A centralized charging protection device

Abstract

The utility model provides a kind of centralized charging protection device.The centralized charging protection device includes cabinet, is located the storage cabinet of the lower part of the cabinet and is located the heat sink of the back of the cabinet, the cabinet is formed with equipment layer and several charging layers by partition, the heat sink with the charging layer is communicated;The storage cabinet includes the cabinet body connected with the cabinet, the cabinet door connected with the cabinet body by hinge, and the lock set on the cabinet door.The utility model adds heat sink on the back of cabinet, and heat sink is communicated with charging layer, can promptly dissipate the heat generated during charging process, reduce the influence of surrounding environment overheating on battery.

Description

Technical Field

[0001] This utility model relates to the field of power electronics and safe charging technology, and in particular to a centralized charging protection device. Background Technology

[0002] In the construction of large-scale projects such as housing construction, bridges, water conservancy and hydropower, and high-speed railways, a large number of precision instruments and equipment are required to ensure the accuracy and smooth completion of the project. These precision instruments and equipment are powered by batteries, which therefore need to be charged. The current charging method involves stacking multiple precision instruments together and using multi-socket power strips for charging. This method not only results in messy charging cables and chaotic on-site management, but also easily leads to accidents such as overheating or even combustion due to overvoltage or overcharging, as well as leakage caused by aging power cords or charger malfunctions.

[0003] Some solutions address the aforementioned issues using centralized charging cabinets, such as the drone lithium battery centralized charging safety management cabinet and charging control method disclosed in patent application publication number CN114793004A. This cabinet includes a cabinet body and a door, and houses a charging management and control module, multiple charging drawers, and lithium batteries. It not only enables unmanned automatic charging and discharging management of multiple battery groups but also provides various protections during the charging process. However, it still has the following two problems:

[0004] (i) It does not have a heat dissipation function. When multiple lithium batteries are charged, a large amount of heat is dissipated, especially in high-temperature environments. If the heat is not dissipated in time, it will affect the service life of the lithium batteries.

[0005] (ii) There is no storage space for backup equipment (such as lithium batteries). When backup equipment is needed, it must be searched for in other storage locations, which reduces efficiency. Utility Model Content

[0006] The purpose of this utility model is to provide a centralized charging protection device to solve the problems of environmental overheating and lack of space for storing backup equipment during the charging process.

[0007] The technical solution of this utility model is: a centralized charging protection device, including a cabinet, a storage cabinet located at the bottom of the cabinet, and a heat dissipation device located at the back of the cabinet. The cabinet is formed by partitions to form an equipment layer and several charging layers. The heat dissipation device is connected to the charging layers.

[0008] The locker includes a cabinet body connected to the cabinet, a cabinet door connected to the cabinet body via hinges, and a door lock installed on the cabinet door.

[0009] In the above solution, by adding a heat dissipation device to the back of the cabinet and connecting the heat dissipation device to the charging layer, the heat generated during the charging process can be dissipated in a timely manner, reducing the impact of overheating of the surrounding environment on the battery. In addition, a storage cabinet is added at the bottom of the cabinet to centrally store spare equipment. When the spare equipment is needed, it can be quickly and conveniently retrieved from the storage cabinet, improving efficiency.

[0010] Preferably, the equipment layer is provided with a hierarchical power distribution module, which includes a main circuit breaker and multiple branch circuits connected in parallel with the main circuit breaker; each charging layer is provided with multiple power sockets, and the multiple branch circuits are connected to the power sockets one by one; an input cable is connected to the main circuit breaker.

[0011] Preferably, each branch circuit is provided with an air switch for switching the branch circuit on and off, and / or each branch circuit is provided with a current transformer for switching the branch circuit on and off.

[0012] Preferably, when the current transformer of a certain branch circuit is disconnected, the three branch circuits adjacent to that branch circuit are also disconnected.

[0013] Preferably, the equipment layer is further provided with a multi-level protection and control module, which is electrically connected to the hierarchical power distribution module.

[0014] Preferably, the multi-level protection control module includes an overvoltage protection unit for monitoring charging voltage, and / or the multi-level protection control module further includes an overcharge protection unit for timed power-off control via a clock chip, and / or the multi-level protection control module further includes a temperature protection unit for power-off control via temperature monitoring.

[0015] Preferably, the multi-level protection control module further includes a charging status judgment unit electrically connected to the main circuit breaker.

[0016] Preferably, the power distribution structure of the branch circuit is as follows: maximum load current of a single circuit ≤16A, line impedance ≤0.1Ω, and distance between adjacent circuits ≥15mm.

[0017] Preferably, the upper surface of both the partition and the storage cabinet is provided with a flame-retardant pad, which includes a silicone rubber pad, a mica board and a ceramic fiber cloth stacked sequentially from bottom to top, and the silicone rubber pad is connected to the partition.

[0018] Compared with related technologies, the beneficial effects of this utility model are as follows:

[0019] I. This utility model adds a heat dissipation device to the back of the cabinet, and the heat dissipation device is connected to the charging layer, which can dissipate the heat generated during the charging process in a timely manner and reduce the impact of the surrounding environment overheating on the battery.

[0020] Second, this utility model adds a storage cabinet at the bottom of the cabinet, which can centrally store spare equipment. When the spare equipment is needed, it can be quickly and conveniently retrieved from the storage cabinet, thus improving efficiency.

[0021] Third, this utility model effectively solves a series of technical problems such as overvoltage, overcharging, overheating, multiple charging on one line, chaotic charging platform, electric shock prevention, and automatic power-off when fully charged, thereby achieving a fast and safe charging environment to ensure the safety of equipment and property. Attached Figure Description

[0022] Figure 1 A three-dimensional structural diagram of the centralized charging protection device provided by this utility model;

[0023] Figure 2 A front view structural schematic diagram of the centralized charging protection device provided by this utility model;

[0024] Figure 3 A rear view structural schematic diagram of the centralized charging protection device provided by this utility model;

[0025] Figure 4 A side view of the centralized charging protection device provided by this utility model.

[0026] In the attached diagram: 1. Cabinet; 11. Partition; 12. Equipment layer; 13. Charging layer; 14. Side panel; 15. Back panel; 2. Hierarchical power distribution module; 21. Main circuit breaker; 22. Branch circuit; 221. Air switch; 222. Current transformer; 223. Branch relay; 3. Multi-level protection control module; 31. Overvoltage protection unit; 32. Overcharge protection unit; 33. Temperature protection unit; 34. Charging status judgment unit; 4. Flame-retardant pad; 5. Power socket; 6. Storage cabinet; 61. Cabinet body; 62. Cabinet door; 63. Door lock; 7. Heat dissipation device; 8. Input cable. Detailed Implementation

[0027] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0028] like Figures 1-4 As shown, the centralized charging protection device provided in this embodiment includes a cabinet 1, a hierarchical power distribution module 2, a multi-level protection control module 3, a flame-retardant pad 4, a power socket 5, a storage cabinet 6, a heat dissipation device 7, and an input cable 8.

[0029] The cabinet 1 includes a back panel 15, side panels 14 connected to both ends of the back panel 15, and multiple partitions 11 connecting the back panel 15 and the two side panels 14. The multiple partitions 11 divide the cabinet 1 into a device layer 12 and several charging layers 13. The device layer 12 is located at the top.

[0030] The equipment layer 12 includes a hierarchical power distribution module 2 and a multi-level protection control module 3. The hierarchical power distribution module 2 includes a main circuit breaker 21 and multiple branch circuits 22 connected in parallel with the main circuit breaker 21. The power distribution structure of the branch circuits 22 is as follows: maximum single-circuit load current ≤ 16A, line impedance ≤ 0.1Ω, and adjacent circuit spacing ≥ 15mm. The main circuit breaker 21 has a rated current ≥ 63A and integrates leakage current protection (operating current ≤ 30mA). An arc fault circuit interrupter (AFCI) is connected in parallel to the output terminal of the main circuit breaker 21, using high-frequency sampling (200kHz) to identify characteristic arc waveforms with an arc extinguishing time ≤ 15ms (compliant with UL 1699 standard). An input cable 8 is connected to the main circuit breaker 21. The input cable 8 is connected to the mains power.

[0031] Each charging layer 13 is provided with multiple power sockets 5, and multiple branch circuits 22 are connected to the power sockets 5 one-to-one. The power sockets 5 are mounted on the inner surface of the back panel 15. The power sockets 5 are equipped with a USB-PD / QC3.0 fast charging interface and an XT60 DC interface.

[0032] Each branch circuit 22 is equipped with an air switch 221 for switching the branch circuit 22 on and off, and / or each branch circuit 22 is equipped with a current transformer 222 for switching the branch circuit 22 on and off. The air switch 221 provides electrical interlocking: if the charging interface on the power socket 5 is not fully inserted, the air switch 221 cannot close, and the corresponding charging circuit is disconnected. The current transformer 222 provides thermal interlocking: when the temperature on a branch circuit 22 is >55℃, the power supply to the three adjacent branch circuits 22 is simultaneously cut off.

[0033] As needed, a branch relay 223 for switching the branch circuit 22 on and off is provided on each branch circuit 22. The multi-level protection control module 3 includes an overvoltage protection unit 31, an overcharge protection unit 32, a temperature protection unit 33, and a charging status judgment unit 34.

[0034] The overvoltage protection unit 31 uses an LM393 voltage comparator to monitor the charging voltage on the branch circuit 22 in real time. When the voltage exceeds the set threshold Vmax, it triggers the main circuit breaker 21 or the branch relay 223 on the branch circuit 22 to disconnect the circuit. The overcharge protection unit 32 uses a DS3231 clock chip to realize timed power-off control of the branch relay 223 on the branch circuit 22.

[0035] The overcharge protection unit 32 has a power-off time error of ≤ ±2 minutes / year. The timing control logic of the overcharge protection unit 32 includes: Lithium battery charging mode: 3-stage charging (constant current → constant voltage → trickle charging), total duration T1 = battery capacity (C) / charging current (I) × 1.2 Lead-acid battery charging mode: automatic compensation of float charge voltage, compensation coefficient K = 1 + (T_amb-25) × 0.003.

[0036] The temperature protection unit 33 includes a surface-mount NTC thermistor (accuracy ±1℃) and an infrared temperature sensor, which are connected in parallel with the main circuit breaker 21 and the branch relay (223).

[0037] The charging status judgment unit 34 is configured to: collect the charging current I(t) and battery terminal voltage V(t) in real time, and determine that the battery is fully charged and trigger the tripping of the main circuit breaker 21 when the following conditions are met simultaneously:

[0038] (i) The current drop rate ΔI / Δt ≥ 5% / min, and lasts for 3 minutes;

[0039] (ii) Voltage fluctuation ΔV ≤ ±0.5%, lasting for 5 minutes;

[0040] (iii) The battery temperature gradient dT / dt ≤ 0.2℃ / min, the trip response time ≤ 50ms, and an encrypted log is generated and uploaded to the cloud after tripping.

[0041] Both the upper surface of the partition 11 forming the charging layer 13 and the upper surface of the cabinet 61 are provided with flame-retardant pads 4. The flame-retardant pads 4 are V-0 flame-retardant with an IP67 protection rating. The flame-retardant pads 4 have a three-layer composite structure, including: upper layer: ceramic fiber cloth (thickness 0.5mm, thermal conductivity ≤0.05W / m·K); middle layer: mica board (thickness 1.2mm, breakdown voltage ≥6kV); lower layer: silicone rubber pad (hardness 60±5Shore A). The lower silicone rubber pad rests on the partition 11.

[0042] The back plate 15 is equipped with a heat dissipation device 7. The heat dissipation device 7 consists of four fans with a wind speed of ≥2m / s.

[0043] The storage cabinet 6 is located at the bottom of the cabinet 1. The storage cabinet 6 includes a cabinet body 61 integrally connected to the cabinet 1, a cabinet door 62 connected to the cabinet body 61 via hinges, and a door lock 63 mounted on the cabinet door 62. The door lock 63 is an integrated electromagnetic lock. Spare equipment or tools are stored in the storage cabinet 6.

[0044] This invention effectively improves the battery charging efficiency of instruments and equipment, and reduces safety hazards caused by overcharging, overvoltage, and leakage. It implements a single-circuit, single-charge air switch with overvoltage and leakage protection functions (automatically shutting off the main power switch when the power cable or air switch overheats). The battery then passes through a time-delay, timed overcharge voltage stabilization protection module to the power socket, achieving a stable single-circuit, single-charge environment.

[0045] This utility model features a coupled design of electrical protection (overvoltage / overcurrent / leakage) and physical protection (flame retardant / heat insulation / moisture-proof) with three-level time-sequence control: real-time monitoring → threshold judgment → graded action (power reduction → alarm → power cut-off). It solves problems such as chaotic charging, multiple charging on a single line, heat dissipation defects, and lack of graded protection mechanisms, integrating various charging protection functions.

[0046] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A centralized charging protection device, comprising a cabinet (1), wherein the cabinet (1) is formed by partitions (11) having an equipment layer (12) and a plurality of charging layers (13), characterized in that, It also includes a storage cabinet (6) located at the bottom of the cabinet (1) and a heat dissipation device (7) located at the back of the cabinet (1), the heat dissipation device (7) being connected to the charging layer (13); The locker (6) includes a cabinet body (61) connected to the cabinet (1), a cabinet door (62) connected to the cabinet body (61) via a hinge, and a door lock (63) provided on the cabinet door (62).

2. The centralized charging protection device according to claim 1, characterized in that, The equipment layer (12) is provided with a hierarchical power distribution module (2), which includes a main circuit breaker (21) and multiple branch circuits (22) connected in parallel with the main circuit breaker (21); each charging layer (13) is provided with multiple power sockets (5), and the multiple branch circuits (22) are connected to the power sockets (5) one by one; an input cable (8) is connected to the main circuit breaker (21).

3. The centralized charging protection device according to claim 2, characterized in that, Each branch circuit (22) is provided with an air switch (221) for switching the branch circuit (22) on and off, and / or each branch circuit (22) is provided with a current transformer (222) for switching the branch circuit (22) on and off.

4. The centralized charging protection device according to claim 3, characterized in that, When the current transformer (222) of a certain branch circuit (22) is disconnected, the three branch circuits (22) adjacent to that branch circuit (22) are all disconnected.

5. The centralized charging protection device according to claim 2, characterized in that, The equipment layer (12) is also provided with a multi-level protection control module (3), which is electrically connected to the hierarchical power distribution module (2).

6. The centralized charging protection device according to claim 5, characterized in that, The multi-level protection control module (3) includes an overvoltage protection unit (31) for monitoring the charging voltage, and / or the multi-level protection control module (3) also includes an overcharge protection unit (32) for timed power-off control via a clock chip, and / or the multi-level protection control module (3) also includes a temperature protection unit (33) for power-off control via temperature monitoring.

7. The centralized charging protection device according to claim 5 or 6, characterized in that, The multi-level protection control module (3) also includes a charging status judgment unit (34) electrically connected to the main circuit breaker (21).

8. The centralized charging protection device according to claim 2, characterized in that, The power distribution structure of the branch circuit (22) is as follows: the maximum load current of a single circuit is ≤16A, the line impedance is ≤0.1Ω, and the distance between adjacent circuits is ≥15mm.

9. The centralized charging protection device according to any one of claims 1-6, characterized in that, The upper surfaces of the partition (11) and the storage cabinet (6) are provided with flame-retardant pads (4). The flame-retardant pads (4) include silicone rubber pads, mica boards and ceramic fiber cloth stacked from bottom to top. The silicone rubber pads are connected to the partition (11).

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