A cover plate and pole mounting structure and an insulation structure thereof

Abstract

The convex is arranged in the assembly hole, the penetrating hole and the inner hole of the sealing ring, the upper surface of the limiting body is arranged in close contact with the lower surface of the sealing ring, the connecting surface of the second pole body is in close contact with the upper surface of the insulating structure and the top surface of the convex, and the connecting surface is at least partially welded and fixed with the top surface of the convex, the insulating structure is provided with a sealing groove, the sealing groove of the insulating structure is filled with high-temperature-resistant sealing glue, and the upper surface and the lower surface of the high-temperature-resistant sealing glue are respectively sealed and combined with the base body and the connecting surface. The high-temperature-resistant sealing glue and the sealing ring realize double sealing, so that the sealing is more reliable, the high-temperature-resistant sealing glue adopts high-temperature-resistant A / B glue, so that the high-temperature-resistant sealing glue will not burn during the short circuit test, and the sealing of the battery top cover assembly under the short circuit test will not fail.

Description

Technical Field

[0001] This invention relates to the field of electrode structure technology for new energy vehicle batteries, and in particular to a cover plate and electrode mounting structure and its insulation structure. Background Technology

[0002] The battery terminal structure is a crucial component of the battery top cover assembly. Its primary function is to connect to and conduct electricity with the battery cells inside the battery casing. In existing technology, when installing the terminal in the mounting holes of the top cover plate, a single fluororubber sealing ring is typically used to fit the terminal into the mounting hole. Then, auxiliary mounting components are used to fix the terminal to the top cover plate via laser welding. However, this method of assembling the battery top cover assembly has the following drawbacks: 1. Currently, after the battery top cover assembly with fluororubber sealing ring is assembled into a new energy vehicle battery, it needs to undergo a short circuit test. However, the short circuit test is prone to generating high temperatures, which can easily cause the sealing ring to be burned and damaged, resulting in the failure of the seal between the top cover plate and the electrode post. 2. A single sealing ring provides a poor seal, especially under prolonged temperature changes. The sealing ring ages too quickly, leading to deformation and reduced or even failed sealing of the terminal post structure on the top cover. This seal failure can easily result in battery leakage, potentially causing a safety hazard. It can also allow dust, dirt, or other impurities to enter the battery casing. 3. The electrode posts are installed by laser welding, which causes the high heat generated during welding to act on the top cover plate, resulting in deformation of the top cover plate and poor quality of the battery top cover assembly after welding.

[0003] Therefore, based on the above-mentioned defects, there is an urgent need for a cover plate and pole mounting structure. Summary of the Invention

[0004] The purpose of this invention is to provide a cover plate and pole mounting structure and its insulation structure to overcome the shortcomings of the above-mentioned technologies.

[0005] The present invention provides an insulating structure comprising an insulating body, the insulating body comprising an inner ring and an outer ring surrounding the inner ring, the inner peripheral wall of the outer ring and the outer peripheral wall of the inner ring being connected by a connector and forming a sealing groove that is vertically connected between them, the inner ring having a through hole, and the sealing groove being used for filling with sealant.

[0006] According to the insulation structure described above, the connector is located in the middle of the sealing groove, so that there is a gap between the upper and lower surfaces of the connector and the upper and lower ports of the sealing groove, respectively. According to the insulation structure described above, the upper surface edge of the outer ring body forms positioning protrusions that are continuously or intermittently arranged.

[0007] According to the insulation structure described above, the outer wall of the positioning protrusion is formed with continuous or discontinuous protrusions.

[0008] According to the insulation structure described above, the inner side of the inner ring extends in the convex direction to form an extension ring, and the lower surface of the extension ring has an annular filler extending downward.

[0009] As another example, a cover plate and pole mounting structure includes: The substrate has mounting holes. First pole column; The second pole piece has a connecting surface; As described above, the insulating structure is fitted onto the upper surface of the substrate with an assembly hole area, and the through holes of the insulating structure are positioned corresponding to the assembly holes. The first pole piece is at least partially assembled in the assembly hole and the through hole of the insulation structure. The connecting surface of the second pole piece is in contact with the upper surface of the insulation body and the top surface of at least part of the first pole piece. The connecting surface is welded and fixed to the top surface of at least part of the first pole piece. The sealing groove in the insulation structure is filled with high-temperature resistant sealant. The upper and lower surfaces of the high-temperature resistant sealant are respectively sealed and joined with the substrate and the connecting surface.

[0010] According to the above-described cover plate and pole mounting structure, a sealing ring is also included. The sealing ring is fitted onto the lower surface of the substrate with an assembly hole area, and the inner hole of the sealing ring is corresponding to the assembly hole. The first pole piece includes a convex hull and a limiting body located on the outer periphery of the convex hull, the upper surface of the limiting body being fitted to the lower surface of the sealing ring; the convex hull is fitted into the assembly hole, the through hole of the insulating structure, and the inner hole of the sealing ring.

[0011] According to the above-described cover plate and pole post installation structure, the convex bulge and the limiting body are combined to form an integral first pole post, and the first pole post is made of aluminum; the second pole post includes a first aluminum sheet and a second aluminum sheet that are stacked and welded together, the lower surface of the first aluminum sheet is a connecting surface, and the first aluminum sheet and the second aluminum sheet are provided with corresponding injection holes.

[0012] According to the cover plate and pole mounting structure described above, the upper surface of the second aluminum sheet is provided with conductive protrusions.

[0013] According to the above-described cover plate and pole mounting structure, the second pole body is provided with an injection hole corresponding to a local position of the sealing groove. The high-temperature resistant sealant in the insulation structure is in a fluid state and is completely filled into the sealing groove after passing through the injection hole. After the high-temperature resistant sealant is cured, the upper and lower surfaces of the high-temperature resistant sealant are respectively sealed and joined with the substrate and the connecting surface.

[0014] According to the above-described cover plate and pole mounting structure, the upper surface of the substrate with the assembly hole area is formed with continuously or intermittently arranged ribs. The inner wall of the ribs and the upper surface of the substrate with the assembly hole area form a positioning space that matches the shape of the insulation structure. The insulation structure is positioned in the positioning space, and the inner wall of the positioning space abuts against the outer peripheral wall of the insulation structure.

[0015] According to the cover plate and pole mounting structure described above, the inner wall of the positioning protrusion of the insulating structure abuts against the outer peripheral wall of the second pole body.

[0016] According to the cover plate and pole mounting structure described above, the lower surface of the protrusion of the insulation structure abuts against the upper end face of the rib. According to the above-described cover plate and pole mounting structure, the annular filler of the insulating structure is placed between the inner wall of the mounting hole and the outer peripheral wall of the protrusion.

[0017] According to the cover plate and pole post mounting structure described above, connecting ears are formed on both opposite sides of the limiting body.

[0018] According to the above-described cover plate and pole mounting structure, a lower insulating member is also included. The lower insulating member is fitted onto the lower surface of the substrate. The limiting body also has locking protrusions on both sides. There is a position difference between the locking protrusions and the corresponding connecting ears, so that the locking protrusions are locked in the locking groove of the lower insulating member. The limiting body also abuts against the lower surface of the lower insulating member.

[0019] The cover plate and pole mounting structure and its insulation structure described in this invention have the following beneficial effects: 1. High-temperature resistant sealant is injected into the sealing groove, and the upper and lower surfaces of the high-temperature resistant sealant are respectively engaged with the connecting surface and the upper surface of the top cover plate to seal the upper side of the pole mounting position on the top cover plate. At the same time, a sealing ring is set between the limiting body and the lower surface of the top cover plate to seal the lower side of the pole mounting position on the top cover plate. Thus, a double seal is achieved through the high-temperature resistant sealant and the sealing ring, making the seal more reliable.

[0020] 2. The high-temperature resistant sealant uses high-temperature resistant A / B adhesive. High-temperature resistant A / B adhesive has the characteristic of high temperature resistance, so the high-temperature resistant sealant will not burn during short circuit test. Thus, the double sealing effect of the sealing ring and the high-temperature resistant A / B adhesive ensures that the sealing performance of the pole assembly into the pole hole will not fail during short circuit test.

[0021] 3. The second electrode is formed by welding the first conductive sheet and the second conductive sheet together. The first conductive sheet and the second conductive sheet are relatively thin, so a small-tonnage stamping press can be used to stamp the first conductive sheet and the second conductive sheet. The thinner thickness also makes it easier to form the first conductive sheet and the second conductive sheet, reducing the production difficulty.

[0022] 4. The first pole piece and the second pole piece are fixed by welding, which improves the fixing firmness between the first pole piece and the second pole piece and meets the connection strength requirements of welded pole pieces. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the pole mounting structure (I); Figure 2 This is a schematic diagram of the pole mounting structure (II); Figure 3 Here is a schematic diagram of the structure of the insulating body (I); Figure 4 This is a schematic diagram of the structure of the insulating body (II); Figure 5 This is an exploded view of the insulating body; Figure 6 This is a schematic diagram of the structure of the first pole piece (I); Figure 7 This is a schematic diagram of the structure of the first pole piece (II); Figure 8 This is a schematic diagram of the pole mounting structure (III); Figure 9 This is a schematic diagram of the pole mounting structure (IV); Figure 10 This is an exploded view of the pole mounting structure (I); Figure 11 This is an exploded view (II) of the pole mounting structure; Figure 12 This is a schematic diagram of the insulation structure.

[0024] Reference numerals: 1. Base; 11. Assembly hole; 12. Rib; 2. First pole post; 21. Protrusion; 211. Cavity; 22. Limiting body; 23. Connecting ear; 24. Locking protrusion; 3. Second pole post; 31. First aluminum sheet; 32. Second aluminum sheet; 311. Connecting surface; 321. Conductive protrusion; 4. Insulating body; 41. Outer ring; 42. Inner ring; 43. Sealing groove; 44. Connecting body; 411. Positioning protrusion; 412. Protrusion; 421. Extension ring; 422. Annular filler; 423. Through hole; 5. High-temperature resistant sealant; 6. Sealing ring; 7. Lower insulating component; 71. Limiting groove; 711. Locking groove; 712. Limiting protrusion; 713. Concave; 8. Injection hole; 9. Angled. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0026] Example 1: like Figures 1-5 and Figure 12 As shown, the insulating structure described in this embodiment includes an insulating body 4, which includes an inner ring 42 and an outer ring 41 surrounding the inner ring 42. The inner peripheral wall of the outer ring 41 is connected to the outer peripheral wall of the inner ring 42 by a connector 44, and a sealing groove 43 is formed between them in a vertically through manner. A through hole 423 is formed on the inner ring 42, and the sealing groove 43 is used for filling with sealant. The connector, the inner ring, and the outer ring are combined to form an integral insulating body made of plastic material.

[0027] Preferably, the connector 44 is located in the middle of the sealing groove 43, so that there is a gap between the upper surface and the lower surface of the connector 44 and the upper port and the lower port of the sealing groove 43, respectively. The structure is designed so that the sealant is filled in the sealing groove, and the sealant is exposed at the upper port and the lower port of the sealing groove.

[0028] Preferably, the upper surface edge of the outer ring body 41 forms a continuous or discontinuous positioning protrusion 411, and the outer wall of the positioning protrusion 411 forms a continuous or discontinuous protrusion 412. The inner side of the inner ring body 42 extends towards the protrusion 21 to form an extension ring 421, and the lower surface of the extension ring 421 extends towards the lower limiting body 22 with an annular filler 422. This structural design makes the fit of the insulation structure on the top cover plate more suitable, makes it easier to position the pole, and makes it easier to position the insulation structure on the top cover plate.

[0029] Example 2: Figures 1-11 As shown in the figure, the cover plate and pole mounting structure described in this embodiment includes a base 1, a first pole 2, a second pole 3, an insulating body 4, and a sealing ring 6. The base 1 is provided with an assembly hole 11. The base 1 is generally a metal plate, and preferably made of aluminum. The first pole 2 includes a protrusion 21 and a limiting body 22 located on the outer periphery of the protrusion 21. The protrusion 21 has a cavity 211. The second pole 3 is provided with a connecting surface 311. The second pole 3 is also made of metal. The insulating body 4 is fitted onto the upper surface of the base 1 in the area with the assembly hole 11. The insulating body 4 of the insulating structure includes an inner ring 42 and an outer ring surrounding the inner ring 42. The outer ring body 41 and the inner ring body 42 are connected by a connector 44, forming a vertically through sealing groove 43 between them. The inner ring body 42 has a through hole 423 corresponding to the position of the assembly hole 11. The outer ring body 41, the inner ring body 42 and the connector 44 are combined to form an integral insulating body 4. The outer ring body 41, the inner ring body 42 and the connector 44 are all made of plastic, and the sealing groove 43 is annular. The sealing ring 6 is fitted onto the lower surface of the base 1 with the assembly hole 11 area. The inner hole of the sealing ring 6 corresponds to the assembly hole 11. The sealing ring 6 is made of fluororubber.

[0030] The convex bulge 21 is inserted into the assembly hole 11, the through hole 423 and the inner hole of the sealing ring 6. The upper surface of the limiting body 22 is fitted with the lower surface of the sealing ring 6. The connecting surface 311 of the second pole body 3 is fitted with the upper surface of the insulating body 4 and the top surface of the convex bulge 21. The connecting surface 311 is at least partially welded and fixed to the top surface of the convex bulge 21. The sealing groove 43 is filled with high-temperature resistant sealant 5. The upper and lower surfaces of the high-temperature resistant sealant 5 are respectively sealed and joined with the base body 1 and the connecting surface 311.

[0031] Preferably, the second electrode post 3 is provided with injection holes 8 corresponding to local positions of the sealing groove 43. The high-temperature resistant sealant 5, in a fluid state, completely fills the sealing groove 43 after passing through the injection holes 8. After the high-temperature resistant sealant 5 cures, its upper and lower surfaces are respectively sealed and bonded to the substrate 1 and the connecting surface 311. Multiple injection holes 8 can be used to improve the efficiency of injecting the high-temperature resistant sealant 5. Generally, the high-temperature resistant sealant 5 uses a high-temperature resistant A / B adhesive specifically designed for the automotive manufacturing industry. This high-temperature resistant A / B adhesive has high-temperature resistance and will not burn. Through the dual sealing effect of the sealing ring 6 and the high-temperature resistant A / B adhesive, the sealing performance of the electrode post assembled into the assembly hole is ensured to remain intact during short-circuit testing.

[0032] In this embodiment, the convex hull 21 and the limiting body 22 are combined to form an integral structure of the first pole post 2, and the first pole post 2 is made of aluminum or copper. The second pole post 3 includes a first aluminum sheet 31 and a second aluminum sheet 32 ​​that are stacked and welded together. The lower surface of the first aluminum sheet 31 is a connecting surface 311. The first aluminum sheet 31 and the second aluminum sheet 32 ​​are provided with corresponding injection holes 8. The welding method between the first aluminum sheet 31 and the second aluminum sheet 32, and the welding method between the first aluminum sheet 31 and the top of the convex hull 21, are both ultrasonic welding or laser welding. The welding energy during welding is applied to the top inner wall of the cavity 211 after passing through the cavity 211, thereby performing ultrasonic energy or laser energy penetration welding. Furthermore, the upper surface of the second aluminum sheet 32 ​​is provided with a conductive protrusion 321, which facilitates the conductive connection of the battery's electronic control system.

[0033] In this embodiment, the upper surface of the substrate 1 with the assembly hole 11 area is formed with continuously or intermittently arranged protruding ribs 12. The continuously arranged protruding ribs 12 are annular protruding ribs 12, and the intermittently arranged protruding ribs 12 are multiple protruding ribs 12 spaced apart from each other and arranged in annular. The inner wall of the protruding ribs 12 and the upper surface of the substrate 1 with the assembly hole 11 area form a positioning space that is adapted to the shape of the insulating body 4. The insulating body 4 is positioned in the positioning space, and the inner wall of the positioning space abuts against the outer peripheral wall of the insulating body 4. The protruding ribs 12 can strengthen the strength of the substrate 1 so that the deformation of the substrate 1 after the new energy vehicle battery equipped with the battery top cover assembly of the present invention is small after inflation, and at the same time, it positions the insulating body 4.

[0034] In this embodiment, the upper surface edge of the outer ring body 41 forms a continuous or discontinuous positioning protrusion 411. The continuous positioning protrusion 411 is a ring-shaped positioning protrusion 411, and the discontinuous positioning protrusion 411 consists of multiple positioning protrusions 411 spaced apart from each other and arranged in a ring. The inner wall of the positioning protrusion 411 abuts against the outer peripheral wall of the second pole body 3. Its structure is mainly used to position the second pole body 3.

[0035] Preferably, the continuous or intermittent ribs 12, the outer ring body 41, and the continuous or intermittent positioning protrusions 411 are all square in shape, so that after the insulating body 4 is positioned in the positioning space and the second pole body 3 is positioned in the space formed by the positioning protrusions 411, the oblique angle 9 of the second pole body 3 is correspondingly matched with the oblique angle 9 of the space formed by the positioning protrusions 411, and the oblique angle 9 of the positioning space is correspondingly matched with the oblique angle 9 on the outer ring body 41, thereby preventing the pole body and the insulating body 4 from rotating after assembly.

[0036] In a further preferred embodiment, the outer wall of the positioning protrusion 411 is formed with continuous or intermittently arranged protrusions 412. The lower surface of the protrusions 412 abuts against the upper end surface of the rib 12. The continuously arranged protrusions 412 are annular protrusions 412, and the intermittently arranged protrusions 412 are multiple protrusions 412 spaced apart from each other and arranged in annular shape. The structure covers the rib 12 to protect it.

[0037] Furthermore, the inner side of the inner ring body 42 extends towards the convex 21 to form an extension ring 421. The lower surface of the extension ring 421 extends towards the lower limiting body 22 with an annular filler 422. The annular filler 422 is placed between the inner wall of the assembly hole 11 and the outer peripheral wall of the convex 21. Its structural design makes the positioning of the insulating body 4 more reliable and improves the compactness and stability of the pole after installation.

[0038] In this embodiment, connecting ears 23 are formed on both sides of the limiting body 22. The connecting ears 23 are mainly welded and fixed to the electrode tabs of the battery cell. The connecting ears 23 and the limiting body 22 are combined into an integral structure, which makes it easier to weld to the electrode tabs of the battery cell, simplifies the electrode tab welding process, and improves the efficiency of assembling the battery top cover onto the battery.

[0039] In this embodiment, a lower insulating member 7 is also included. The lower insulating member 7 is fitted onto the lower surface of the base 1 and welded to it. The limiting body 22 also has locking protrusions 24 on both opposite sides. There is a positional difference between the locking protrusions 24 and the corresponding connecting ears 23, so that the locking protrusions 24 are locked in the locking grooves 711 of the lower insulating member 7. The limiting body 22 also abuts against the lower surface of the lower insulating member 7. This structural design provides more reliable insulation between the limiting body 22 and the base 1. The timing protrusion 24 is positioned within the timing groove 711 of the lower insulating member 7, making the second pole piece 3 more stably mounted on the base 1. The timing protrusion 24 is radially positioned on the limiting body 22, and the limiting body 22 is placed within the limiting groove 71 on the lower surface of the lower insulating member 7. The limiting groove 71 has limiting protrusions 712 opposite to the two inner walls. The outer part of the limiting body 22 is recessed into the inner recess 713 of the limiting protrusion 712. The timing groove 711 also has radially positioned timing grooves 711 opposite to the two inner walls.

Claims

1. An insulating structure, characterized by, The insulating body (4) includes an inner ring (42) and an outer ring (41) surrounding the inner ring (42). The inner peripheral wall of the outer ring (41) is connected to the outer peripheral wall of the inner ring (42) by a connector (44), and a sealing groove (43) is formed between them in a vertically through manner. A through hole (423) is formed on the inner ring (42), and the sealing groove (43) is used for filling with sealant.

2. The insulating structure of claim 1, wherein The connector (44) is located in the middle of the sealing groove (43) so that there is a gap between the upper and lower surfaces of the connector (44) and the upper and lower ports of the sealing groove (43), respectively.

3. The insulating structure of claim 1, wherein The upper surface edge of the outer ring (41) forms a continuous or discontinuous positioning protrusion (411).

4. The insulation structure according to claim 3, characterized in that, The outer wall of the positioning protrusion (411) is formed with continuous or discontinuous protrusions (412).

5. The insulation structure according to claim 4, characterized in that, The inner ring (42) extends towards the convex hull (21) to form an extension ring (421), and the lower surface of the extension ring (421) has an annular filler (422) extending downward.

6. A cover plate and pole post mounting structure, characterized in that, include: The substrate (1) is provided with mounting holes (11); First pole piece (2); The second pole post (3) is provided with a connecting surface (311); The insulating structure as described in any one of claims 1-5 is attached to the upper surface of the substrate (1) having an assembly hole (11) area, and the through hole (423) of the insulating structure is provided in a position corresponding to the assembly hole (11); The first pole piece (2) is at least partially assembled in the assembly hole (11) and the through hole (423) of the insulation structure. The connecting surface (311) of the second pole piece (3) is in contact with the upper surface of the insulation body (4) and at least part of the top surface of the first pole piece (2). The connecting surface (311) is at least partially welded and fixed to the top surface of the first pole piece (2). The sealing groove (43) of the insulation structure is filled with high-temperature resistant sealant (5). The upper and lower surfaces of the high-temperature resistant sealant (5) are respectively sealed and joined with the substrate (1) and the connecting surface (311).

7. The cover plate and pole post mounting structure according to claim 6, characterized in that, It also includes a sealing ring (6), which is fitted onto the lower surface of the substrate (1) having an assembly hole (11) area, and the inner hole of the sealing ring (6) is correspondingly provided with the assembly hole (11); The first pole piece (2) includes a convex hull (21) and a limiting body (22) located on the outer periphery of the convex hull (21). The upper surface of the limiting body (22) is fitted to the lower surface of the sealing ring (6). The convex hull (21) is assembled in the assembly hole (11), the through hole (423) of the insulating structure and the inner hole of the sealing ring (6).

8. The cover plate and pole post mounting structure according to claim 7, characterized in that, The convex hull (21) and the limiting body (22) are combined to form an integral structure of the first pole post (2), and the first pole post (2) is made of aluminum. The second pole post (3) includes a first aluminum sheet (31) and a second aluminum sheet (32) that are stacked and welded together. The lower surface of the first aluminum sheet (31) is a connecting surface (311). The first aluminum sheet (31) and the second aluminum sheet (32) are provided with corresponding injection holes (8).

9. The cover plate and pole post mounting structure according to claim 8, characterized in that, The upper surface of the second aluminum sheet (32) is provided with conductive protrusions (321).

10. The cover plate and pole post mounting structure according to claim 6, characterized in that, The second pole piece (3) is provided with an injection hole (8) corresponding to a local position of the sealing groove (43). The high temperature resistant sealant (5) in the insulating structure is in a fluid state and is completely filled into the sealing groove (43) after passing through the injection hole (8). After the high temperature resistant sealant (5) is cured, the upper and lower surfaces of the high temperature resistant sealant (5) are respectively sealed and joined with the substrate (1) and the connecting surface (311).

11. The cover plate and pole post mounting structure according to claim 7, characterized in that, The upper surface of the substrate (1) having the assembly hole (11) area is provided with continuous or intermittently arranged ribs (12). The inner wall of the ribs (12) and the upper surface of the substrate (1) having the assembly hole (11) area form a positioning space that is adapted to the shape of the insulating structure. The insulating structure is positioned in the positioning space, and the inner wall of the positioning space abuts against the outer peripheral wall of the insulating structure.

12. The cover plate and pole post mounting structure according to claim 11, characterized in that, The inner wall of the positioning protrusion (411) of the insulating structure abuts against the outer peripheral wall of the second pole piece (3).

13. The cover plate and pole post mounting structure according to claim 11, characterized in that, The lower surface of the protrusion (412) of the insulating structure abuts against the upper end surface of the rib (12).

14. The cover plate and pole post mounting structure according to claim 11, characterized in that, The annular filler (422) of the insulating structure is placed between the inner wall of the assembly hole (11) and the outer peripheral wall of the bulge (21).

15. The cover plate and pole post mounting structure according to claim 7, characterized in that, Connecting ears (23) are formed on both opposite sides of the limiting body (22).

16. The cover plate and pole post mounting structure according to claim 15, characterized in that, It also includes a lower insulating member (7), which is attached to the lower surface of the substrate (1). The limiting body (22) has locking protrusions (24) on both sides. There is a position difference between the locking protrusions (24) and the corresponding connecting ears (23) so that the locking protrusions (24) are locked in the locking groove (711) of the lower insulating member (7). The limiting body (22) also abuts against the lower surface of the lower insulating member (7).

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