An aluminum power battery through-box screw connector with a rotation limiting structure

Abstract

This utility model relates to the field of new energy vehicle power battery technology, specifically an aluminum power battery through-box screw connector with a rotation limiting structure. It includes an aluminum power battery through-box screw connector body, with an outer sealing surface and an inner sealing surface on the outer rings at both ends of the body. A through-flow fluid channel is provided within the body. A threaded surface is provided near the inner sealing surface, and a radial limiting groove is formed between the threaded surface and the inner sealing surface. This aluminum power battery through-box screw connector with a rotation limiting structure effectively reduces the cost of small-batch molding, increases strength, temperature resistance, and sealing performance, and extends service life. While improving thermal management performance, it prevents misalignment after installation, avoiding the problem of relative rotation due to the inability to limit the connection end of the vehicle hose, thus improving stability.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology for new energy vehicles, specifically an aluminum power battery through-box screw connector with a rotation limiting structure. Background Technology

[0002] In electric or hybrid vehicles, high-reliability connections are made between the battery pack liquid cooling system and the vehicle's cooling piping using power battery through-box threaded connectors. These connectors typically feature strong sealing, high electrical insulation, high mechanical strength, and ease of installation and maintenance.

[0003] The current mainstream power battery through-box bolt joints use PA66 injection molded joints, which are integrally injection molded and use flange docking. They lack an active limiting mechanism, have a tensile strength <80MPa, a thermal conductivity <0.3W / (m·K), and an operating temperature range of -40℃ to 120℃. Sealing is achieved through O-ring elastic compensation. However, the material has defects in terms of thermal aging, creep characteristics, and coefficient of thermal expansion. After a 2000h thermal aging test, the tensile strength decreases by >30%; under 1.5 times the working pressure for 500h, it produces 0.2mm of permanent deformation; and its coefficient of thermal expansion is 2.5×10⁻⁶. -5 The temperature fluctuations ( / ℃) cause stress fluctuations on the sealing surface under temperature cycling conditions. Simultaneously, mold costs are high, with minimum order quantities typically exceeding 5000 pieces, resulting in poor process economics. Existing metal joints also have functional limitations. While allowing free circumferential rotation and 360° rotation after installation, they also present space-consuming issues. Standard DIN flange structures require an installation thickness of ≥25mm, and disc structures necessitate a large mounting surface. The lack of limiting structures makes joint rotation under vibration conditions prone to pipeline twisting, and maintenance requires complete disassembly of the flange assembly, making maintenance inconvenient. Utility Model Content

[0004] The purpose of this utility model is to provide an aluminum power battery through-box screw connector with a rotation limiting structure, so as to solve the problems mentioned in the background art that the current power battery through-box screw connectors on the market have material defects, poor process economy and insufficient limiting function.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an aluminum power battery through-box screw connector with a rotation limiting structure, comprising an aluminum power battery through-box screw connector body, wherein the outer rings at both ends of the aluminum power battery through-box screw connector body are respectively provided with an outer sealing surface and an inner sealing surface, and a through-flow fluid channel is provided inside the aluminum power battery through-box screw connector body, wherein a threaded surface is provided near the inner sealing surface of the aluminum power battery through-box screw connector body, and a radial limiting groove is formed between the threaded surface and the inner sealing surface, wherein symmetrically arranged protrusions are integrally provided near the outer sealing surface of the aluminum power battery through-box screw connector body, and an axial limiting groove is formed between the protrusions and the outer sealing surface, wherein a support plate is integrally provided in the middle outer ring of the aluminum power battery through-box screw connector body, and a sealing groove is formed inside the support plate, and an O-ring and a nut are respectively installed on the aluminum power battery through-box screw connector body at the sealing groove and the threaded surface.

[0006] Preferably, the roughness of the outer sealing surface is less than Ra0.8, the length of the inner sealing surface is 19.9 mm, and the roughness of the inner sealing surface is less than Ra1.6.

[0007] Preferably, the support disk has a circular structure and a thickness of 6.7 mm.

[0008] Preferably, there are two protrusions, which are distributed on the diameter of the circumference of the aluminum power battery through-box screw connector body, and an arc-shaped surface is provided at the end of the protrusion near the axial limiting groove.

[0009] Preferably, the length of the threaded surface is 10.8 mm, and the side of the threaded surface is provided with a cut surface.

[0010] Preferably, the inner and outer rings of the O-ring are evenly spaced with integrally formed fastening protrusions, and the O-ring is fastened to the sealing groove by the fastening protrusions.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This aluminum power battery through-box screw connector with a rotation limit structure effectively reduces the cost of small-batch mold opening, increases strength, temperature resistance, sealing performance, and extends service life. While improving thermal management performance, it prevents misalignment after installation, avoids the problem of relative rotation due to the inability to limit the connection end of the vehicle hose, and improves stability.

[0013] 2. The aluminum power battery through-box screw connector with rotation limit structure eliminates the traditional flange structure. The fastening of the nut is achieved through the support plate, avoiding the influence of nut torque. While ensuring installation strength and firmness, it avoids the flange occupying installation space. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of an aluminum power battery through-box screw connector with a rotation limiting structure according to this utility model.

[0015] Figure 2 This is a schematic diagram of the main structure of an aluminum power battery through-box screw connector with a rotation limiting structure according to this utility model;

[0016] Figure 3 This is a schematic diagram of the support plate part of an aluminum power battery through-box screw connector with a rotation limiting structure according to this utility model.

[0017] Figure 4 This is a side view of the O-ring of an aluminum power battery through-box screw connector with a rotation limiting structure according to this utility model.

[0018] Figure 5 This is a three-dimensional structural diagram of an O-ring for an aluminum power battery through-box screw connector with a rotation limiting structure according to this utility model.

[0019] Figure 6 This is a schematic diagram of the back structure of the nut of an aluminum power battery through-box screw connector with a rotation limiting structure according to this utility model.

[0020] Figure 7 This is a front view of the nut structure of the aluminum power battery through-box screw connector with a rotation limiting structure according to this utility model.

[0021] In the diagram: 1. Main body of aluminum power battery through-box screw connector; 101. Outer sealing surface; 102. Axial limiting groove; 103. Support plate; 104. Sealing groove; 105. Cross-section; 106. Protrusion; 107. Radial limiting groove; 108. Inner sealing surface; 109. Fluid pipe channel; 1010. Threaded surface; 1011. Arc-shaped surface; 2. O-ring; 201. Fastening protrusion; 3. Nut. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-7This utility model provides a technical solution: an aluminum power battery through-box screw connector with a rotation limiting structure, comprising an aluminum power battery through-box screw connector body 1. The outer rings at both ends of the aluminum power battery through-box screw connector body 1 are respectively provided with an outer sealing surface 101 and an inner sealing surface 108. The roughness of the outer sealing surface 101 is less than Ra0.8, and the length of the inner sealing surface 108 is 19.9mm, and the roughness of the inner sealing surface 108 is less than Ra1.6. This structure allows the aluminum power battery through-box screw connector body 1 to form inner and outer sealing structures through the outer sealing surface 101 and the inner sealing surface 108, respectively, sealing with the vehicle hose connector through the outer sealing surface 101. The inner sealing surface 108 mates with the inner wall of the liquid pipe connector inside the battery pack to form an effective seal. The aluminum power battery through-box screw connector body 1 has a through-flow liquid pipe channel 109. A threaded surface 1010 is provided near the inner sealing surface 108 of the aluminum power battery through-box screw connector body 1, and a radial limiting groove 107 is formed between the threaded surface 1010 and the inner sealing surface 108. Symmetrically arranged protrusions 106 are integrally provided near the outer sealing surface 101 of the aluminum power battery through-box screw connector body 1, and an axial limiting groove 102 is formed between the protrusions 106 and the outer sealing surface 101. There are two protrusions 106, and the protrusions 106... 06 are distributed on the diameter of the circumference of the aluminum power battery through-box screw connector body 1, and an arc-shaped surface 1011 is provided at one end of the protrusion 106 near the axial limiting groove 102. This structure, through the cooperation of the protrusion 106 and the axial limiting groove 102, can achieve a clearance fit between the aluminum power battery through-box screw connector body 1 and the concave structure of the vehicle end, so that the vehicle hose will not rotate axially after assembly. The arc-shaped surface 1011 can reduce the scraping friction during assembly and facilitate installation. The outer ring of the middle part of the aluminum power battery through-box screw connector body 1 is also integrally provided with a support plate 103. The support plate 103 is a disc structure and the thickness of the support plate 103 is 6.7mm. This structure reduces the need for traditional flanges. This design reduces the space occupied by the installation structure and sets the support plate 103 as a positioning structure. The support plate 103 fits into the battery box to form a support structure, ensuring installation tightness and providing sufficient strength to withstand the large torque of the nut 3. The nut 3 and the support plate 103 cooperate to form a fixing structure between the aluminum power battery through-box screw connector body 1 and the battery box, realizing the through-box treatment of the aluminum power battery through-box screw connector body 1. The support plate 103 has a sealing groove 104, and O-rings 2 and nuts 3 are respectively installed on the aluminum power battery through-box screw connector body 1 at the sealing groove 104 and the threaded surface 1010. The length of the threaded surface 1010 is 10.The threaded surface 1010 has a diameter of 8mm and a cut surface 105 on its side. This structure allows the threaded surface 1010 to fit tightly with the nut 3, ensuring the tightness of the nut 3 relative to the aluminum power battery through-box screw connector body 1. The cut surface 105 creates a hole gap between the aluminum power battery through-box screw connector body 1 and the box body. Since the box body also has irregularly shaped holes of the same shape, it can achieve radial limiting of the aluminum power battery through-box screw connector body 1, effectively preventing axial rotation of the aluminum power battery through-box screw connector body 1. When there are no significant differences between the two ends of the main body 1 of the power battery through-box screw connector, the cut surface 105 can also serve as a foolproof mark to ensure the correct installation of the aluminum power battery through-box screw connector body 1 and improve the installation efficiency of the aluminum power battery through-box screw connector body 1. The inner and outer rings of the O-ring 2 are evenly spaced with integrally formed fastening protrusions 201, and the O-ring 2 is fastened to the sealing groove 104 through the fastening protrusions 201. This structure ensures that the O-ring 2 is securely fastened within the sealing groove 104, guaranteeing reliable positioning of the O-ring 2.

[0024] Working principle: When using the aluminum power battery through-box screw connector with rotation limiting structure, firstly, the O-ring 2 is fastened into the sealing groove 104 through the fastening protrusion 201. Then, the aluminum power battery through-box screw connector body 1 passes through the battery box, and the cut surface 105 limits the aluminum power battery through-box screw connector body 1 to prevent rotation. At this time, the support plate 103 supports the outside of the battery box. From the inside of the battery box, the nut 3 is put onto the threaded surface 1010 and rotated to tighten it, so that the nut 3 cooperates with the support plate 103, realizing the stability of the aluminum power battery through-box screw connector body 1 relative to the battery box. The O-ring 2 plays a sealing role. Then, the aluminum power battery through-box screw connector body 1 cooperates with the sealing ring of the vehicle hose connector through the outer sealing surface 101 to form an effective seal. The protrusion 106 cooperates with the axial limiting groove 102. 102 cooperates with the spring structure of the vehicle hose connector. When the spring of the vehicle hose connector is engaged with the axial limiting groove 102, axial limiting is achieved, and thrust is also achieved, preventing axial translation or misalignment between the two. To ensure effective limiting, the edge of the axial limiting groove 102 must not be chamfered, so that the vehicle hose and the aluminum power battery through-box screw connector body 1 will not rotate axially after assembly. The arc surface 1011 can reduce the scraping friction during assembly. Then, the inner sealing surface 108 cooperates with the inner wall of the liquid pipe connector in the battery pack to form a seal. The radial limiting groove 107 cooperates with the snap-fit ​​in the liquid pipe connector in the battery pack. When the snap-fit ​​in the liquid pipe connector is assembled in place, it will be engaged in the radial limiting groove 107, and thrust is also achieved. To ensure effective limiting at the axial limiting groove 102 and the radial limiting groove 107, the edges must not be chamfered. The liquid pipe channel 109 realizes the connection between the vehicle hose and the liquid pipe in the battery pack, thereby completing a series of operations.

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An aluminum power battery through-box screw connector with a rotation limiting structure, comprising an aluminum power battery through-box screw connector body (1), characterized in that: The aluminum power battery through-box screw connector body (1) has an outer sealing surface (101) and an inner sealing surface (108) on its outer rings at both ends, and a through-hole fluid channel (109) is provided inside the aluminum power battery through-box screw connector body (1). A threaded surface (1010) is provided near the inner sealing surface (108) of the aluminum power battery through-box screw connector body (1), and a radial limiting groove (107) is provided between the threaded surface (1010) and the inner sealing surface (108). The aluminum power battery through-box screw connector body (1) near the inner sealing surface (108) is provided with a threaded surface (1010). The outer sealing surface (101) is integrally provided with symmetrically arranged protrusions (106), and an axial limiting groove (102) is opened between the protrusions (106) and the outer sealing surface (101). The outer ring of the middle part of the aluminum power battery through-box screw connector body (1) is also integrally provided with a support plate (103), and a sealing groove (104) is opened in the support plate (103). O-rings (2) and nuts (3) are respectively installed on the aluminum power battery through-box screw connector body (1) at the sealing groove (104) and the threaded surface (1010).

2. The aluminum power battery through-box screw connector with a rotation limiting structure according to claim 1, characterized in that: The roughness of the outer sealing surface (101) is less than Ra0.8, the length of the inner sealing surface (108) is 19.9 mm, and the roughness of the inner sealing surface (108) is less than Ra1.

6.

3. The aluminum power battery through-box screw connector with a rotation limiting structure according to claim 1, characterized in that: The support plate (103) has a circular structure and a thickness of 6.7 mm.

4. The aluminum power battery through-box screw connector with a rotation limiting structure according to claim 1, characterized in that: Two protrusions (106) are provided, and the protrusions (106) are distributed on the diameter of the circumference of the aluminum power battery through-box screw connector body (1), and an arc-shaped surface (1011) is provided at the end of the protrusion (106) near the axial limiting groove (102).

5. The aluminum power battery through-box screw connector with a rotation limiting structure according to claim 1, characterized in that: The length of the threaded surface (1010) is 10.8 mm, and the side of the threaded surface (1010) is provided with a cut surface (105).

6. The aluminum power battery through-box screw connector with a rotation limiting structure according to claim 1, characterized in that: The O-ring (2) has integrally formed fastening protrusions (201) evenly spaced on its inner and outer rings, and the O-ring (2) is fastened to the sealing groove (104) by the fastening protrusions (201).

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