Battery explosion-proof box

Abstract

This invention provides an explosion-proof battery enclosure, comprising an explosion-proof enclosure body, a roller guide module, an explosion-proof grounding module, an explosion-proof wiring module, and a battery pack. The battery pack and roller guide module are both installed inside the explosion-proof enclosure body. The roller guide module is located at the bottom of the battery pack, converting the sliding friction during battery pack assembly and disassembly into rolling friction. The explosion-proof grounding module is connected to the battery pack, with at least a portion of it penetrating the enclosure body and exposed on the outside, conducting static electricity generated during battery pack operation to the ground. The explosion-proof wiring module is also connected to the battery pack, with at least a portion exposed on the outside, safely connecting the battery pack to the fire truck power supply system. Thus, these components are connected to the enclosure body using explosion-proof technology, ensuring overall explosion-proof performance while facilitating individual module maintenance. The entire enclosure meets the EXdIIBT4 explosion-proof rating, fully achieving the required explosion-proof performance, and can be safely used in environments with volatile gasoline and diesel gases, completely eliminating the explosion hazard of traditional battery boxes.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically, to a battery explosion-proof box. Background Technology

[0002] Fire trucks, as core equipment for emergency rescue, need to operate continuously for extended periods. Their power systems are typically equipped with multiple high-capacity batteries to ensure continuous power supply to the chassis, lighting, and communication systems. However, existing fire truck battery boxes have the following characteristics:

[0003] Poor ease of loading and unloading: Traditional battery boxes use a "fixed tray + bolt fastening" structure. Multiple battery packs are heavy, and loading and unloading require 2-3 people to cooperate in the handling. This is not only inefficient (each loading and unloading takes ≥30 minutes), but also prone to mechanical sparks due to battery collisions during handling, posing a safety hazard.

[0004] Insufficient explosion-proof performance: Gasoline and diesel volatile gases or dust are often present at fire-fighting sites (such as chemical fire sites). Ordinary battery boxes do not have professional explosion-proof design. The gap between the box joint surfaces is too large (>0.5mm), which can easily lead to the infiltration of flammable gases. The wiring is not explosion-proof and can easily generate sparks. Static electricity cannot be effectively discharged, which can easily cause explosion accidents.

[0005] Poor compatibility with multiple batteries: Existing explosion-proof boxes are mostly designed for small single-cell batteries and lack partitioned fixing structures. Stacking multiple batteries can easily cause collisions due to vehicle vibrations, which can not only damage the batteries but also generate sparks due to friction. Furthermore, it is difficult to balance explosion-proof structure with ease of loading and unloading. Some explosion-proof boxes use "fully enclosed welding" to ensure sealing, which further increases the difficulty of battery maintenance.

[0006] Insufficient structural durability: Traditional steel plate battery boxes have poor corrosion resistance (firefighting sites are often exposed to water and chemicals), have a service life of only 3-5 years, and are heavy (increasing the load on fire trucks); while lightweight plastic boxes are lightweight, but lack strength and cannot meet the explosion-proof pressure bearing requirements (must withstand an internal explosion pressure of ≥0.8MPa).

[0007] To address the aforementioned issues, there is an urgent need to develop a dedicated explosion-proof battery box for fire trucks that combines explosion-proof safety, ease of loading and unloading, and compatibility with multiple batteries, in order to improve the safety of firefighting operations and the efficiency of battery maintenance. Summary of the Invention

[0008] In view of this, the present invention aims to provide a battery explosion-proof box for use on fire trucks, in order to solve the technical problems of existing fire truck battery boxes being difficult to load and unload due to the large number and weight of batteries, and insufficient explosion-proof performance in fire-fighting operation scenarios.

[0009] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0010] A battery explosion-proof box, comprising:

[0011] Explosion-proof enclosure, forming the outer shell of the battery explosion-proof box;

[0012] The battery pack is located inside the explosion-proof enclosure;

[0013] A roller guide module is installed inside the explosion-proof enclosure and is located at the bottom of the battery pack to convert the sliding friction of battery pack assembly and disassembly into rolling friction.

[0014] The explosion-proof grounding module, as an electrostatic control unit, is connected to the battery pack. At least part of the explosion-proof grounding module passes through the explosion-proof enclosure and is exposed on the outside of the explosion-proof enclosure. The explosion-proof grounding module conducts the static electricity generated by the battery pack during operation to the ground through the grounding wire.

[0015] The explosion-proof wiring module, as a safe power supply unit, is also connected to the battery pack. At least part of the explosion-proof wiring module passes through the explosion-proof enclosure and is exposed on the outside of the enclosure, safely connecting the battery pack to the fire truck's power supply system.

[0016] In some embodiments, the explosion-proof enclosure includes an enclosure body and a cover plate, which are connected by standard parts, and the mating surfaces of the enclosure body and the cover plate are provided with explosion-proof features.

[0017] In some embodiments, a sealing ring is provided on the explosion-proof joint surface between the enclosure and the cover to isolate the flammable and explosive environment inside and outside the enclosure.

[0018] In some embodiments, the enclosure is made of cast aluminum, the cover is an explosion-proof cover, the wall thickness of the enclosure is ≥5mm, and the wall thickness of the top cover is ≥6mm.

[0019] In some embodiments, the roller guide module serves as a convenient loading and unloading unit for guiding the movement of the battery pack. It includes a roller frame, a roller assembly, and a guide rail. The roller frame is fixed to the bottom of the housing, the roller assembly is mounted on the roller frame, and the guide rail is located inside the roller frame. Correspondingly, a groove is provided at the bottom of the battery pack, and the guide rail is in clearance fit with the groove at the bottom of the battery pack.

[0020] In some embodiments, the roller frames are configured as multiple sets, which are arranged in parallel. Each set of roller frames is equipped with multiple rollers, and the multiple rollers are arranged in a row on the corresponding roller frame.

[0021] In some embodiments, each set of roller frames is equipped with multiple rollers, the surface of which is coated with oil-resistant rubber.

[0022] In some embodiments, the explosion-proof grounding module includes a grounding terminal and a sealing gasket, wherein the grounding terminal passes through the enclosure and is partially exposed on the outside of the enclosure, and the grounding wire is connected to the grounding terminal.

[0023] In some embodiments, the explosion-proof wiring module includes an explosion-proof connector partially exposed on the outside of the enclosure. The explosion-proof connector is connected to the battery inside the enclosure, and the portion of the explosion-proof connector exposed on the outside of the enclosure is securely connected to the fire truck power supply system via a connecting wire.

[0024] In some embodiments, the explosion-proof connector includes a terminal block, a conduit sleeve, and a sealing ring. The terminal block is installed in an explosion-proof opening on the side wall of the enclosure, and a sealing ring is sandwiched between the opening and the terminal block. The conduit sleeve is welded to the outside of the opening, and the battery pack power supply lead passes through the conduit sleeve and connects to the terminal block. The terminal block is then safely connected to the fire truck power supply system via a connecting wire.

[0025] Compared to existing technologies, the battery explosion-proof box described in this invention solves the problems of "compatibility between explosion-proof performance and convenience" and "synergy between multiple battery fixing and safety control," specifically in the following aspects:

[0026] The precision design of the explosion-proof joint surface between the enclosure and the cover: through cast aluminum material + wire thread insert + precision machining (gap ≤ 0.1mm), the sealing and explosion-proof performance of the joint surface is guaranteed (meeting EXdIIBT4), and the addition of wire thread insert enhances the wear resistance of the threads, solving the problem of thread stripping caused by repeated disassembly of traditional bolts; in addition, the structure is highly durable, the cast aluminum enclosure is corrosion resistant and impact resistant, and the service life can reach more than 8 years (3-5 years for traditional steel plate enclosures).

[0027] Roller-guided and explosion-proof compatible design: The roller guide assembly is bolted and parallel load-bearing rollers facilitate the easy entry and exit of the battery pack. The explosion-proof enclosure has explosion-proof joints and connecting joints to enhance sealing and explosion-proof performance, balancing convenience and safety. The size is compatible with the battery compartments of mainstream fire trucks. The M8 grounding terminal and explosion-proof design meet the electrical standards of fire trucks. It can be installed without modifying the fire truck, resulting in low application costs.

[0028] Modular integrated process: Each module is connected to the enclosure through explosion-proof technology (no welded closed structure), which not only ensures the overall explosion-proof performance, but also facilitates the maintenance of individual modules (such as the rollers can be replaced individually when damaged, without disassembling the entire enclosure); "grounding-wiring-fixing" triple spark prevention, static electricity elimination efficiency ≥99%, no risk of mechanical sparks or wiring sparks, adaptable to complex and dangerous environments in fire fighting operations, and safety control without blind spots. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the external structure of the battery explosion-proof box according to an embodiment of the present invention;

[0030] Figure 2 This is a top view of the internal structure of the battery explosion-proof box according to an embodiment of the present invention;

[0031] Figure 3 This is a side view of the internal structure of the battery explosion-proof box according to an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Box body, 2-Cover plate, 3-Grounding terminal, 4-Explosion-proof connector, 5-Roller assembly, 6-Battery, 7-Battery separator, 8-Sealing ring, 9-Roller frame. Detailed Implementation

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] like Figures 1-3 As shown, the battery explosion-proof box includes an explosion-proof enclosure, a roller guide module, an explosion-proof grounding module, an explosion-proof wiring module, and a battery pack. The battery pack and roller guide module are both installed inside the explosion-proof enclosure, with the roller guide module positioned at the bottom of the battery pack. This roller guide module converts the sliding friction (traditional) during battery pack assembly and disassembly into rolling friction, reducing impact damage during battery handling. The explosion-proof grounding module, serving as an electrostatic discharge (ESD) control unit, is connected to the battery pack. At least a portion of the explosion-proof grounding module passes through the explosion-proof enclosure and is exposed on the outside. The explosion-proof grounding module conducts static electricity generated during battery pack operation to the ground via a grounding wire. The explosion-proof wiring module, serving as a safe power supply unit, is also connected to the battery pack. At least a portion of the explosion-proof wiring module passes through the explosion-proof enclosure and is exposed on the outside, safely connecting the battery pack to the fire truck's power supply system. Therefore, the explosion-proof grounding module, explosion-proof wiring module, and battery pack are all connected to the enclosure through explosion-proof technology (without welded closed structure), which not only ensures the overall explosion-proof performance but also facilitates the maintenance of individual modules. The whole system meets the EXdIIBT4 explosion-proof rating and has passed the GB3836.2-2021 explosion-proof test (no explosion propagation when ignited internally). It can be used safely in environments with gasoline and diesel volatile gases, completely solving the explosion hazard of traditional battery boxes and achieving full compliance with explosion-proof performance standards.

[0036] The explosion-proof enclosure includes a housing 1 and a cover plate 2, which are connected by standard parts. The mating surfaces of the housing 1 and the cover plate 2 are designed to be explosion-proof, and a sealing ring 8 is provided on the explosion-proof joint surface between them to isolate the flammable and explosive environment inside and outside the enclosure and protect the battery from external impact.

[0037] Specifically, the enclosure 1 is made of cast aluminum, and the cover plate 2 is an explosion-proof cover plate. The explosion-proof enclosure composed of enclosure 1 and cover plate 2 serves as the installation base for all modules, bears the weight of multiple battery groups, isolates the flammable and explosive environment inside and outside the enclosure, withstands the 0.8 MPa explosion pressure that may be generated inside, prevents flame propagation, and protects the batteries from external impacts (such as collisions during firefighting operations).

[0038] Furthermore, the housing 1 and the cover plate 2 are connected by explosion-proof bolts (with anti-loosening washers), and the bolt tightening torque is controlled at 35-40 N.m to ensure that the gap is ≤0.1mm.

[0039] In this embodiment, the cast aluminum has a tensile strength ≥220 MPa, better corrosion resistance than steel plate, and is 40% lighter than steel plate. The wall thickness of the enclosure 1 is ≥5 mm, the wall thickness of the top cover 2 is ≥6 mm, the width of the explosion-proof joint surface between the enclosure 1 and the cover 2 is ≥25 mm, and the surface roughness of the explosion-proof joint surface is Ra1.6. The gap between the explosion-proof joint surfaces must be precisely controlled to ≤0.1 mm to prevent gas leakage.

[0040] The roller guide module, serving as a convenient loading and unloading unit for guiding battery pack movement, includes a roller frame 9, a roller assembly 5, and a guide rail. The roller frame 9 is fixed to the bottom of the housing, the roller assembly 5 is mounted on the roller frame 9, and the guide rail is located inside the roller frame 9. Correspondingly, a sliding groove is provided at the bottom of the battery pack, and the guide rail is fitted with the sliding groove at the bottom of the battery pack with a clearance fit. Thus, when moving the battery pack inward or outward, the sliding friction (traditional) of battery pack loading and unloading is converted into rolling friction, reducing the frictional force from ≥500N to ≤50N. This ensures that a single person can push a 150kg battery pack, facilitating the loading, unloading, and replacement of the battery pack. At the same time, the guide rail restricts the displacement of the battery pack, preventing mechanical sparks from colliding with the inner wall of the housing during loading and unloading. The roller guide assembly reduces the frictional force of battery pack loading and unloading by 80%, allowing a single person to complete the loading and unloading of a 150kg battery pack, reducing the time from 30 minutes to less than 10 minutes, reducing the labor intensity of firefighters, and improving emergency maintenance efficiency.

[0041] In this embodiment, multiple sets of roller frames 9 are arranged in parallel, with each set of roller frames equipped with multiple rollers. These rollers are arranged in a row on the corresponding roller frame 9. Preferably, two or three sets of roller frames 9 are arranged in parallel at the bottom of the housing 1. When there are two sets, they are located near the sides of the bottom of the housing. When there are three sets, the three sets of roller frames 9 are located near the center and sides of the bottom of the housing 1, respectively, providing stable support for the movement of the battery pack and preventing local tilting of the battery pack.

[0042] Furthermore, the roller frame is fixed to the bottom of the explosion-proof enclosure with M8 explosion-proof bolts (with anti-loosening washers), and the guide rail is welded to the inside of the roller frame to prevent the roller frame and guide rail from becoming loose. The surface of the rollers is covered with a rubber layer to reduce impact damage during battery handling and also to provide shock absorption.

[0043] As one embodiment of the present invention, each set of roller frames is equipped with 6 stainless steel bearing load-bearing rollers, and the surface of the rollers is covered with 4-6mm thick oil-resistant nitrile rubber. The rated load of a single roller is ≥50kg (suitable for a total battery weight of 150kg).

[0044] The battery pack includes multiple batteries 6 and battery separators 7. The batteries 6 are mounted on a tray, and the battery separators 7 are located at the edge of the tray to limit the batteries. Multiple independent mounting chambers can accommodate multiple battery packs, meeting the power supply needs of different fire trucks without changing the enclosure, demonstrating strong versatility.

[0045] In this embodiment, the explosion-proof grounding module includes a grounding terminal 3 and a sealing gasket. The grounding terminal 3 passes through the enclosure and is partially exposed on the outside of the enclosure. The grounding wire is connected to the grounding terminal. Furthermore, the grounding terminal 3 is welded to the outside of the explosion-proof enclosure near the lower part, so that the static electricity generated during the operation of the battery pack (the static voltage can reach 1000V during battery charging and discharging) is conducted to the ground through the grounding wire, with a static electricity elimination efficiency of ≥99%.

[0046] An explosion-proof sealing gasket is installed between grounding terminal 3 and enclosure 1. The gasket is a 5mm fluororubber explosion-proof gasket. The gasket and joint prevent flammable gases from seeping into the terminal gap and avoid electrostatic sparks igniting external gases. Furthermore, grounding terminal 3 is an M8 external thread grounding terminal with a grounding resistance ≤4Ω.

[0047] The explosion-proof wiring module includes an explosion-proof connector 4 partially exposed on the outside of the enclosure. The explosion-proof connector 4 connects to the battery inside the enclosure, and the exposed portion of the connector 4 is securely connected to the fire truck's power supply system via a connecting wire. Specifically, the explosion-proof connector 4 includes a terminal block, a conduit sleeve, and a sealing ring. The terminal block is installed within an explosion-proof opening on the side wall of the enclosure, with a sealing ring sandwiched between the opening and the terminal block. The conduit sleeve is welded to the outside of the opening. The battery pack power supply lead passes through the conduit sleeve and connects to the terminal block. The terminal block is then securely connected to the fire truck's power supply system via a connecting wire. This ensures a safe connection between the battery pack and the fire truck's power supply system, preventing electrical sparks (such as those from poor contact) generated at the wiring point from igniting external flammable gases. The insulation resistance at the wiring point is ≥100MΩ.

[0048] Furthermore, the conduit is made of stainless steel explosion-proof conduit, with a flame-retardant insulating layer wrapped around its inner wall. This flame-retardant insulating layer prevents short circuits in the leads, and the sealing ring prevents gas leakage, ensuring the explosion-proof performance of the wiring components. Preferably, the sealing ring is made of copper to ensure normal conductivity of the terminals.

[0049] The battery explosion-proof box of this invention includes an explosion-proof box body made of cast aluminum, an internal roller guide assembly, an external M8 explosion-proof grounding terminal, a partitioned battery fixing module, and an explosion-proof wiring module; the explosion-proof joint surface and connecting joint of the explosion-proof box body enhance the sealing and explosion-proof performance; the roller guide assembly enables convenient entry and exit of battery packs through parallel load-bearing rollers; the partitioned fixing module prevents sparks from battery shaking; the whole box meets the EXdIIBT4 explosion-proof rating, is suitable for the loading, unloading and fixing of multiple battery packs, and can be operated by a single person, making it suitable for complex flammable and explosive environments in fire fighting operations.

[0050] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A battery explosion-proof box, characterized in that, include: Explosion-proof enclosure, forming the outer shell of the battery explosion-proof box; The battery pack is located inside the explosion-proof enclosure; A roller guide module is installed inside the explosion-proof enclosure and is located at the lower part of the battery pack. It is used to convert the sliding friction of the battery pack assembly and disassembly into rolling friction. An explosion-proof grounding module, as an electrostatic discharge control unit, is connected to the battery pack. At least a portion of the explosion-proof grounding module passes through the explosion-proof enclosure and is exposed on the outside of the enclosure. The explosion-proof grounding module conducts the static electricity generated by the battery pack during operation to the ground through a grounding wire. The explosion-proof wiring module, as a safe power supply unit, is also connected to the battery pack. At least a portion of the explosion-proof wiring module passes through the explosion-proof enclosure and is exposed on the outside of the enclosure, thus safely connecting the battery pack to the fire truck power supply system.

2. The battery explosion-proof box according to claim 1, characterized in that, The explosion-proof enclosure includes an enclosure body and a cover plate, which are connected by standard parts. The mating surfaces of the enclosure body and the cover plate are designed to be explosion-proof.

3. The battery explosion-proof box according to claim 2, characterized in that, A sealing ring is provided at the explosion-proof joint surface between the enclosure and the cover plate to isolate the flammable and explosive environment inside and outside the enclosure.

4. The battery explosion-proof box according to claim 2, characterized in that, The enclosure is made of cast aluminum, the cover is an explosion-proof cover, the wall thickness of the enclosure is ≥5 mm, and the wall thickness of the cover is ≥6 mm.

5. The battery explosion-proof box according to claim 1, characterized in that, The roller guide module, serving as a convenient loading and unloading unit for guiding the movement of the battery pack, includes a roller frame, a roller assembly, and a guide rail. The roller frame is fixed to the bottom of the housing, the roller assembly is mounted on the roller frame, and the guide rail is located inside the roller frame. Correspondingly, a sliding groove is provided at the bottom of the battery pack, and the guide rail is in clearance fit with the sliding groove at the bottom of the battery pack.

6. The battery explosion-proof box according to claim 5, characterized in that, The roller frame is configured as multiple sets, and the multiple sets of roller frames are arranged in parallel. Each set of roller frames is equipped with multiple rollers, and the multiple rollers are installed in a row on the corresponding roller frame.

7. The battery explosion-proof box according to claim 5, characterized in that, Each set of roller frames is equipped with multiple rollers, and the surface of the rollers is covered with oil-resistant rubber.

8. The battery explosion-proof box according to claim 1, characterized in that, The explosion-proof grounding module includes a grounding terminal and a sealing gasket, wherein the grounding terminal passes through the enclosure and is partially exposed on the outside of the enclosure, and the grounding wire is connected to the grounding terminal.

9. The battery explosion-proof box according to claim 1, characterized in that, The explosion-proof wiring module includes an explosion-proof connector partially exposed on the outside of the enclosure. The explosion-proof connector is connected to the battery pack inside the enclosure. The portion of the explosion-proof connector exposed on the outside of the enclosure is securely connected to the fire truck power supply system via a connecting wire.

10. The battery explosion-proof box according to claim 9, characterized in that, The explosion-proof connector includes a terminal block, a conduit sleeve, and a sealing ring. The terminal block is installed in an explosion-proof opening on the side wall of the enclosure. A sealing ring is sandwiched between the opening and the terminal block. The conduit sleeve is welded to the outside of the opening. The battery pack power supply lead passes through the conduit sleeve and connects to the terminal block. The terminal block is then safely connected to the fire truck power supply system via a connecting wire.

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