Novel grounding structure for bearing large current

Abstract

The utility model discloses a novel grounding structure for bearing large current, which adopts a die-casting aluminum alloy shell assembly, a PCBA (printed circuit board assembly), high-conductivity copper alloy parts and other simple component combinations, and the components are fixed together through inner hexagonal quincunx stainless steel screws. And the grounding current-carrying effect is realized. The structure not only is simple in design, but also is small and exquisite in size, and can well meet strict requirements of small high-power vehicle-mounted products on space. For example, in a vehicle-mounted charger, the grounding structure provided by the utility model can be conveniently installed in a limited space without influencing the layout and performance of other components. In products such as a direct-current converter, the compact structure can also meet the design goal of product miniaturization, and meanwhile, the grounding reliability and the current-carrying capacity are ensured.

Description

Technical Field

[0001] This utility model relates to the field of high-power fast charging electronic products for consumer and automotive applications, specifically a novel grounding structure that can carry large currents. Background Technology

[0002] With the continuous development of the times, electronic products have been widely used in all aspects of life. Consumers in different fields have put forward higher requirements for electronic products. In particular, with the rise of new energy vehicles, the demand for fast charging of new energy vehicle batteries has attracted more and more attention. From the initial slow charging, it has gradually developed to today's fast charging, and even in the future, there will be a need for higher power OBC / DCDC products to meet future market demands. As the power of products increases, conventional grounding methods are insufficient to meet the current carrying capacity of high-power, high-current circuits. Therefore, there is an urgent need for a newer and more reliable grounding structure to meet the current carrying requirements of products.

[0003] Chinese utility model patent specification CN209298571U discloses a high-voltage switchgear interlocking grounding structure, including a cabinet body, a cabinet door, an iron column, and an L-shaped plate. The cabinet body has a hinged door with a first magnet embedded in it. Elevating blocks are integrally formed with the cabinet body at its four bottom corners. A base plate with a circular hole and a screw-mounted groove is provided on the base plate. A sliding plate connects to the groove, and a second magnet is embedded in the front of the sliding plate. A second spring with a screw is mounted on the rear of the sliding plate, with the other end of the second spring connected to the side wall of the cabinet body. When the cabinet door is closed, the first and second magnets are on the same horizontal line. The iron column is located vertically to the circular hole and is connected to the top of the cabinet body via the first spring. The bottom of the cabinet body has an L-shaped plate connected to a support shaft, which is mounted on the ground. While the high-voltage switchgear interlocking grounding structure described in the prior art can theoretically meet the basic grounding requirements, it has significant limitations in practical applications.

[0004] Firstly, in terms of its components, the system comprises several parts, including the cabinet body, cabinet doors, iron columns, and L-shaped panels. A first magnet is embedded in the cabinet door. Elevating blocks are located at the four corners of the cabinet's bottom. The base plate has round holes and grooves for screw mounting. A sliding plate connects to these grooves and is embedded with a second magnet. A second spring, also mounted with screws, is located at the rear of the sliding plate and connects to the cabinet's side wall. Furthermore, the iron columns are connected to the top of the cabinet via the first spring. An L-shaped panel, connected to the support shaft, is located at the bottom of the cabinet, and the support is mounted on the ground. The interaction of so many components means that the entire structure requires significant time and effort to assemble and maintain. A problem with any one component can affect the normal operation of the entire grounding structure.

[0005] Secondly, from a space-occupying perspective, this structure is relatively large. The cabinet itself requires a certain amount of space to accommodate various internal components, and the addition of cabinet doors, sliding panels, and iron pillars further increases its size in three-dimensional space. In some space-constrained applications, such as small, high-power automotive products, this bulky grounding structure is clearly unsuitable. Taking an automotive charger as an example, its internal space is usually occupied by various electronic components and circuit boards, leaving extremely limited space for the grounding structure. If the grounding structure in the comparative document is adopted, it will not only increase the product's size but may also restrict the layout of other components, affecting the overall product design and performance. Similarly, products such as DC-DC converters face similar problems, thus requiring a compact structural design to meet the requirements of miniaturization and high performance, which the grounding structure in the comparative document clearly cannot meet.

[0006] In view of this, this utility model is hereby proposed. Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a new grounding structure that can carry large currents, thus solving the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0009] A novel grounding structure for carrying high current includes: a die-cast aluminum alloy housing assembly, a PCBA circuit board, and hexagonal stainless steel screws; characterized in that: an aluminum-magnesium alloy back cover is provided on the top of the PCBA circuit board, the PCBA circuit board is provided with mounting grooves and pads, and a high-conductivity copper alloy component is soldered to the bottom of the PCBA circuit board using SMT process with the pads; the PCBA circuit board, the high-conductivity copper alloy component, and the die-cast aluminum alloy housing assembly are fastened together by hexagonal stainless steel screws.

[0010] Optionally, the aluminum-magnesium alloy back cover has screw holes around its perimeter for securing the cover to the die-cast aluminum alloy housing assembly with screws.

[0011] Optionally, the high conductivity copper alloy part is designed with two screw holes for hexagonal Phillips-shaped stainless steel screws to pass through, and the bottom of the inner wall of the die-cast aluminum alloy housing assembly is provided with two screw posts for fastening hexagonal Phillips-shaped stainless steel screws (4).

[0012] Optionally, the bottom surface of the high conductivity copper alloy part is fitted with the top surface of the screw post of the die-cast aluminum alloy housing assembly with zero gap.

[0013] Optionally, two mounting pieces are fixedly connected to the lower sides of both sides of the outer wall of the die-cast aluminum alloy housing assembly.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0015] This invention's grounding structure for carrying high current employs a simple combination of components, including a die-cast aluminum alloy housing, a PCBA circuit board, and high-conductivity copper alloy parts. These components are secured together using hexagonal stainless steel screws, achieving the grounding current-carrying function. This structure is not only simple in design but also compact, perfectly suited to the space-constrained requirements of small, high-power automotive products. For example, in on-board chargers, this grounding structure can be easily installed in limited spaces without affecting the layout and performance of other components. In products such as DC-DC converters, its compact structure also meets the design goals of miniaturization while ensuring grounding reliability and current-carrying capacity. Therefore, this grounding structure has broad application prospects in small, high-power automotive products.

[0016] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0018] In the picture:

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. Aluminum-magnesium alloy back cover; 2. PCBA circuit board; 3. Die-cast aluminum alloy housing assembly; 4. Socket hexagonal stainless steel screws; 5. Solder pads; 6. High conductivity copper alloy parts; 7. Screw holes; 8. Screw posts.

[0022] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings.

[0024] Please see Figure 1As shown, this embodiment provides a novel grounding structure for carrying large currents, including a die-cast aluminum alloy housing assembly 3, a PCBA circuit board 2, and hexagonal stainless steel screws 4; characterized in that: an aluminum-magnesium alloy back cover is provided on the top of the PCBA circuit board 2, the PCBA circuit board 2 is provided with mounting grooves and pads 5, and a high conductivity copper alloy component 6 is soldered to the bottom of the PCBA circuit board 2 in conjunction with the pads 5 using SMT process; the PCBA circuit board 2, the high conductivity copper alloy component 6, and the die-cast aluminum alloy housing assembly 3 are fastened together by the hexagonal stainless steel screws 4.

[0025] This novel grounding structure for carrying high current offers significant advantages. It employs a simple assembly of components, including a die-cast aluminum alloy housing 3, a PCBA circuit board 2, and high-conductivity copper alloy parts 6, all secured together with hexagonal stainless steel screws 4, achieving effective grounding and current carrying capacity. This structure is not only simple in design but also compact, perfectly suited to the space-constrained requirements of small, high-power automotive products. For example, in on-board chargers, this grounding structure can be easily installed in limited spaces without affecting the layout and performance of other components. In products such as DC-DC converters, its compact structure also meets the miniaturization design goals while ensuring grounding reliability and current-carrying capacity. Therefore, this grounding structure has broad application prospects in small, high-power automotive products.

[0026] In this embodiment, the aluminum-magnesium alloy back cover has screw holes around its perimeter for securing it to the die-cast aluminum alloy housing assembly 3 with screws. The screw holes and screws work together to achieve a secure connection between the aluminum-magnesium alloy back cover and the die-cast aluminum alloy housing assembly 3. This connection method not only ensures structural stability but also facilitates disassembly and maintenance. In practical applications, this design allows for quick opening of the back cover for internal inspection or repair, improving product maintainability and ensuring the reliability of the grounding structure during use.

[0027] In this embodiment, the high-conductivity copper alloy part 6 is designed with two screw holes 7 for hexagonal Phillips-shaped stainless steel screws 4 to pass through, and the bottom of the inner wall of the die-cast aluminum alloy housing assembly 3 is provided with two screw posts 8 for fastening the hexagonal Phillips-shaped stainless steel screws 4. Through the screw holes 7 on the high-conductivity copper alloy part 6 and the screw posts 8 on the die-cast aluminum alloy housing assembly 3, a tight connection between the copper alloy part 6 and the housing assembly is achieved. The use of hexagonal Phillips-shaped stainless steel screws 4 not only provides sufficient preload force, ensuring good contact between the copper alloy part 6 and the housing assembly, but also enhances the reliability of grounding.

[0028] In this embodiment, the bottom surface of the high-conductivity copper alloy part 6 is in zero-gap contact with the top surface of the screw post 8 of the die-cast aluminum alloy housing assembly 3. This zero-gap contact design ensures optimal contact between the high-conductivity copper alloy part 6 and the die-cast aluminum alloy housing assembly 3. By eliminating any minute gaps between them, contact resistance can be minimized, thereby improving the efficiency and reliability of grounding.

[0029] Working principle: The high conductivity copper alloy component 6 is soldered onto the PCBA circuit board 2 using SMT process. The PCBA circuit board 2 is installed into the cast aluminum alloy housing assembly. Two internal hexagonal stainless steel screws 4 are passed through the opening of the high conductivity copper alloy component 6 and screwed into the screw post 8 on the cast aluminum alloy housing assembly. Due to the pre-tightening force of the screws 4, the high conductivity copper alloy component 6 soldered onto the PCBA circuit board 2 is brought into contact with the top surface of the screw post 8 on the aluminum alloy housing assembly, thereby achieving the grounding current carrying function.

[0030] This utility model is not limited to the above-described embodiments. Anyone should know that structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all publicly known technologies.

Claims

1. A novel grounding structure for carrying large currents, comprising: The die-cast aluminum alloy housing assembly (3), PCBA circuit board (2), and hexagonal stainless steel screws (4) are characterized in that: an aluminum-magnesium alloy back cover is provided on the top of the PCBA circuit board (2), the PCBA circuit board (2) is provided with mounting grooves and pads (5), and a high conductivity copper alloy part (6) is soldered to the bottom of the PCBA circuit board (2) in conjunction with the pads (5) by SMT process; the PCBA circuit board (2), the high conductivity copper alloy part (6), and the die-cast aluminum alloy housing assembly (3) are fastened together by hexagonal stainless steel screws (4).

2. The novel grounding structure for carrying large currents according to claim 1, characterized in that, The aluminum-magnesium alloy back cover has screw holes around its perimeter for fixing the cover to the die-cast aluminum alloy housing assembly (3) with screws.

3. The novel grounding structure for carrying large currents according to claim 1, characterized in that, The high conductivity copper alloy part (6) is designed with two screw holes (7) for hexagonal Phillips stainless steel screws (4) to pass through, and the bottom of the inner wall of the die-cast aluminum alloy housing assembly (3) is provided with two screw posts (8) for fastening hexagonal Phillips stainless steel screws (4).

4. A novel grounding structure for carrying large currents according to claim 1, characterized in that, The bottom surface of the high conductivity copper alloy part (6) is in zero-gap contact with the top surface of the screw post (8) of the die-cast aluminum alloy housing assembly (3).

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