Furthermore, such as Figure 6 As shown, in order to enable external switching operations on the circuit breaker and effectively prevent water from entering the circuit breaker equipment, the housing 5 is equipped with an operating component for externally operating the AC circuit breaker 31. The operating component includes an operating handle 52 and a handle extension rod 59. The operating handle 52 is connected to the AC circuit breaker 31 through the handle extension rod 59, and the outside of the operating handle 52 is covered with an impact-resistant ABS anti-collision protective sleeve.

[0077] Furthermore, such as Figure 5 As shown, in order to achieve waterproof and operable functions of the enclosure, the terminal block assembly 4 includes a waterproof cover 41, a miniature circuit breaker 42, and a terminal block. The miniature circuit breaker 42 is connected to the terminal block, and the AC circuit breaker 31 is electrically connected to the terminal block through a flame-retardant shielded cable. The operating switch of the miniature circuit breaker 42 extends to the panel of the enclosure 5, and the operating switch is located inside the openable waterproof cover 41. The waterproof cover 41 is equipped with a sealing strip and has an explosion-proof and waterproof integrated structure. The material is flame-retardant ABS. The terminal block is used as an intermediate break point for the connection between the internal components of the enclosure and the external power input.

[0078] Furthermore, such as Figure 5 As shown, to facilitate the installation of the miniature circuit breaker and to ensure a sliding fit, the miniature circuit breaker 42 is mounted on the terminal block assembly mounting sheet metal part 43 via a guide rail 44, and the terminal block assembly mounting sheet metal part 43 is fixed to the side wall of the enclosure 5. The miniature circuit breaker 42 serves as a disconnect point; when used in conjunction with an energy storage system, the power supply to the cooling equipment or fire protection unit of the energy storage system can be shut off via the miniature circuit breaker 42 when maintenance is required.

[0079] Furthermore, to ensure the airtightness of the connection between the fireproof cover and the box body, the waterproof cover 41 is provided with a high and low temperature resistant silicone rubber sealing strip at the contact position with the panel of the box body 5, and a small fire extinguishing bomb (capacity 50g) is added inside the waterproof cover 41, with the fire extinguishing bomb triggering threshold set at 80℃.

[0080] Furthermore, such as Figure 6 As shown, in order to make the enclosure 5 have explosion-proof performance, the enclosure 5 is equipped with an explosion-proof valve 58. The top opening of the independent flame-retardant compartment corresponds to the explosion-proof valve 58. When the AC circuit breaker 31 arcs, the high-temperature gas is directly discharged outside the enclosure 5 through the explosion-proof valve 58. Specifically, the arc height is determined by simulation and testing, and the installation position of the explosion-proof valve is determined. When the AC circuit breaker arcs abnormally, the internal gas can be effectively discharged to avoid the expansion of damage.

[0081] Furthermore, such as Figure 7 As shown, to further improve the rationality of the enclosure structure, enhance its waterproof performance and ease of operation, and facilitate subsequent maintenance and repair, the enclosure 5 is composed of a main shell, side wall panels 513, and a top cover plate 512. Double high and low temperature resistant silicone rubber sealing strips are installed at the connections between the top cover plate 512, the side wall panels 513, and the main shell. The cross-section of the high and low temperature resistant silicone rubber sealing strips is trapezoidal. Simultaneously, the edge of the top cover plate 512 extends into a waterproof eave with an inclination angle of 15° to 17°.

[0082] The panel of the enclosure 5 is also provided with an inspection handle 511 and a waterproof cover 56. The end face of the terminal block assembly 4 is located at the opening of the panel of the enclosure 5, and the waterproof cover 56 is located at the opening and covers the outer periphery of the terminal block.

[0083] The inner side wall of the enclosure 5 is equipped with a dedicated grounding copper busbar. The metal shells and sheet metal parts of the fire protection unit 1, UPS unit 2, AC circuit breaker assembly 3 and terminal block assembly 4 are all connected to the dedicated grounding copper busbar through grounding wires, and the grounding resistance of the dedicated grounding copper busbar is ≤4Ω.

[0084] Furthermore, such as Figure 7As shown, in order to improve the insulation and sealing between the accessories and to effectively waterproof the through-wall adapter terminal, the installation gap between the panel of the housing 5 and the DC input terminal 51 and the through-wall adapter terminal 54 is sealed with insulating filler glue, and the panel of the housing 5 is also provided with a through-wall adapter terminal waterproof eave 53 covering the outer periphery of the through-wall adapter terminal 54.

[0085] Example 2

[0086] like Figure 1 , 2 As shown in 3, 4, 5, 6, 7, 8, and 9, an energy storage system using the distribution box of Embodiment 1 is described. The distribution box is installed inside the cabinet of the energy storage system 6. The AC circuit breaker 31 of the distribution box is electrically connected to the PCS module 63 of the energy storage system 6 and simultaneously supplies power to the cooling system 64. The fire information relay module 12 is connected to the fire-fighting equipment 65 of the energy storage system 6.

[0087] Furthermore, such as Figure 9 As shown, in order to facilitate the quick positioning and assembly of the box 5 with the cabinet of the energy storage system, the box 5 of the distribution box is installed inside the cabinet of the energy storage system 6 via a sliding guide rail 62, and the box 5 is connected and fixed to the cabinet of the energy storage system 6 via a guide pin 510 at the rear of the box and screws. The root of the guide pin 510 at the rear of the box is welded with a deformation-resistant reinforcing rib, and the guide pin 510 at the rear of the box is made of 45# steel with a galvanized surface.

[0088] Furthermore, such as Figure 9 As shown, in order to further improve the accuracy of the distribution box assembly, the box body 5 of the distribution box is pushed to the rear limit position of the guide rail inside the energy storage system 6 cabinet by the sliding guide rail 62, and the guide pin 510 at the rear of the box body is positioned in conjunction with the limit hole of the rear limit position of the guide rail. The front limit 61 at the front end of the sliding guide rail 62 is fixed to the cabinet of the energy storage system 6 and the box body limit mounting hole 55 of the box body 5 by screws.

[0089] After the distribution box is assembled and debugged separately externally, it can be directly installed into the energy storage system 6 via the sliding guide rail 62. The box body 5 of the distribution box and the cabinet of the energy storage system 6 are connected and fixed by the guide pin 510 at the rear of the box body and screws.

[0090] Specifically, the box body 5 of the distribution box is pushed to the rear limit position of the guide rail 62 by the sliding guide rail 62, and the guide pin 510 is positioned in cooperation with the rear limit hole of the guide rail. The front limit 61 of the sliding guide rail 62 is fixed to the box limit mounting hole 55 of the energy storage system 6 and the box body 5 of the distribution box using M5 screws.

[0091] After completing the connection of the external wiring harness to the aviation plug 57 and the through-wall adapter terminal 54, subsequent tests can be carried out; when the internal equipment of the distribution box is damaged, remove the fixing screws of the front limit 61, and pull out the distribution box along the sliding guide rail 62 through the maintenance handle 511. Depending on the location of the faulty device, choose to remove the side wall panel 513 for separate maintenance, or remove the top cover 512 and the side wall panel 513 for maintenance at the same time.

[0092] The operation of the distribution box of this invention is as follows: the AC circuit breaker is connected to a 220V power supply, and the AC power conversion module converts the AC power to 24V to power the various modules in the distribution box. When the 220V power supply is interrupted, the DC battery powers the DC power module, thus achieving uninterrupted power supply.

[0093] When the energy storage system of this invention is used in conjunction with the distribution box, the front end of the AC circuit breaker is connected to the output of the PCS module of the energy storage system, and the rear end is connected to the power grid or transformer. The rear end outputs three-phase voltage. The copper busbar of the AC circuit breaker is provided with a power take-off point, which is connected to the UPS unit and the terminal block assembly to supply power to the 220V equipment in the system. Specifically, the PCS module outputs three-phase 400V voltage, and the N-phase 220V power supply is connected to the external A phase and the wall-penetrating conversion terminal of the AC circuit breaker. The AC circuit breaker transmits the execution signal to the control unit, and the fire information relay module is used to control the fire-fighting equipment.

[0094] The advantages of this invention are:

[0095] 1. Compared to existing integration methods on the market, integrating components with high environmental requirements into a single enclosure improves the stability of the component's operating environment. For example, if the fire suppression unit is located in the battery compartment, the high humidity inside the cabinet may cause unstable wiring.

[0096] 2. When AC circuit breakers disconnect, arcing often occurs on-site. Since they are external to the system, when arcing occurs, they can easily damage other equipment inside the cabinet. Or, when sparks and arcing occur due to faults, black smoke is produced, affecting the appearance of the system and making repairs and rectification difficult.

[0097] 3. The overall distribution box structure allows the entire distribution box to be pulled out for troubleshooting or replacement when the energy storage system malfunctions and requires maintenance.

[0098] Therefore, this invention not only has a compact structure and a modular configuration, but also has a high degree of integration. It also has the advantages of easy installation and maintenance, reduced maintenance costs, and effective heat dissipation and protection for devices, so as to meet the growing demand of energy storage systems and improve the overall performance and stability of energy storage systems.

[0099] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A distribution box, characterized in that: Includes a housing (5), and inside the housing (5) are a fire protection unit (1), a UPS unit (2), an AC circuit breaker assembly (3), and a terminal block assembly (4). The fire protection unit (1) includes a DC power supply module (11) and a fire information relay module (12). The DC power supply module (11) and the fire information relay module (12) are electrically connected at their respective connection terminals. The fire information relay module (12) is used to connect to an external energy storage system. The UPS unit (2) includes a power conversion module (21) and a DC battery (23), wherein the DC battery (23) is connected to the DC input port of the power conversion module (21). The AC circuit breaker assembly (3) includes an AC circuit breaker (31) and a surge protector, wherein the surge protector is connected in series at the input terminal of the AC circuit breaker (31). The AC circuit breaker (31) is connected to a 220V power supply and is electrically connected to the conversion power module (21) through the terminal block assembly (4). The DC battery (23) is electrically connected to the DC power module (11).

2. The distribution box according to claim 1, characterized in that: The fire unit (1) also includes a fire signal input / output module (14), which is electrically connected to the corresponding connection terminal of the fire information relay module (12). The fire signal input / output module (14) is set in a sealed independent cavity, and the independent cavity is filled with moisture-proof insulating glue.

3. The distribution box according to claim 1, characterized in that: A power connector (15) is provided on the outer wall of the housing (5). The wire harness of the DC power module (11) is passed through the isolation groove in the housing (5) and then electrically connected to the power connector (15).

4. The distribution box according to claim 2, characterized in that: The outer wall of the enclosure (5) is provided with a signal connector (16), and the fire signal input / output module (14) is electrically connected to the signal connector (16).

5. The distribution box according to claim 2, characterized in that: The fire signal input / output module (14) also integrates a partial discharge online monitoring sensor, and the partial discharge online monitoring sensor is electrically connected to the fire information relay module (12) for real-time acquisition of partial discharge signals inside the independent cavity.

6. The distribution box according to claim 1, characterized in that: The DC power module (11) and the fire information relay module (12) are fixed to the rear side wall of the box (5) by the fire unit fixing sheet metal part (13), and the outside of the fire component fixing sheet metal part (13) is covered with a ceramic fiber board fireproof and heat insulation layer, the thickness of which is controlled within the range of 4mm to 6mm.

7. The distribution box according to claim 1, characterized in that: The power conversion module (21) is fixed to the bottom of the box (5) by the UPS unit support sheet metal part (22). A heat dissipation gap is reserved around the power conversion module (21), and a fireproof baffle is installed in the heat dissipation gap.

8. The distribution box according to claim 1, characterized in that: The DC battery (23) is fixed to the rear wall of the box (5) by the UPS unit fixing sheet metal part (24). The DC battery (23) is fitted with a leak-proof protective box, and an electrolyte collection tank is opened at the bottom of the protective box. The electrolyte collection tank is equipped with a liquid level gauge for real-time monitoring of whether there is any leakage of electrolyte.

9. The distribution box according to claim 1, characterized in that: The AC input port of the power conversion module (21) is connected to the aviation plug (57) on the panel of the enclosure (5), and a sealing gasket is installed at the connection between the aviation plug (57) and the panel.

10. The distribution box according to claim 1, characterized in that: The AC circuit breaker assembly (3) is installed in an independent flame-retardant compartment inside the enclosure (5). The AC circuit breaker (31) is fixed in the middle of the enclosure (5) by the circuit breaker assembly support sheet metal part (33). The AC circuit breaker (31) is connected to the DC input terminal (51) and the wall-penetrating adapter terminal (54) on the panel of the enclosure (5) by a cable or copper busbar.

11. The distribution box according to claim 10, characterized in that: An interphase insulating partition (34) is provided between the AC circuit breaker (31) and the circuit breaker assembly support sheet metal part (33).

12. The distribution box according to claim 1, characterized in that: The AC circuit breaker assembly (3) also includes a transition copper busbar (32), the AC circuit breaker (31) is electrically connected to the transition copper busbar (32), and the transition copper busbar (32) is used for electrical connection with an external cable. The connection node between the AC circuit breaker (31) and the transition copper busbar (32) is covered with an anti-corona shield.

13. The distribution box according to claim 1, characterized in that: The housing (5) is provided with an operating component for opening and closing the externally operated AC circuit breaker (31). The operating component includes an operating handle (52) and a handle extension rod (59). The operating handle (52) is connected to the AC circuit breaker (31) through the handle extension rod (59), and the outside of the operating handle (52) is covered with an impact-resistant anti-collision protective sleeve.

14. The distribution box according to claim 1, characterized in that: The terminal block assembly (4) includes a waterproof cover (41), a miniature circuit breaker (42) and a terminal block. The miniature circuit breaker (42) is connected to the terminal block, and the AC circuit breaker (31) is electrically connected to the terminal block via a flame-retardant shielded cable. The operating switch of the miniature circuit breaker (42) extends to the panel of the housing (5) and is located inside the openable waterproof cover (41).

15. The distribution box according to claim 14, characterized in that: The miniature circuit breaker (42) is mounted on the terminal block assembly mounting sheet metal part (43) via a guide rail (44), and the terminal block assembly mounting sheet metal part (43) is fixed to the side wall of the enclosure (5).

16. The distribution box according to claim 14, characterized in that: The waterproof cover (41) is provided with a high and low temperature resistant silicone rubber sealing strip at the contact position with the panel of the box (5), and a small fire extinguishing bomb is added inside the waterproof cover (41).

17. The distribution box according to claim 10, characterized in that: The enclosure (5) is equipped with an explosion-proof valve (58), and the top opening of the independent flame-retardant compartment corresponds to the explosion-proof valve (58). When the AC circuit breaker (31) is arcing, the high-temperature gas is directly discharged outside the enclosure (5) through the explosion-proof valve (58).

18. The distribution box according to claim 1, characterized in that: The enclosure (5) is composed of a main shell, side wall panels (513), and a top cover (512). Double high and low temperature resistant silicone rubber sealing strips are provided at the connections between the top cover (512), the side wall panels (513), and the main shell. The cross-section of the high and low temperature resistant silicone rubber sealing strips is trapezoidal. Additionally, the edge of the top cover (512) extends into a waterproof eave with an inclination angle of 15° to 17°. The panel of the enclosure (5) is also provided with an inspection handle (511) and a waterproof cover (56). The end face of the terminal block assembly (4) is located at the opening of the panel of the enclosure (5), and the waterproof cover (56) is located at the opening and covers the outer periphery of the terminal block. The inner side wall of the enclosure (5) is provided with a dedicated grounding copper busbar. The metal shells and sheet metal parts of the fire protection unit (1), UPS unit (2), AC circuit breaker assembly (3) and terminal block assembly (4) are all connected to the dedicated grounding copper busbar through grounding wires, and the grounding resistance of the dedicated grounding copper busbar is ≤4Ω.

19. The distribution box according to claim 10, characterized in that: The mounting gap between the panel of the enclosure (5) and the DC input terminal (51) and the through-wall adapter terminal (54) is sealed with insulating filler glue, and the panel of the enclosure (5) is also provided with a through-wall adapter terminal waterproof eave (53) covering the outer periphery of the through-wall adapter terminal (54).

20. An energy storage system, characterized in that: The distribution box includes any one of claims 1 to 19, the distribution box is installed inside the cabinet of the energy storage system (6), the AC circuit breaker (31) of the distribution box is electrically connected to the PCS module (63) of the energy storage system (6) and simultaneously supplies power to the cooling system (64), and the fire information relay module (12) is connected to the fire-fighting equipment (65) of the energy storage system (6).

21. The energy storage system according to claim 20, characterized in that: The distribution box (5) is installed inside the cabinet of the energy storage system (6) via a sliding guide rail (62), and the box (5) is connected and fixed to the cabinet of the energy storage system (6) via a guide pin (510) at the rear of the box and screws. The root of the guide pin (510) at the rear of the box is welded with a deformation-resistant reinforcing rib.

22. The energy storage system according to claim 21, characterized in that: The box body (5) of the distribution box is pushed to the rear limit position of the guide rail inside the cabinet of the energy storage system (6) by the sliding guide rail (62), and the guide pin (510) at the rear of the box body is positioned in conjunction with the limit hole of the rear limit of the guide rail. The front limit (61) at the front end of the sliding guide rail (62) is fixed to the cabinet of the energy storage system (6) and the box body limit mounting hole (55) of the box body (5) by screws.

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