Direct current mobile explosion-proof lithium battery device

Abstract

The application relates to a DC mobile explosion-proof lithium battery device in the technical field of explosion-proof electric and energy storage power supply, which comprises a whole explosion-proof shell assembly, a lithium battery core group and a battery management module. The shell assembly comprises a battery cavity, a terminal cavity and an end cover. The lithium battery core group is fixed in the battery cavity. The top end of the battery cavity is provided with a battery cavity cover. The terminal cavity is fixed at the top end of the battery cavity cover. A first explosion-proof terminal block is arranged on the battery cavity cover. The end cover covers the top end of the terminal cavity. The two sides of the terminal cavity are respectively provided with a power output explosion-proof interface and a communication output explosion-proof interface. A second explosion-proof terminal block is arranged in the terminal cavity. The lithium battery group, the management circuit and the explosion-proof shell are integrally designed, the problem of the traditional scheme being heavy and complex is solved, and a safe, compact, plug-and-play mobile explosion-proof power supply core module is provided.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof electrical and energy storage power technology, and in particular to an integrated DC mobile explosion-proof lithium battery device that can be directly applied to explosive hazardous environments. Background Technology

[0002] In locations where explosive gases are present, such as petrochemical plants, coal mines, and emergency rescue facilities, the application of DC explosion-proof valve actuators, portable electronic devices, testing instruments, small tools, and emergency lighting systems is becoming increasingly widespread. These devices typically require DC power, and lithium batteries are the preferred choice due to their high energy density and long cycle life.

[0003] However, ordinary lithium battery packs pose risks of thermal runaway, fire, and even explosion under conditions of overcharging, over-discharging, short circuits, or mechanical abuse. They are themselves potential ignition sources and should never be used directly in hazardous locations. Current practices involve placing ordinary lithium batteries in an external, bulky explosion-proof enclosure, or using a secondary conversion method of "explosion-proof enclosure + intrinsically safe power supply." The former results in a bulky system, low energy density, and inconvenience; the latter is complex, costly, and inefficient. Therefore, there is an urgent need for an integrated, modular mobile power supply device that deeply integrates lithium batteries with an explosion-proof protection structure, making it a complete explosion-proof unit in itself. Utility Model Content

[0004] The purpose of this application is to provide a DC mobile explosion-proof lithium battery device. By integrating the lithium battery pack, management circuit and explosion-proof housing into a single design, the problem of bulky and complex traditional solutions is solved, and a safe, compact and plug-and-play mobile explosion-proof power supply core module is provided.

[0005] To achieve the above objectives, this utility model provides a DC mobile explosion-proof lithium battery device, comprising an explosion-proof housing assembly, a lithium battery cell assembly disposed inside the housing assembly, and a battery management module disposed on the lithium battery cell assembly. The housing assembly includes a battery cavity, a terminal cavity, and an end cover. The lithium battery cell assembly is fixed in the battery cavity, and the top of the battery cavity has a battery cavity cover. The terminal cavity is fixed to the top of the battery cavity cover. The battery cavity cover is provided with a first explosion-proof terminal block that can connect the inner cavity of the battery cavity and the inner cavity of the terminal cavity. The end cover is closed on the top of the terminal cavity. Explosion-proof output interfaces are respectively provided on both sides of the terminal cavity. The terminal cavity is provided with a second explosion-proof terminal block that can divide the terminal cavity into two chambers.

[0006] To facilitate the assembly and disassembly of the lithium battery cell assembly and ensure its stability, the lithium battery cell assembly includes a support plate, a battery insulating plate, a lithium battery pack, a pressure plate, and pull rods. The battery insulating plate is located at the top of the support plate, the lithium battery pack is located at the top of the battery insulating plate, and the pressure plate is located at the top of the lithium battery pack. The pressure plate and the support plate are fixed together by several pull rods.

[0007] To ensure insulation, the lithium battery pack has multiple layers, with adjacent layers separated by insulating modules.

[0008] To facilitate the connection between the battery management module and the circuit board inside the terminal cavity, the battery management module is located on the top of the pressure plate and is correspondingly located below the first explosion-proof terminal block.

[0009] To ensure the insulation of the lithium battery cell assembly, the gaps in the internal cavity of the battery are filled with thermally conductive potting compound.

[0010] To facilitate power-on and power-off of the device, a DC air switch is fixed at the bottom of the battery compartment cover, and a handle connected to the DC air switch is provided at the top of the battery compartment cover.

[0011] To facilitate the overall assembly and disassembly of the terminal cavity, the outer wall of the top of the battery cavity has a flange, and the battery cavity cover is detachably connected to the flange by several screws.

[0012] To facilitate the assembly and disassembly of the terminal cavity, the terminal cavity includes an upper cavity and a lower cavity. The lower cavity is welded to the top of the battery cavity cover, and the upper cavity is detachably fixed to the top of the lower cavity.

[0013] To facilitate the assembly and disassembly of the second explosion-proof terminal block, the explosion-proof power output interface, and the explosion-proof communication output interface, the second explosion-proof terminal block is located in the upper cavity, and the explosion-proof output interfaces are located on both sides of the upper cavity.

[0014] Compared with existing technologies, this design has the following advantages: (1) Deep integration of intrinsic safety and structural safety: The lithium battery, a source of danger, is permanently encapsulated through an explosion-proof structure, making the entire lithium battery device itself an independent explosion-proof component that can be used in Zone 1 and Zone 2 hazardous locations without additional protection; (2) Modularization and standardization: As a standard and replaceable power module, the device can easily supply power to a variety of explosion-proof equipment, realizing the universality and standardization of power supply and simplifying equipment design; (3) High protection and high reliability: The internal potting compound not only plays a role in heat conduction, but also provides excellent shock resistance, moisture resistance and corrosion resistance, which greatly improves the reliability of the device in harsh industrial environments. (4) High-efficiency thermal management: Combining internal potting compound conduction and shell convection heat dissipation, a high-efficiency thermal management system is formed, which effectively controls the temperature rise of the cell during operation, extends battery life and improves safety. (5) Information integration: Through integrated communication functions, users can monitor the battery health status in real time, realizing intelligent power management. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the DC mobile explosion-proof lithium battery device of this utility model. Detailed Implementation

[0016] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of the present invention.

[0017] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "side", "end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] like Figure 1 The DC mobile explosion-proof lithium battery device shown includes an explosion-proof housing assembly, a lithium battery cell assembly disposed inside the housing assembly, and a battery management module 3 disposed on the lithium battery cell assembly. Specifically, the housing assembly is made of magnesium-free aluminum alloy or antistatic reinforced engineering plastic. The housing assembly includes a battery cavity 1, a terminal cavity, and an end cover 18. The lithium battery cell is fixed inside the battery cavity 1. The top of the battery cavity 1 has a battery cavity cover 10. The outer wall of the top of the battery cavity 1 has a flange. The battery cavity cover 10 is detachably connected to the flange by several screws 11. A sealing ring is provided on the mating surface between the battery cavity cover 10 and the battery cavity 1 to ensure the sealing of the battery cavity 1. A first explosion-proof terminal block 15 is provided on the battery cavity cover 10 to connect the inner cavity of the battery cavity 1 and the inner cavity of the terminal cavity, which is used to realize wiring between the battery cavity 1 and the terminal cavity. A DC air switch 12 is fixed at the bottom of the battery cavity cover 10. A handle 13 connected to the DC air switch 12 is provided at the top of the battery cavity cover 10. The DC air switch 12 can be opened and closed by the handle 13, thereby realizing the power supply and power cut-off of the device. In addition, a metal handle 14 is provided at the top of the battery cavity cover 10 for easy carrying and to ensure insulation safety. Specifically, the lithium battery cell assembly is a lithium iron phosphate cell or a ternary lithium cell, arranged in series, parallel, or a combination of series and parallel. It includes a support plate 4, a battery insulating plate 5, a lithium battery pack 2, a pressure plate 8, and pull rods 6. The battery insulating plate 5 is located at the top of the support plate 4, and the lithium battery pack 2 is located at the top of the battery insulating plate 5. The lithium battery pack 2 has two layers, with adjacent layers separated by an insulating module 7. The pressure plate 8 is located at the top of the lithium battery pack 2, and is fixed to the support plate 4 by several pull rods 6. Module 3 is located at the top of the pressure plate 8, and the battery management module 8 is located below the first explosion-proof terminal block 15. The battery management module 3 is electrically connected to the lithium battery pack 2. The battery management module 3 has charge and discharge management, power metering, temperature protection and communication functions. The gap between the battery cavity 1 and the lithium battery core is filled with thermally conductive potting compound 9. The thermally conductive potting compound 9 encapsulates the lithium battery pack 2 and the battery management module 3. Through this structure, the lithium battery core is integrated into a single structure, stably placed in the inner cavity of the battery cavity 1, and its insulation is guaranteed. Specifically, the terminal cavity includes an upper cavity 17 and a lower cavity 16. The lower cavity 16 is welded to the top of the battery cavity cover 10. Electronic components such as circuit boards can be installed inside the lower cavity 16, and it is electrically connected to the battery management module 3 through the first explosion-proof terminal block 15. The upper cavity 17 is detachably fixed to the top of the lower cavity 16 by screws, and a sealing ring is provided on the joint surface between the upper cavity 17 and the lower cavity 16. A second explosion-proof terminal block 19 is provided inside the upper cavity 17. Explosion-proof output interfaces are respectively provided on both sides of the upper cavity 17. Power output terminal 21 and communication output terminal 20 are respectively provided in the two explosion-proof output interfaces. The power output terminal 21 and communication output terminal 20 are explosion-proof multi-core aviation plugs. The power output terminal 21 and communication output terminal 20 are electrically connected to the battery management module 3. The end cap 18 is fitted onto the top of the upper cavity 17. The end cap 18 is detachably connected to the upper cavity 17 by screws, and a sealing ring is provided on the mating surface between the end cap 18 and the upper cavity 17.

[0019] This utility model discloses a DC mobile explosion-proof lithium battery device. The upper cavity 17, lower cavity 16, and end cap 18 are fastened with bolts through a precision-machined flat explosion-proof joint surface. The gap width and surface roughness meet the explosion-proof requirements of Ex db IIC T6 Gb. The internal core is a lithium battery cell assembly, which in this example uses four lithium iron phosphate cells (nominal voltage 12.8V) arranged in two parallel and two series configurations. Above the lithium battery cell assembly, a battery management module 3 is fixed. This module has overcharge, over-discharge, overcurrent, short circuit, and temperature protection functions, and integrates the MODBus communication protocol. Both the lithium battery cell assembly and the battery management module 3 are completely wrapped and fixed by a high thermal conductivity epoxy resin thermally conductive potting compound 9, forming a robust whole and ensuring efficient heat transfer to the casing. Two explosion-proof input devices are installed on the upper cavity 17 as explosion-proof output interfaces. Two high-current pins serve as power output terminals 21 (positive and negative), and the other two pins serve as communication output terminals 20, connected to the communication port of the battery management module 3, for reporting battery voltage, current, remaining power, and fault information to the host device. This device, as an independent explosion-proof power supply module, can directly power explosion-proof electrical terminals, detectors, headlamps, and other equipment that meet the specified voltage levels, and achieves intelligent management through the communication interface. Its overall design meets multiple requirements for explosion-proof, protective, heat dissipation, and mechanical strength, making it a safe and reliable mobile energy solution.

[0020] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape, principle and application direction of this application should be covered within the scope of protection of this application.

Claims

1. A DC mobile explosion-proof lithium battery device, comprising an explosion-proof housing assembly, a lithium battery cell assembly disposed inside the housing assembly, and a battery management module disposed on the lithium battery cell assembly, characterized in that: The housing assembly includes a battery cavity, a terminal cavity, and an end cap. The lithium battery cell is fixed in the battery cavity. The top of the battery cavity has a battery cavity cap. The terminal cavity is fixed to the top of the battery cavity cap. The battery cavity cap is provided with a first explosion-proof terminal block that can connect the inner cavity of the battery cavity and the inner cavity of the terminal cavity. The end cap is closed on the top of the terminal cavity. Explosion-proof output interfaces are respectively provided on both sides of the terminal cavity. The terminal cavity is provided with a second explosion-proof terminal block that can divide the terminal cavity into two chambers.

2. The DC mobile explosion-proof lithium battery device according to claim 1, characterized in that: The lithium battery core assembly includes a support plate, a battery insulating plate, a lithium battery pack, a pressure plate, and pull rods. The battery insulating plate is disposed on the top of the support plate, the lithium battery pack is disposed on the top of the battery insulating plate, and the pressure plate is disposed on the top of the lithium battery pack. The pressure plate and the support plate are fixed together by several pull rods.

3. The DC mobile explosion-proof lithium battery device according to claim 2, characterized in that: The lithium battery pack has multiple layers, with adjacent layers separated by an insulating module.

4. The DC mobile explosion-proof lithium battery device according to claim 2, characterized in that: The battery management module is located on the top of the pressure plate, and is correspondingly located below the first explosion-proof terminal block.

5. The DC mobile explosion-proof lithium battery device according to claim 2, characterized in that: The gaps in the inner cavity of the battery are filled with thermally conductive potting compound.

6. The DC mobile explosion-proof lithium battery device according to claim 1, characterized in that: A DC air switch is fixed at the bottom of the battery compartment cover, and a handle connected to the DC air switch is provided at the top of the battery compartment cover.

7. The DC mobile explosion-proof lithium battery device according to claim 1, characterized in that: The battery cavity has a flange on the top outer wall, and the battery cavity cover is detachably connected to the flange by several screws.

8. The DC mobile explosion-proof lithium battery device according to claim 1, characterized in that: The terminal cavity includes an upper cavity and a lower cavity. The lower cavity is welded to the top of the battery cavity cover, and the upper cavity is detachably fixed to the top of the lower cavity.

9. The DC mobile explosion-proof lithium battery device according to claim 8, characterized in that: The second explosion-proof junction box is located in the upper cavity, and the explosion-proof output interface is located on both sides of the upper cavity.

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