A positive electrode external safety box

Abstract

This utility model relates to the field of automotive electrical system technology, specifically to a positive external fuse box located in the driver's cab. It includes a box body, copper busbars, and blade fuses. The copper busbars are arranged lengthwise inside the box body, which also contains transversely arranged copper busbars. N openings, where N is an integer ≥ 2, are provided on the copper busbars. N sets of blade fuses are arranged perpendicular to the copper busbars. Each blade fuse has openings at both ends. A single-ended bolt for power input is installed in the opening corresponding to the copper busbar. The power input terminal is directly connected to the power supply from the chassis fuse box using a single wire, and is secured to the copper busbar using a ring terminal and a single-ended bolt. A double-ended bolt is installed in the opening at the end of the blade fuse furthest from the copper busbar. The double-ended bolt has two threaded heads and corresponding nuts. One nut connects to the blade fuse, and the other nut connects to a wiring harness terminal for different purposes via a wire. The overall design improves the safety and stability of the automotive circuit, ensuring the normal operation of the vehicle.

Description

Technical Field

[0001] This utility model relates to the field of automotive electrical system technology, specifically to a positive external fuse box. Background Technology

[0002] In existing automotive electrical systems, the positive power supply is typically introduced into the passenger compartment from the chassis fuse box via two independent wires (such as the chip fuse box power supply and the inverter power supply), and connected to the positive terminal at the firewall. This design has significant drawbacks: First, the large number of wires increases the overall vehicle weight and wiring harness cost; second, the lack of chip fuse protection between the positive terminal and the electrical equipment makes it susceptible to overheating or even vehicle fire in the event of a short circuit; third, traditional chip fuse boxes are located inside the battery box and require waterproofing, leading to increased material costs and structural complexity. Furthermore, the existing solution requires multiple fixings of the wiring harness and terminals during assembly, which is time-consuming.

[0003] To address these issues, there is an urgent need for an integrated, lightweight, and more secure power distribution solution. Utility Model Content

[0004] To address the problems in the existing technology, this utility model provides a positive external fuse box, which solves the problems of redundant wires, high waterproofing costs, and insufficient short-circuit protection in traditional solutions.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A positive electrode external fuse box, located in the driver's cab, specifically includes a box body, a copper busbar, and a blade fuse;

[0007] The copper busbar is arranged inside the box along its length. Inside the box, there is a horizontally arranged copper busbar with N openings, where N is an integer greater than or equal to 2. N sets of chip fuses are arranged perpendicular to the copper busbar. Each chip fuse has openings at both ends. The openings corresponding to the chip fuses and the copper busbar each have a single-ended bolt for power input. The power input terminal is directly connected to the power supply of the fuse box on the chassis using a single wire. After being crimped to the copper busbar using a ring terminal, it is secured with a single-ended bolt. The opening at the end of the chip fuse furthest from the copper busbar has a double-ended bolt with two threaded heads and corresponding nuts. One nut is connected to the chip fuse, and the other nut is connected to a wire harness terminal for different purposes via a wire.

[0008] As a preferred technical solution, the chip fuse is a MIDI-type chip fuse.

[0009] As a preferred technical solution, adjacent sheet fuses inside the box are separated by baffles.

[0010] As a preferred technical solution, the outer wall of the box is provided with a snap-fit ​​structure on opposite sides that cooperates with the inner wall of the firewall bracket.

[0011] As a preferred technical solution, the snap-fit ​​structure includes elastic snap blocks evenly arranged at certain intervals on the outside of the box, and the inner wall of the firewall bracket is provided with a snap groove that cooperates with the elastic snap blocks.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This application relates to a positive external fuse box that can effectively solve the risk of vehicle fire caused by the lack of chip fuse protection after the positive power enters the cab, thereby improving product reliability.

[0014] This external positive fuse box achieves reliable and safe electrical connections through its unique structural design. Its E-shaped electrical connection structure ensures even current distribution, reducing power loss and the risk of overheating. The use of MIDI-type surface mount fuses ensures rapid melting to protect the circuit and effectively prevent vehicle fires. The baffle design on both sides of the surface mount fuses inside the box enhances their protective performance and extends their service life. The snap-fit ​​structure on the outside of the box simplifies installation and maintenance, improving installation efficiency. The overall design fully considers the actual needs of automotive electrical systems, significantly improving circuit safety and stability, and ensuring the normal operation of the vehicle. When powering on, the power supply to the chassis fuse box is reduced from two wires (surface mount fuse box power (after the power switch) + inverter power) to one wire, effectively reducing wiring usage and overall vehicle weight. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a three-dimensional diagram of the positive electrode external fuse box of this utility model;

[0017] Figure 2 for Figure 1 Exploded view;

[0018] Figure 3 This is a structural diagram of the positive electrode external fuse box of this utility model installed on a firewall bracket;

[0019] Figure 4 This is a circuit diagram.

[0020] In the diagram: 1. Box body; 2. Copper busbar; 3. Single-ended bolt; 4. Double-ended bolt; 5. Nut; 6. Plate fuse; 7. Baffle; 8. Firewall bracket; 9. Snap-fit ​​structure. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] Please see Figure 1-4 This embodiment provides a positive external fuse box, located in the driver's cab, specifically including a box body 1, a copper busbar 2, and blade fuses 6. The copper busbar is arranged along the length of the box body inside, and a horizontally arranged three-hole copper busbar 2 is provided inside the box body. Three sets of blade fuses 6 are arranged in a direction perpendicular to the copper busbar. Each blade fuse has an opening at both ends. Each blade fuse and the opening corresponding to the copper busbar is provided with a single-headed bolt 3 for power input. The power input end is directly connected to the power supply of the chassis fuse box using a single wire, and is secured with a single-headed bolt after being crimped to the copper busbar using a ring terminal. A double-headed bolt is provided in the opening at the end of the blade fuse away from the copper busbar. The double-headed bolt has two threaded heads and corresponding nuts. One end of the nut is connected to the blade fuse, and the other end of the nut is connected to the wiring harness terminal for different purposes, such as inverter power supply, parking air conditioner, and driver's cab fuse box, through a wire. The three parallel blade fuses can ensure that when any one circuit is short-circuited, only the corresponding blade fuse blows, without affecting other circuits, effectively solving the risk of vehicle burn caused by the lack of blade fuse protection after current diversion.

[0023] In this embodiment, the positive external fuse box can bring power into the cab through a single wire. The power is evenly distributed through the external fuse box, and the distributed wire is protected by a blade fuse, reducing safety risks and cost waste.

[0024] In other embodiments, the number of openings in the copper busbar 2 and the corresponding number of chip fuses can be increased or decreased, depending on the actual usage requirements.

[0025] Preferably, the chip fuse is a MIDI type chip fuse, which has excellent electrical performance and reliability, and can quickly melt and break in case of abnormal current, effectively protecting the circuit.

[0026] Preferably, each blade fuse box has baffles 7 on both sides; the baffles effectively prevent the blade fuses from being damaged by external mechanical forces during use, and also play a certain role in fire prevention and heat insulation, further improving the safety performance of the blade fuse box and extending its service life.

[0027] Furthermore, the outer wall of the box is provided with snap-fit ​​structures 9 on opposite sides that mate with the inner wall of the firewall bracket 8. This snap-fit ​​structure allows the blade fuse box to be quickly and easily installed on the vehicle's firewall without the need for additional complex fixing devices, improving installation efficiency and facilitating subsequent maintenance and replacement. The entire positive external fuse box design fully considers various operating conditions and needs of the automotive electrical system in actual operation. Through optimized structure and careful material selection, it significantly improves the safety and stability of the vehicle's circuitry while ensuring reliable electrical connections, providing strong protection for the normal operation of the vehicle.

[0028] Furthermore, the snap-fit ​​structure 9 includes elastic snap-fit ​​blocks evenly spaced at a certain interval on the outside of the box body, and the inner wall of the firewall bracket 8 is provided with a slot that cooperates with the elastic snap-fit ​​blocks; during installation, the positive external fuse box is inserted into the firewall bracket 8 along the slot.

[0029] Furthermore, the cable protective sheath material for the positive electrode external fuse box is PA6-GF2O, specifically PA6 with the addition of 20wt% glass fiber. The addition of 20wt% glass fiber significantly improves the tensile strength, impact resistance, and abrasion resistance of PA6, making it suitable for environments subjected to mechanical stress or frequent friction. In addition, PA6-GF2O has better heat resistance than pure PA6, making it suitable for high-temperature environments such as engine compartments and electronic components. It also has a certain resistance to greases, weak acids, and alkalis, making it suitable for chemical exposure environments in industrial or automotive fields. Glass fiber reduces the hygroscopicity of PA6, minimizing performance degradation caused by humidity and protecting internal components from corrosion. PA6 itself is insulating, and this property is retained after the addition of glass fiber, making it suitable for the protection of cables and electrical equipment. PA6-GF2O is lighter than metal, making it suitable for applications requiring weight reduction.

[0030] The core function of this positive external fuse box is power distribution and circuit protection, and its working method is as follows:

[0031] Power is introduced from the chassis fuse box via a single wire, which is then crimped to a ring terminal and fixedly connected to the copper busbar inside the box to ensure stable high-current input. The copper busbar acts as a conductive busbar, distributing power to multiple parallel-connected chip fuses, each corresponding to different electrical devices. The output terminals of each chip fuse are connected via double-ended bolts: the input terminal of the double-ended bolt is secured to the fuse output hole with a nut, and the output terminal is connected to the corresponding load harness (such as the inverter power cord), with the nut tightening the wire terminals. When replacing a fuse, simply remove the double-ended bolt nut of the faulty fuse, replace it with a new fuse, and then tighten it again.

[0032] When a short circuit or overload occurs in a certain circuit, the corresponding chip fuse will quickly blow, cutting off the faulty circuit and preventing abnormal current from affecting other branches, thus preventing the risk of overheating or burning of the wiring harness. The baffle structure prevents the chip fuse from being mechanically damaged, and the snap-fit ​​design makes it easy to fix to the firewall bracket, ensuring that the box is stable and fireproof and heat-insulating.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A positive electrode external fuse box, characterized in that: Located in the driver's cab, it specifically includes a box, copper busbars, and sheet fuses; The copper busbar is arranged inside the box along its length. Inside the box, there is a horizontally arranged copper busbar with N openings, where N is an integer greater than or equal to 2. N sets of chip fuses are arranged perpendicular to the copper busbar. Each chip fuse has openings at both ends. The openings corresponding to the chip fuses and the copper busbar each have a single-ended bolt for power input. The power input terminal is directly connected to the power supply of the fuse box on the chassis using a single wire. After being crimped to the copper busbar using a ring terminal, it is secured with a single-ended bolt. The opening at the end of the chip fuse furthest from the copper busbar has a double-ended bolt with two threaded heads and corresponding nuts. One nut is connected to the chip fuse, and the other nut is connected to a wire harness terminal for different purposes via a wire.

2. The positive electrode external safety box according to claim 1, wherein: The chip insurance is a MIDI type chip insurance.

3. The positive external safety box according to claim 1, wherein: The adjacent sheet fuses inside the box are separated by baffles.

4. The positive external safety box according to claim 1, wherein: The outer wall of the box is provided with snap-fit ​​structures on opposite sides that cooperate with the inner wall of the firewall bracket.

5. The positive electrode external attachment safety box according to claim 4, wherein: The snap-fit ​​structure includes elastic snap blocks evenly spaced at a certain interval on the outside of the box, and the inner wall of the firewall bracket is provided with a snap groove that cooperates with the elastic snap blocks.

Images