High-voltage box for energy storage cabinet

Abstract

The utility model relates to the technical field of energy storage cabinets, in particular to a high-voltage box for an energy storage cabinet, which comprises a box cover and a box shell with an upward opening, and an isolating switch, a positive electrode circuit assembly, a negative electrode circuit assembly and a pre-charging circuit assembly are arranged in the box shell. The middle of the positive electrode circuit assembly and the middle of the negative electrode circuit assembly are communicated with the disconnecting switch and control circuit on-off through the disconnecting switch, the two ends of the positive electrode circuit assembly and the two ends of the negative electrode circuit assembly are each provided with a wiring terminal, the wiring terminals are arranged on a panel located on the front side face of the box shell, and the panel is further provided with a rotating handle and connected with the disconnecting switch through a connecting rod. The positive electrode circuit assembly is communicated with the pre-charging circuit assembly, the pre-charging circuit assembly comprises a pre-charging resistor and a pre-charging relay which are connected in series, the pre-charging resistor is attached to the vertical wall of the inner side of the box shell, and a heat dissipation mechanism is further arranged in the box shell; according to the utility model, a double-fusing mechanism with high safety is arranged, components are easy to assemble through partition layout and modular design, and dustproof and waterproof performance is guaranteed while efficient heat dissipation is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage cabinets, and particularly relates to a high-voltage box for an energy storage cabinet. Background Art

[0002] The high-voltage box of the energy storage cabinet is a high-voltage circuit management unit connecting the battery cluster and the PCS, and has functions such as battery cluster voltage / current acquisition, contactor control and protection. Its state is directly related to the safety and stability of the energy storage system. When the high-voltage box works, a large amount of heat will be generated inside, so a suitable thermal management scheme needs to be adopted.

[0003] An isolating switch, a pre-charge relay, a fuse, a shunt, a pre-charge resistor, a battery cluster management unit (BCU), a switching power supply, etc. are installed in the high-voltage box. Unreasonable structural design will affect the assembly efficiency of components, and will also cause problems such as poor heat dissipation performance and inconvenient maintenance. Content of the Utility Model

[0004] The purpose of the utility model is to provide a high-voltage box for an energy storage cabinet, aiming to improve its safety and reliability, simplify the structure, enhance the heat dissipation performance and facilitate maintenance.

[0005] To solve the above technical problems, the scheme adopted by the utility model is:

[0006] A high-voltage box for an energy storage cabinet includes a box cover and a box shell with an upward open mouth. An isolating switch, a positive circuit component, a negative circuit component and a pre-charge circuit component are arranged in the box shell. The middle of the positive circuit component and the negative circuit component is connected to the same isolating switch and its circuit on-off is controlled by it. Wiring terminals are arranged at both ends of the positive circuit component and the negative circuit component. The wiring terminals are arranged on a panel located on the front side of the box shell. A rotary handle is also arranged on the panel. The rotary handle is connected to the isolating switch through a connecting rod. The positive circuit component is connected to the pre-charge circuit component. The pre-charge circuit component includes a series-connected pre-charge resistor and a pre-charge relay. The pre-charge resistor is attached to the inner vertical wall of the box shell. A heat dissipation mechanism is also arranged in the box shell. The heat dissipation mechanism includes a fan;

[0007] The fan is connected to the box shell through a lifting bracket. The lifting bracket includes a base. A sliding table that moves up and down is movably arranged on the base. The sliding table is connected to a lifting motor through a reciprocating screw nut pair.

[0008] Furthermore, the wiring terminals include a first positive terminal, a first negative terminal, a second positive terminal and a second negative terminal. The first positive terminal and the first negative terminal are used for docking with the battery pack end of the energy storage cabinet. The second positive terminal and the second negative terminal are used for docking with the PCS end of the energy storage cabinet.

[0009] Further, a fuse and a main relay are connected in series between the first positive terminal and the disconnector, a main relay and a shunt are connected in series between the first negative terminal and the disconnector, and a fuse is provided between the second negative terminal and the disconnector.

[0010] Further, the pre-charge circuit component is connected in parallel with the main relay in the positive circuit component.

[0011] Further, the number of fuses and main relays in the box shell is 2 each.

[0012] Further, fixing ears are provided on the front side of the box shell, screw holes are provided on the fixing ears, and a conductive ring that is electrically conductive with the box shell is provided around the screw holes, and the surface of the conductive ring is coated with conductive paint.

[0013] Further, the reciprocating screw-nut pair includes a reciprocating screw rod and a nut fixedly connected to the sliding table, the nut is movably sleeved outside the reciprocating screw rod, and the reciprocating screw rod is coaxially connected to the rotating shaft of the lifting motor.

[0014] Further, a battery cluster management unit (BCU) and a 12V / 24V power supply are provided in the box shell, and the 12V / 24V power supply supplies power to the battery cluster management unit (BCU) and the fan.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] The internal components of the present utility model are reasonably arranged, with high space utilization rate and good heat dissipation performance. Through zoned layout and modular design, the installation positions of the components are reasonably planned, and the components are easy to assemble; fuses are provided in both the positive and negative circuits, with high safety, avoiding overcharging or over-discharging of the battery pack; the setting position of the pre-charge resistor enables high heat dissipation efficiency, and the heat dissipation mechanism enables a large coverage area of the internal air flow circulation, with few dead corners, thus achieving efficient cooling and extending the service life of the equipment; through internal circulating air flow and box body heat dissipation, there are no large-area through holes with the outside, and the dust and water protection performance is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0018] Figure 2 is a top-view structural schematic diagram of the present utility model;

[0019] Figure 3 is an electrical main circuit schematic diagram of the present utility model;

[0020] Figure 4 is a three-dimensional structural schematic diagram of the heat dissipation mechanism in the present utility model;

[0021] Figure 5 Side structure schematic diagram of the heat dissipation mechanism in the present utility model;

[0022] Figure 6 Schematic diagram of the reciprocating lead screw in the present utility model;

[0023] Figure 7 Schematic diagram of the fixing ear in the present utility model.

[0024] In the figure: 1, box cover; 2, box shell; 2a, panel; 2b, fixing ear; 2b-1, conductive ring; 3, disconnecting switch; 4, positive circuit component; 5, negative circuit component; 6, precharge circuit component; 6a, precharge resistor; 6b, precharge relay; 7, terminal block; 7a, first positive terminal; 7b, first negative terminal; 7c, second positive terminal; 7d, second negative terminal; 8, fan; 9, fuse; 10, main relay; 11, lifting bracket; 11a, base; 11b, sliding table; 11c, lifting motor; 11d, reciprocating lead screw; 12, shunt. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0026] As Figures 1 to 7 shown, a high-voltage box for an energy storage cabinet includes a box cover 1 and a box shell 2 with an upward open mouth. A disconnecting switch 3, a positive circuit component 4, a negative circuit component 5, and a precharge circuit component 6 are arranged in the box shell 2. The middle of the positive circuit component 4 and the negative circuit component 5 is connected to the same disconnecting switch 3 and its circuit on-off is controlled by it;

[0027] Terminal blocks 7 are arranged at both ends of the positive circuit component 4 and the negative circuit component 5. The terminal blocks 7 are arranged on the panel 2a on the front side of the box shell 2. The terminal blocks 7 include a first positive terminal 7a, a first negative terminal 7b, a second positive terminal 7c, and a second negative terminal 7d. The adjacent first positive terminal 7a and first negative terminal 7b are used to dock with the battery pack end of the energy storage cabinet, and the adjacent second positive terminal 7c and second negative terminal 7d are used to dock with the PCS end of the energy storage cabinet. PCS is the full name of the power conversion system for energy storage, which is mainly used to control the charging and discharging process of the storage battery and realize the AC-DC conversion.

[0028] A rotating handle is also provided on the panel 2a. The rotating handle is connected to the disconnector 3 through a connecting rod. By operating the rotating handle outside the housing 2, the disconnector 3 can be controlled to realize the manual switching of the circuit. The positive circuit component 4 is connected to the pre-charge circuit component 6. The pre-charge circuit component 6 includes a series-connected pre-charge resistor 6a and a pre-charge relay 6b. The pre-charge resistor 6a is attached to the inner vertical wall of the housing 2 for more efficient heat conduction. There are 2 fuses 9 and 2 main relays 10 arranged in the housing 2. A series-connected fuse 9 and main relay 10 are provided between the first positive terminal 7a and the disconnector 3. A series-connected main relay 10 and a shunt 12 are provided between the first negative terminal 7b and the disconnector 3. The shunt 12 is used for current measurement. A fuse 9 is provided between the second negative terminal 7d and the disconnector 3. The main relay 10 is used to realize the automatic switching of the circuit, and the fuse 9 is used to realize over-current protection to avoid overcharging or over-discharging of the battery pack.

[0029] Specifically, the pre-charge circuit component 6 is connected in parallel with the main relay 10 in the positive circuit component 4. The rated power of the pre-charge resistor 6a ≥ 300W. It uses a high-temperature resistant material as the resistor matrix, and is potted with a highly insulating and non-combustible filling material, which is closely combined with the resistor wire of the resistor matrix and the aluminum alloy shell, having high stability and heat conductivity. Its shell is in contact with the inner vertical wall of the housing 2 with a larger area, and the heat conduction effect is good. It not only significantly reduces the surface temperature rise of the resistor body during operation, but also greatly improves its load-bearing capacity and long-term stability. The high-resistance characteristic of the pre-charge resistor 6a can reduce the instantaneous change of the current, reduce the pressure on electrical equipment and the battery, which can protect the battery from overloading and prevent damage to the power system caused by over-current, and improve the reliability and safety of the high-voltage box.

[0030] When the high-voltage box is working, internal components such as the pre-charge resistor 6a and the shunt 12 will generate heat. Therefore, it is necessary to dissipate heat and control the temperature inside the housing 2. Thus, a heat dissipation mechanism is provided in the housing 2 to accelerate the air flow circulation. The heat dissipation mechanism includes a fan 8. The fan 8 is connected to the housing 2 through a lifting bracket 11. The lifting bracket 11 includes a base 11a. A slidable table 11b that can move up and down is movably provided on the base 11a. The slidable table 11b is connected to a lifting motor 11c through a reciprocating lead screw nut pair. The reciprocating lead screw nut pair includes a reciprocating lead screw 11d and a nut fixedly connected to the slidable table 11b. The nut is movably sleeved outside the reciprocating lead screw 11d. The reciprocating lead screw 11d is coaxially connected to the rotating shaft of the lifting motor 11c. Specifically, as Figure 6As shown in the figure, the reciprocating lead screw 11d is provided with two thread grooves having the same pitch and opposite helix directions, and the two ends are connected by transition curves. When the lifting motor 11c drives the reciprocating lead screw 11d to rotate, the side surface of the spiral groove pushes the nut that mates with the spiral groove to perform an axial reciprocating motion, ultimately realizing the reciprocating lifting control of the position of the fan 8, expanding the coverage area of the heat dissipation air flow, having a large circulating flow space, uniform heat dissipation inside the box shell 2, few dead corners, and good heat dissipation and cooling effects.

[0031] On the front side surface of the box shell 2, there are fixed ears 2b for connecting with the energy storage cabinet. The fixed ears 2b are provided with screw holes, and a conductive ring 2b-1 that forms electrical conduction with the box shell 2 is provided around the screw holes. The surface of the conductive ring 2b-1 is coated with conductive paint. The setting of the conductive ring 2b-1 enables no separate grounding position to be provided outside the box shell 2, and the grounding connection can be completed while being fixed to the energy storage cabinet. The specific formation method of the conductive ring 2b-1: When spraying ordinary anti-rust paint on the whole box shell 2, the conductive ring 2b-1 is masked. After the ordinary anti-rust paint is cured, conductive paint is applied to the conductive ring 2b-1. The conductive paint directly contacts the metal plate of the box shell 2 to conduct electricity. When the box shell 2 is installed in the energy storage cabinet, the conductive fixing screw contacts the conductive paint to conduct electricity.

[0032] Inside the box shell 2, there is a battery cluster management unit (BCU) and a 12V / 24V power supply. The 12V / 24V power supply supplies power to the battery cluster management unit (BCU), the fan 8, and the lifting motor 11c. The main functions of the BCU include but are not limited to: monitoring the state of the battery cluster, such as voltage, current, temperature, etc.; managing the charging and discharging process of the battery cluster to optimize the battery usage efficiency; and performing information interaction with other control units (such as BAU and BMU) to jointly form a battery management system (BMS) to achieve comprehensive monitoring and management of the entire energy storage system.

[0033] ‌In the box shell 2, the large-current circuit is connected by a hard copper busbar. The hard copper busbar has good electrical conductivity and mechanical strength, ‌can work stably in an environment of high voltage and ‌large current, and at the same time has the advantage of being convenient for loading and unloading. ‌

[0034] When a high-voltage box for an energy storage cabinet of the present utility model works, by operating the rotary handle outside the box shell 2, the on-off of the internal positive circuit component and negative circuit component can be controlled. The internal fan 8 reciprocates up and down while accelerating the air flow circulation, expanding the coverage area of the heat dissipation air flow, having a large circulating flow space, uniform heat dissipation inside the box shell 2. Fuses 9 are provided in both the positive and negative circuits. The dual-purpose fuse 9 realizes over-current protection to avoid overcharging or over-discharging of the battery pack, and has high safety. This solution improves the space utilization rate, enhances the heat dissipation effect through optimized structural design, thereby significantly improving the safety and efficiency of the energy storage system.

[0035] As described above, it is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. It should be noted that for those of ordinary skill in the art, any changes, modifications or additions made without departing from the concept of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A high-voltage box for an energy storage cabinet, characterized in that: The invention comprises a box cover (1) and a box shell (2) with an opening upwardly, wherein an isolating switch (3), a positive circuit assembly (4), a negative circuit assembly (5) and a pre-charging circuit assembly (6) are arranged in the box shell (2), wherein the middle of the positive circuit assembly (4) and the negative circuit assembly (5) are connected to the same isolating switch (3) and the circuit is switched on and off by the isolating switch (3), and both ends of the positive circuit assembly (4) and the negative circuit assembly (5) are provided with connection terminals (7), and the connection terminals (7) are arranged at the box shell ( 2), the panel (2a) is also provided with a rotary handle, the rotary handle is connected to the isolating switch (3) through a connecting rod, the positive circuit assembly (4) is connected to the pre-charging circuit assembly (6), the pre-charging circuit assembly (6) includes a pre-charging resistor (6a) and a pre-charging relay (6b) connected in series, the pre-charging resistor (6a) is arranged on the inner side wall of the box shell (2), and a heat dissipation mechanism is also arranged in the box shell (2), and the heat dissipation mechanism includes a fan (8); The fan (8) is connected to the box shell (2) via a lifting bracket (11); the lifting bracket (11) comprises a base (11a); a slide (11b) is movably arranged on the base (11a); and the slide (11b) is connected to a lifting motor (11c) via a reciprocating screw nut pair.

2. A high-voltage box for an energy storage cabinet according to claim 1, characterized in that: The connection terminal (7) comprises a first positive terminal (7a), a first negative terminal (7b), a second positive terminal (7c) and a second negative terminal (7d); the first positive terminal (7a) and the first negative terminal (7b) are used for connecting with the battery pack end, and the second positive terminal (7c) and the second negative terminal (7d) are used for connecting with the PCS end.

3. A high-voltage box for an energy storage cabinet according to claim 2, characterized in that: A fuse (9) and a main relay (10) connected in series are provided between the first positive terminal (7a) and the isolating switch (3), a main relay (10) and a shunt (12) connected in series are provided between the first negative terminal (7b) and the isolating switch (3), and a fuse (9) is provided between the second negative terminal (7d) and the isolating switch (3).

4. A high-voltage box for an energy storage cabinet according to claim 3, characterized in that: The pre-charging circuit component (6) is connected in parallel with the main relay (10) in the positive circuit component (4).

5. A high-voltage box for an energy storage cabinet according to claim 4, characterized in that: The number of fuses (9) and main relays (10) in the box shell (2) is two.

6. A high-voltage box for an energy storage cabinet according to claim 1, characterized in that: The front side of the box shell (2) is provided with a fixing ear (2b), the fixing ear (2b) is provided with a screw hole, and a conductive ring (2b-1) is provided around the screw hole to form electrical conduction with the box shell (2), and the surface of the conductive ring (2b-1) is coated with conductive paint.

7. A high-voltage box for an energy storage cabinet according to claim 1, characterized in that: The reciprocating screw nut pair comprises a reciprocating screw (11d) and a nut fixedly connected to a slide (11b); the nut is movably sleeved outside the reciprocating screw (11d); and the reciprocating screw (11d) is coaxially connected to a rotating shaft of a lifting motor (11c).

8. The high-voltage box for an energy storage cabinet according to claim 1, characterized in that: A battery cluster management unit BCU and a 12V / 24V power supply are arranged in the box shell (2), and the 12V / 24V power supply supplies power to the battery cluster management unit BCU and the fan (8).

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