Top cover for preventing post terminal of injection molding structure from sinking

Abstract

The utility model provides a top cover for preventing an injection molding structure pole from sinking, the top cover comprises a top cover main body, a pole, a first insulating part, a sealing part and a fixing part, the first insulating part is provided with an assembling hole, one end of the pole is provided with a limiting part, and the other end of the pole penetrates through the assembling hole, the sealing part and the top cover main body and then extends in the direction away from the top cover main body; the limiting part is positioned on one surface, far away from the top cover main body, of the first insulating part, and the aperture of the assembly hole is smaller than the outer diameter of the limiting part; the fixing piece is fixedly arranged on the pole, the fixing piece is pressed on the surface of the top cover main body, the fixing piece and the limiting part are matched to axially limit the pole, the fixing piece is made of an aluminum alloy material, and the surface of the fixing piece is coated with an aluminum oxide insulating layer. The pole disclosed by the utility model does not rise or sink relative to the top cover main body, so that the situation that the pole sinks due to creep deformation of the injection molding structure caused by high temperature influence in the production process of the battery is avoided, and the problem that the pole on the traditional top cover with the injection molding structure sinks is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a top cover for preventing a pole of an injection-molded structure from sinking. Background Art

[0002] With the continuous development of new energy, the application scenarios of secondary batteries are becoming more and more extensive. Most of the existing secondary batteries use injection molding structures to limit and fix the poles on the top cover, and the injection molding structure also forms a sealing structure with the poles and the top cover, so that the poles and the top cover together compress the sealing ring to seal the inside of the battery to prevent the leakage of the electrolyte inside the battery. However, since the injection molding structure is made of polymer materials and has secondary crystallization characteristics, during the battery production process, the injection molding structure is easily affected by high temperature and creep occurs, causing its structure to change. At the same time, under the joint action of the elastic force of the sealing ring, the position of the pole will shift, often causing the pole to sink, thereby affecting the reliability of the sealing structure, and even causing the electrolyte inside the battery to leak, seriously affecting the use of the battery. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present application provides a top cover for preventing an injection-molded structure pole from sinking.

[0004] The present application discloses a top cover for preventing a pole of an injection-molded structure from sinking, comprising: a top cover body, a pole, a first insulating member, a sealing member and a fixing member, wherein the first insulating member is provided with an assembly hole, a limiting portion is provided at one end of the pole, and the other end of the pole extends in a direction away from the top cover body after passing through the assembly hole, the sealing member and the top cover body, the limiting portion is located on a side of the first insulating member away from the top cover body, and the aperture of the assembly hole is smaller than the outer diameter of the limiting portion; the fixing member is fixed to the pole, and the fixing member is pressed against the surface of the top cover body, and the fixing member and the limiting portion cooperate to axially limit the pole; the fixing member is made of aluminum alloy, and an aluminum oxide insulating layer is coated on the surface of the fixing member.

[0005] Preferably, a limiting groove is provided on the side surface of the other end of the pole, the inner edge of the fixing member is snap-fitted and fixed in the limiting groove, and the outer edge of the fixing member is pressed against the surface of the top cover body.

[0006] Preferably, the fixing member has an opening, and the fixing member can be inserted into the limiting groove along the radial direction of the pole through the opening.

[0007] Preferably, an injection molding groove is provided on the inner edge of the fixing piece.

[0008] Preferably, a limiting hole is provided at the other end of the pole along its radial direction, a fixing member is fixedly inserted into the limiting hole, and an end of the fixing member is pressed against the surface of the top cover body.

[0009] Preferably, the top cover body is provided with a second insulating member, which wraps the fixing member and separates the top cover body from the pole.

[0010] Preferably, the bending strength of the fixing piece is not less than 65 MPa.

[0011] Preferably, the fixing part deforms by no more than 0.15 mm within 10 seconds at 500-600°C.

[0012] Preferably, the leakage current of the fixing part is not greater than 2 mA for 2 seconds under a DC voltage of 1000V.

[0013] Preferably, the thickness of the fixing member is not less than 1.3 mm, and the thickness of the alumina insulating layer is not less than 30 μm.

[0014] The beneficial effect of the present application is that: through the limiting effect of the fixing part and the limiting part on the pole, when the top cover is assembled, the pole does not rise or sink relative to the top cover body, replacing the previous method of using injection molding steps to limit the axial movement of the pole, and at the same time avoiding the creep of the injection molding structure due to high temperature during the production process of the battery, which leads to the sinking of the pole, solves the industry problem that the pole on the top cover with a traditional injection molding structure will sink, ensures the sealing of the battery, and improves the quality of the battery.

[0015] At the same time, the production process of the fixings is mature and can be produced in large quantities, thus reducing the manufacturing cost.

[0016] In addition, the installation of fixings can be mechanized by arranging presses and pushing equipment, which can meet the mass production of top covers and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 It is a schematic diagram of the structure of the top cover for preventing the injection-molded structure pole from sinking in the first embodiment;

[0019] Figure 2 Another schematic diagram of the structure of the top cover for preventing the injection-molded structure pole from sinking in the first embodiment;

[0020] Figure 3 It is a cross-sectional view of a top cover for preventing the injection-molded structure pole from sinking in the first embodiment;

[0021] Figure 4 for Figure 3 A magnified view of part A;

[0022] Figure 5It is a structural schematic diagram of the top cover body in the first embodiment;

[0023] Figure 6 It is a schematic diagram of the structure of the pole in the first embodiment;

[0024] Figure 7 is a schematic structural diagram of the first insulating member in Embodiment 1;

[0025] Figure 8 It is a schematic structural diagram of the first insulating member equipped with a pole and a sealing member in the first embodiment;

[0026] Fig. 9 It is a schematic diagram of the structure of the fixing member in the first embodiment;

[0027] Fig.10 It is a schematic diagram of the structure of the fixing member in other embodiments;

[0028] Fig.11 It is a schematic diagram of the structure of the fixing member in other embodiments;

[0029] Fig.12 It is a schematic diagram of the structure of the fixing member in other embodiments;

[0030] Fig.13 is a schematic structural diagram of the second insulating member in Embodiment 1;

[0031] Fig.14 It is a schematic diagram of the structure of the top cover for preventing the injection-molded structure pole from sinking in the second embodiment;

[0032] Fig.15 It is a schematic diagram of the structure of the pole in the second embodiment.

[0033] Reference numerals:

[0034] 1. Top cover body; 11. Pole assembly hole; 12. Liquid injection hole; 13. Explosion-proof hole; 14. Second insulating member; 2. Pole; 21. Limiting part; 22. Pole body; 221. Limiting groove; 222. Limiting hole; 3. First insulating member; 31. Assembly hole; 4. Sealing member; 5. Fixing member; 51. Injection groove. DETAILED DESCRIPTION

[0035] The following will disclose multiple embodiments of the present application with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present application. In other words, in some embodiments of the present application, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0036] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, in the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present application. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0038] In order to further understand the application content, features and effects of the present application, the following embodiments are cited and described in detail with reference to the accompanying drawings.

[0039] Embodiment 1:

[0040] Reference Figure 1-Figure 4 , Figure 1 This is a schematic diagram of the structure of the top cover for preventing the injection-molded structure pole from sinking in the first embodiment. Figure 2 This is another schematic diagram of the structure of the top cover for preventing the injection-molded structure pole from sinking in the first embodiment. Figure 3 This is a cross-sectional view of the top cover for preventing the injection-molded structure pole from sinking in the first embodiment. Figure 4 for Figure 3 The enlarged view of the A part in the middle shows that the top cover for preventing the injection-molded structure pole from sinking in this embodiment includes a top cover body 1, a pole 2, a first insulating member 3, a sealing member 4 and a fixing member 5. The first insulating member 3 is provided with an assembly hole 31. One end of the pole 2 is provided with a limiting portion 21. The other end of the pole 2 extends away from the top cover body 1 after passing through the assembly hole 31, the sealing member 4 and the top cover body 1. The limiting portion 21 is located on the side of the first insulating member 3 away from the top cover body 1, and the aperture of the assembly hole 31 is smaller than the outer diameter of the limiting portion 21. The fixing member 5 is fixed to the pole 2, and the fixing member 5 is pressed against the surface of the top cover body 1. The fixing member 5 and the limiting portion 21 cooperate to axially limit the pole 2. The fixing member 5 is made of aluminum alloy, and the surface of the fixing member 5 is coated with an alumina insulating layer.

[0041] The top cover for preventing the injection-molded structure pole from sinking in this embodiment can be applied to various secondary batteries. Since the fixing member 5 is fixed to the pole 2 and pressed against the upper surface of the top cover body 1, the pole 2 cannot move downward in the axial direction, that is, it will not sink relative to the top cover body 1, and the limiting portion 21 arranged at one end of the pole 2 is located on the side of the first insulating member 3 away from the top cover body 1, and the aperture of the assembly hole 31 is smaller than the outer diameter of the limiting portion 21, that is, the limiting portion 21 cannot pass through the assembly hole 31, that is, the limiting portion 21 limits the movement of the pole 2 in the axial direction, so that the pole 2 will not rise relative to the top cover body 1. In this way, through the limiting effect of the fixing member 5 and the limiting portion 21 on the pole 2, when the top cover is assembled, the pole 2 does not rise or sink relative to the top cover body 1, replacing the previous method of using injection molding steps to limit the axial movement of the pole 2. At the same time, it avoids the creep of the injection molding structure due to the influence of high temperature during the production process of the battery, which causes the pole 2 to sink, and solves the industry problem that the pole 2 on the top cover with a traditional injection molding structure will sink, ensuring the sealing of the battery and improving the quality of the battery. The axial direction described in this embodiment is the axial direction of the pole 2, the sinking direction is the connecting direction from the top cover body 1 to the first insulating member 3, the rising direction is the opposite direction of the sinking direction, the lower surface of the top cover body 1 is the side of the top cover body 1 facing the first insulating member 3, and the upper surface of the top cover body 1 is the side opposite to the lower surface.

[0042] Refer to Figure 5 , Figure 5 It is a schematic diagram of the structure of the top cover body in the first embodiment. Specifically, the top cover body 1 is a top cover aluminum plate, and its shape can be adapted according to the shape of the battery, and can be square, round or irregular, etc. This embodiment is introduced with the top cover aluminum plate as a square shape. In this embodiment, the number of poles 2 is two, namely the positive pole and the negative pole, and two pole assembly holes 11 are correspondingly provided on the top cover aluminum plate, and the positive pole and the negative pole pass through one of the pole assembly holes 11 respectively. Furthermore, the top cover aluminum plate can also be provided with an injection hole 12 and an explosion-proof hole 13 according to actual needs. The injection hole 12 is used to inject electrolyte into the battery, and the explosion-proof hole 13 is used to install an explosion-proof valve. Of course, in other embodiments, the top cover aluminum plate may not be provided with an injection hole 12 and an explosion-proof hole 13, which is not limited here.

[0043] Refer to Figure 6 , Figure 6It is a schematic diagram of the structure of the pole in the first embodiment. Preferably, the pole 2 in this embodiment includes a pole body 22 and a limiting portion 21. The limiting portion 21 is provided at one end of the pole body 22. The outer diameter of the limiting portion 21 is greater than the outer diameter of the pole body 22. The other end of the pole body 22 passes through the assembly hole 31, the seal 4 and the pole assembly hole 11 and then extends in a direction away from the top cover body 1. In this embodiment, the cross section of the pole body 22 is circular, and the limiting portion 21 is a square flange. Of course, in other embodiments, the pole body 22 and the limiting portion 21 can also be set to other shapes, which can be adapted according to the shapes of the assembly hole 31, the seal 4 and the pole assembly hole 11, which is not limited here.

[0044] Refer to Figure 4 and Figure 7-Figure 8 , Figure 7 is a schematic structural diagram of the first insulating member in Embodiment 1, Figure 8 The first insulating member 3 is a structural schematic diagram of the first embodiment of the present invention, wherein the first insulating member 3 is a plastic plate, and the number of the assembly holes 31 is two, one of which is adapted to the positive pole, and the other is adapted to the negative pole. In this embodiment, the seal 4 is a sealing rubber ring. The sealing rubber ring is sleeved outside the pole body 22 and fits with the upper surface of the flange, and the sealing rubber ring is also fitted with the lower surface of the top cover body 1, that is, the sealing rubber ring is pressed between the flange and the top cover body 1, so that the sealing rubber ring, the flange and the pole body 22 cooperate to completely seal the pole assembly hole 11. At the same time, the plastic plate is respectively fitted with the upper surface of the flange and the lower surface of the top cover body 1, thereby avoiding the top cover body 1 from contacting the pole 2, and avoiding the top cover body 1 from contacting the battery cell inside the battery, and because the sealing rubber ring is located in the assembly hole 31 of the plastic plate, the sealing performance is further improved.

[0045] Refer to Fig. 9 , Fig. 9The structural diagram of the fixing member in the first embodiment is shown in FIG. 2 . Preferably, a limiting groove 221 is provided on the side of the other end of the pole 2, the inner edge of the fixing member 5 is fixed in the limiting groove 221, and the outer edge of the fixing member 5 is pressed against the surface of the top cover body 1. The fixing member 5 in this embodiment is a retaining ring, and an opening is provided on its side. The fixing member 5 is inserted into the limiting groove 221 in the radial direction of the pole 2 through the opening. The limiting groove 221 limits and fixes the fixing member 5, so that it is stably fixed on the pole 2 without moving in the axial direction, and the outer edge of the fixing member 5, that is, the part exposed in the limiting groove 221, is pressed against the upper surface of the top cover body 1, thereby preventing the pole 2 from sinking in the axial direction. In detail, after the other end of the pole body 22 passes through the assembly hole 31, the sealing rubber ring and the pole assembly hole 11, the other end of the pole body 22 protrudes relative to the upper surface of the top cover body 1, and the limiting groove 221 is also exposed on the upper surface of the top cover body 1. At this time, the fixing member 5 can be inserted into the limiting groove 221 along the radial direction of the pole 2 by a pushing device, that is, radially inserted into the pole 2. It can be understood that before the fixing member 5 is inserted into the limiting groove 221, a part of the limiting groove 221 is exposed on the upper surface of the top cover body 1, and a part is located in the pole assembly hole 11. During the process of the fixing member 5 being inserted, since the outer edge of the fixing member 5 is pressed against the upper surface of the top cover body 1, in order to enable the fixing member 5 to be completely inserted into the limiting groove 221, pressure can be applied to the flange and the top cover body 1 in the axial direction by a press. At this time, the sealing rubber ring is squeezed and compressed by the flange and the top cover body 1, further improving the sealing performance of the sealing rubber ring. When the fixing member 5 is completely inserted into the limiting groove 221, the part of the fixing member 5 exposed outside the limiting groove 221 is pressed against the upper surface of the top cover body 1. Since the sealing rubber ring itself is elastic, the sealing rubber ring pushes the flange and the pole body 22 to have a tendency to sink. However, the fixing member 5 limits the sinking tendency of the flange and the pole body 22 by cooperating with the limiting groove 221, so that the flange and the pole body 22 cannot sink. Similarly, since the outer diameter of the flange is larger than the outer diameter of the assembly hole 31, the flange and the pole body 22 cannot move upward, thereby ensuring the fixation of the position of the pole 2. It should be particularly noted that the insertion of the fixing member 5 can be achieved by arranging a press and a pushing device to achieve mechanized production, which can meet the mass production of the top cover and improve production efficiency.

[0046] Re-reference Fig. 9 Preferably, an injection molding groove 51 is provided on the inner edge of the fixing member 5. After the fixing member 5 is inserted into the limiting groove 221, through the setting of the injection molding groove 51, in the subsequent process of forming the injection molding structure by injection molding, the plastic can be injected into the gap between the pole 2 and the top cover body 1 through the injection molding groove 51, so that the injection molding structure can better wrap the fixing member 5.

[0047] Refer to Figure 10-12, in specific applications, since the sealing rubber ring is in a compressed state, it has a certain resilience. This resilience acts on the fixing member 5 through the terminal post 2, making the fixing member 5 prone to being fractured and failing. Therefore, before assembling the fixing member 5, a push-pull test is performed on the terminal post 2 to find a fixing member 5 with appropriate bending strength. The force-bearing area size, thickness, and material bending strength of the fixing member 5 all affect the service life of the fixing member 5. In this embodiment, the thickness of the fixing member 5 is 1.5 mm, and the bending strength is greater than 160 MPa. It should be particularly noted that in other embodiments, the fixing member 5 can adopt an annular structure. It can be sleeved on the limiting groove 221 of the terminal post main body 22 and then assembled by riveting the upper surface of the terminal post main body 22. It can also adopt other shapes with openings, such as U-shaped Fig.10 , semi-circular ring-shaped Fig.11 , "U"-shaped Fig.12 , etc. When using an annular fixing member 5, the bending strength of the material of the fixing member 5 is not less than 65 MPa, while the bending strength of the U-shaped, semi-circular ring-shaped, and "U"-shaped fixing members 5 is not less than 120 MPa. In short, according to the different shapes and thicknesses of the fixing member 5, fixing members 5 with different bending strengths should be selected correspondingly.

[0048] Preferably, in this embodiment, the number of fixing members 5 is two. One fixing member 5 is snap-fitted and fixed in the limiting groove 221 of the positive terminal post, and the other fixing member 5 is snap-fitted and fixed in the limiting groove 221 of the negative terminal post. Specifically, the fixing member 5 in this embodiment is an AL6010 aluminum alloy retaining ring, and its surface is coated with an alumina ceramic insulating layer. When the thickness of the AL6010 aluminum alloy retaining ring is not less than 1.3 mm, it can meet the push-pull force requirements of the terminal post. When the thickness of the alumina insulating layer reaches more than 30 μm, it can meet the insulation requirement that the leakage current is not greater than 2 mA when the DC voltage between the terminal post 2 and the top cover main body 1 is 1000 V for 2 seconds. It can be applied to the common situation where insulation is required between the negative terminal post and the top cover main body 1, or the situation where insulation is required between both the positive and negative terminal posts and the top cover main body 1. Coating the surface of such an aluminum alloy retaining ring with an alumina insulating layer can be achieved by the hard anodizing processing method. Its production process is mature, the cost is low, and it can be mass-produced. In this way, the bending strength requirement for the fixing member 5 can be easily met, and at the same time, the insulation performance requirement for the fixing member 5 can also be met. Furthermore, the fixing member 5 needs to have a deformation of no more than 0.15 mm, or even no deformation, within 10 s at 500 - 600 °C, to avoid the deformation of the fixing member 5 caused by high temperature during the production process of the battery, resulting in the sinking of the terminal post 2. The aluminum alloy retaining ring with an alumina ceramic insulating layer on its surface in this embodiment can meet this requirement.

[0049] Refer to Fig.13 , Fig.13It is a structural schematic diagram of the second insulating member in the first embodiment. Preferably, the top cover body 1 is also provided with a second insulating member 14, which wraps the fixing member 5 and separates the top cover body 1 and the pole 2. In specific applications, the outer diameter of the pole body 22 is slightly smaller than the aperture of the pole assembly hole 11. Under normal circumstances, the pole body 22 does not contact the top cover body 1, but the pole body 22 accidentally contacts the top cover body 1 due to external forces and other factors, which will cause a short circuit in the battery. Through the setting of the second insulating member 14, the pole body 22 is physically isolated from the top cover body 1, that is, the two are separated. Specifically, the second insulating member 14 is made of an insulating material, and a pole hole is opened on it. The second insulating member 14 is sleeved outside the pole body 22 through the pole hole, and the second insulating member 14 wraps and fixes the fixing member 5, and the base of the second insulating member 14 is fixedly connected to the upper surface of the top cover body 1. The second insulating member 14 can be used to strengthen the connection between the fixing member 5 and the top cover body 1, so that the fixing member 5 can better limit the axial position of the pole 2. It can be understood that the second insulating member 14 is equivalent to limiting the radial displacement of the pole 2, so that the pole body 22 will not be accidentally connected to the top cover body 1 due to external forces and other factors, resulting in a short circuit of the battery. Specifically, the second insulating member 14 is an injection molding structure formed by injection molding. When the plastic is injected into the limiting groove 221 on the pole body 22, an injection molding step can be formed. The injection molding step can also axially limit the pole 2, and even if the injection molding step creeps due to high temperature during the production process of the battery, the pole 2 will not sink because the fixing member 5 axially limits the pole 2.

[0050] Embodiment 2:

[0051] Reference Fig.14 and 15 , Fig.14 This is a schematic diagram of the structure of the top cover for preventing the injection-molded structure pole from sinking in the second embodiment. Fig.15The schematic diagram of the structure of the pole in the second embodiment is that the top cover for preventing the injection-molded structure pole from sinking in this embodiment is different from that in the first embodiment in that the pole 2 in this embodiment does not have a limiting groove 221, but a limiting hole 222 is provided at the other end of the pole 2 along its radial direction, and the fixing member 5 is fixedly penetrated in the limiting hole 222, and the end of the fixing member 5 is pressed against the surface of the top cover body 1. In specific application, after the other end of the pole body 22 passes through the assembly hole 31, the sealing rubber ring and the pole assembly hole 11, the other end of the pole body 22 protrudes relative to the upper surface of the top cover body 1, and the limiting hole 222 is also exposed on the upper surface of the top cover body 1, the sealing rubber ring is compressed, and the fixing member 5 is inserted into the limiting hole 222, and both ends of the fixing member 5 are exposed outside the limiting hole 222, and the two ends of the fixing member 5 are pressed against the surface of the top cover body 1. Due to the rebound force formed by the compression of the sealing rubber ring, the sealing rubber ring pushes the flange to have a tendency to sink, that is, the pole 2 has a tendency to sink, and the fixing member 5 is pressed against the upper surface of the top cover body 1, hindering the sinking of the pole 2 and eliminating the risk of the pole 2 sinking. Furthermore, the material and performance requirements of the fixing member 5 in this embodiment are similar to those in the previous text and will not be repeated here. Specifically, the fixing member 5 in this embodiment is cylindrical, and the limiting hole 222 is a circular hole. Of course, in other embodiments, the limiting hole 222 can be a different shape such as a circle or a square, and the shape of the fixing member 5 is adapted to the limiting hole 222.

[0052] In summary, through the limiting effect of the fixing parts and the limiting part on the pole, when the top cover is assembled, the pole does not rise or sink relative to the main body of the top cover, replacing the previous method of using injection molding steps to limit the axial movement of the pole. At the same time, it avoids the creep of the injection molding structure due to the influence of high temperature during the production process of the battery, which causes the pole to sink. It solves the industry problem that the pole on the top cover with traditional injection molding structure will sink, ensures the sealing of the battery, and improves the quality of the battery. At the same time, the production process of the fixing parts is mature, and can be mass-produced to reduce manufacturing costs. In addition, the installation of the fixing parts can be mechanized by arranging presses and pushing equipment, which can meet the mass production of the top cover and improve production efficiency.

[0053] The above is only the implementation mode of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A top cover for preventing an injection-molded structure pole from sinking, characterized in that: include: A top cover body (1), a pole (2), a first insulating member (3), a sealing member (4) and a fixing member (5), wherein the first insulating member (3) is provided with an assembly hole (31), one end of the pole (2) is provided with a limiting portion (21), the other end of the pole (2) passes through the assembly hole (31), the sealing member (4) and the top cover body (1) and then extends in a direction away from the top cover body (1), the limiting portion (21) is located on a side of the first insulating member (3) away from the top cover body (1), and the diameter of the assembly hole (31) is smaller than the outer diameter of the limiting portion (21); the fixing member (5) is fixed to the pole (2), and the fixing member (5) is pressed against the surface of the top cover body (1), and the fixing member (5) and the limiting portion (21) cooperate to axially limit the pole (2); the fixing member (5) is made of aluminum alloy, and the surface of the fixing member (5) is coated with an aluminum oxide insulating layer.

2. The top cover for preventing the injection-molded structure pole from sinking according to claim 1, characterized in that: A limiting groove (221) is provided on the side surface of the other end of the pole (2), the inner edge of the fixing member (5) is snap-fitted and fixed in the limiting groove (221), and the outer edge of the fixing member (5) is pressed against the surface of the top cover body (1).

3. The top cover for preventing the injection-molded structure pole from sinking according to claim 2, characterized in that: The fixing member (5) has an opening, and the fixing member (5) can be inserted into the limiting groove (221) along the radial direction of the pole (2) through the opening.

4. The top cover for preventing the injection-molded structure pole from sinking according to claim 2, characterized in that: An injection molding groove (51) is provided on the inner edge of the fixing member (5).

5. The top cover for preventing the injection-molded structure pole from sinking according to claim 1, characterized in that: The other end of the pole (2) is provided with a limiting hole (222) along its radial direction, the fixing member (5) is fixedly inserted into the limiting hole (222), and the end of the fixing member (5) is pressed against the surface of the top cover body (1).

6. The top cover for preventing the injection-molded structure pole from sinking according to any one of claims 1 to 5, characterized in that: The top cover body (1) is provided with a second insulating member (14), and the second insulating member (14) wraps the fixing member (5) and separates the top cover body (1) and the pole (2).

7. The top cover for preventing the injection-molded structure pole from sinking according to any one of claims 1 to 5, characterized in that: The bending strength of the fixing member (5) is not less than 65 MPa.

8. The top cover for preventing the injection-molded structure pole from sinking according to any one of claims 1 to 5, characterized in that: The fixing member (5) has a deformation of no more than 0.15 mm within 10 seconds at 500-600°C.

9. The top cover for preventing the injection-molded structure pole from sinking according to any one of claims 1 to 5, characterized in that: The fixing member (5) has a leakage current of no more than 2 mA for 2 seconds at a DC voltage of 1000V.

10. The top cover for preventing the injection-molded structure pole from sinking according to any one of claims 1 to 5, characterized in that: The thickness of the fixing member (5) is not less than 1.3 mm, and the thickness of the alumina insulating layer is not less than 30 μm.

Images