Secondary battery top cover assembly

Abstract

The invention discloses a secondary battery top cover assembly, which comprises a top cover plate, a pole, an insulation sealing ring and a pressing block, the top cover plate is provided with a through hole part, and the hole wall of the through hole part is provided with a trumpet-shaped first inclined surface extending upwards; the pole comprises a main body part and a flange, and the insulating sealing ring sleeves the main body part and is attached to the upper surface of the flange; the main body part is arranged in the through hole part in a penetrating manner, and the through hole part is propped against the insulating sealing ring and forms a first mounting gap between the first inclined surface and the side surface of the main body part; and the pressing block is fixedly connected with the main body part, the outer side surface of the pressing block is provided with a second inclined surface and a first connecting surface, the inner side surface of the pressing block is arranged corresponding to the side surface of the main body part so that the pressing block is embedded in the first mounting gap and pressed on the upper surface of the through hole part, and the pressing block is matched with the insulating sealing ring so that the top cover plate is insulated from the pole. According to the invention, the top cover plate, the pole, the insulation sealing ring and the pressing block are directly pressed together, so that the sealing performance is good, and the service life is longer.

Description

Technical Field

[0001] This invention relates to the field of energy storage devices, and more particularly to a secondary battery top cover assembly. Background Technology

[0002] Currently, most power batteries adopt a rigid-shell structure. The power battery casing includes a housing and a top cover assembly. The housing provides a sealed space to house the electrode assembly and electrolyte. The electrical energy of the electrode assembly is led out from the inside of the housing to the outside through the terminals of the top cover assembly. Existing top cover assemblies typically include a top cover plate with through holes through which the terminals pass. The terminals are connected and sealed to the top cover plate with injection-molded insulating adhesive. However, top cover plates using injection-molded insulating adhesive have poor sealing performance and service life. Summary of the Invention

[0003] The purpose of this invention is to provide a secondary battery top cover assembly to solve the problems of poor sealing performance and service life of the top cover plate in the prior art.

[0004] To achieve the above objectives, the present invention provides a secondary battery top cover assembly, comprising a top cover plate, a terminal post, an insulating sealing ring, and a pressure block. The top cover plate has a through hole, the wall of which has an upwardly extending, trumpet-shaped first inclined surface. The terminal post includes a main body and a flange surrounding the outer periphery of the main body. The insulating sealing ring is fitted onto the main body and conforms to the upper surface of the flange and the side surface of the main body. The main body passes through the through hole, and the through hole abuts against the insulating sealing ring. A first installation gap is formed between the first inclined surface and the side surface of the main body; the pressure block is fixedly connected to the main body, the pressure block is annular, the outer side surface of the pressure block is provided with a second inclined surface that cooperates with the first inclined surface and a first connecting surface that cooperates with the upper surface of the through hole, and the inner side surface of the pressure block is provided corresponding to the side surface of the main body, so that the pressure block is embedded in the first installation gap and pressed against the upper surface of the through hole, and the pressure block and the insulating sealing ring cooperate with each other to insulate the top cover plate from the pole.

[0005] Preferably, the opening of the first mounting gap gradually increases from bottom to top, and the pressure block includes a wedge-shaped portion having a second inclined surface, the wedge-shaped portion being embedded in the first mounting gap.

[0006] Preferably, the pressing block includes a plastic block and a metal block, both of which are annular. The outer side of the plastic block is provided with a second inclined surface and a first connecting surface, and the inner side of the metal block is provided corresponding to the side of the main body.

[0007] Preferably, the inner side of the plastic block has an upwardly extending, trumpet-shaped third inclined surface, and a second mounting gap is formed between the third inclined surface and the side of the main body. The outer side of the metal block is provided with a fourth inclined surface that cooperates with the third inclined surface and a second connecting surface that cooperates with the upper surface of the plastic block so that the metal block is embedded in the second mounting gap and pressed onto the upper surface of the plastic block. The metal block is welded to the main body, riveted to it, or bonded to it with adhesive.

[0008] Preferably, the pressure block includes a first insulating part, the outer side of the first insulating part is provided with a second inclined surface and a first connecting surface, the inner side of the first insulating part is provided with a first metal layer, the first metal layer is disposed corresponding to the side of the main body and welded to the side of the main body, or the first metal layer is disposed corresponding to the side of the main body and bonded to the side of the main body with adhesive.

[0009] Preferably, the first insulating part is made of ceramic.

[0010] Preferably, the pressure block includes a second insulating part, the outer side of the second insulating part is provided with a second inclined surface and a first connecting surface, the inner side of the second insulating part is provided corresponding to the side of the main body, the upper surface of the second insulating part is provided with a second metal layer, the second metal layer is welded to the side of the main body or the second metal layer and the inner side of the second insulating part are bonded to the side of the main body by adhesive.

[0011] Preferably, the material of the second insulating part is ceramic.

[0012] Preferably, a fifth inclined surface is provided on the main body of the pole at the position where it connects with the flange. The fifth inclined surface is an annular surface that slopes inward from bottom to top. A sixth inclined surface is provided on the inner side of the insulating sealing ring corresponding to the fifth inclined surface so that the insulating sealing ring is fitted onto the fifth inclined surface.

[0013] Preferably, the outer side of the insulating sealing ring is provided with a seventh inclined surface, which is an inwardly inclined annular surface from bottom to top, and the lower part of the hole wall of the through hole is provided with an eighth inclined surface corresponding to the seventh inclined surface so that the through hole abuts against the insulating sealing ring.

[0014] Compared with the prior art, the secondary battery top cover assembly of the present invention has good sealing performance and longer service life by setting a top cover plate, terminal post, insulating sealing ring and pressure block and directly pressing the top cover plate, terminal post, insulating sealing ring and pressure block together. In addition, the second inclined surface of the pressure block and the inner surface of the pressure block can form a wedge shape. During assembly, the pressure block can be naturally guided along the first inclined surface, forming precise positioning, which facilitates assembly and further ensures the sealing performance between the terminal post and the top cover plate. The design is very ingenious. Attached Figure Description

[0015] Figure 1 This is a structural diagram of a secondary battery top cover assembly according to an embodiment of the present invention.

[0016] Figure 2 This is a structural diagram of the top cover plate in an embodiment of the present invention.

[0017] Figure 3 for Figure 2 Cross-sectional structural diagram.

[0018] Figure 4 This is a structural diagram of the pole in an embodiment of the present invention.

[0019] Figure 5 This is a structural diagram of the top cover plate, pole post, and insulating sealing ring after installation in an embodiment of the present invention.

[0020] Figure 6 In order to be in Figure 5 The structural diagram shows the structure after the plastic blocks are installed.

[0021] Figure 7 for Figure 1 Cross-sectional structural diagram.

[0022] Figure 8 This is another structural diagram of the secondary battery top cover assembly according to an embodiment of the present invention.

[0023] Figure 9 for Figure 8 Cross-sectional structural diagram.

[0024] Figure 10 This is another structural diagram of the secondary battery top cover assembly according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached diagram: 10. Secondary battery top cover assembly; 1. Top cover plate; 11. Through hole; 111. First inclined surface; 112. Eighth inclined surface; 2. Terminal post; 20. First mounting gap; 200. Second mounting gap; 21. Main body; 211. Fifth inclined surface; 22. Flange; 3. Insulating sealing ring; 31. First sealing part; 32. Second sealing part; 321. Sixth inclined surface; 322. Seventh inclined surface; 33. Third sealing part; 4. Pressing block; 401. First connecting surface; 402. Second inclined surface; 41. Plastic block; 411. First plastic connecting part; 4111. Clip 412. Step; 412. Second plastic connecting part; 4121. Third inclined surface; 413. Third plastic connecting part; 42. Metal block; 421. First metal connecting part; 4211. Second connecting surface; 422. Second metal connecting part; 4221. Fourth inclined surface; 410. First insulating part; 4101. First insulating connecting part; 4102. Second insulating connecting part; 420. First metal layer; 4100. Second insulating part; 41001. Third insulating connecting part; 41002. Fourth insulating connecting part; 4200. Second metal layer; 5. Lower plastic body. Detailed Implementation

[0026] To illustrate the technical content, structural features, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0027] Example 1 like Figures 1 to 7As shown, this embodiment of the invention provides a secondary battery top cover assembly, including a top cover plate 1, a terminal post 2, an insulating sealing ring 3, and a pressure block 4. The top cover plate 1 has a through hole 11, and the wall of the through hole 11 has an upwardly extending, trumpet-shaped first inclined surface 111. The terminal post 2 includes a main body 21 and a flange 22 surrounding the outer periphery of the main body 21. The insulating sealing ring 3 is sleeved on the main body 21 and fits against the upper surface of the flange 22 and the side surface of the main body 21. The main body 21 passes through the through hole 11, and the through hole 11 abuts against the insulating sealing ring 4. A first mounting gap 20 is formed between the first inclined surface 111 and the side surface of the main body 21 on the ring 3; the pressure block 4 is fixedly connected to the main body 21. The pressure block 4 is ring-shaped. The outer side of the pressure block 4 is provided with a second inclined surface 402 that cooperates with the first inclined surface 111 and a first connecting surface 401 that cooperates with the upper surface of the through hole 11. The inner side of the pressure block 4 is provided corresponding to the side surface of the main body 21, so that the pressure block 4 is embedded in the first mounting gap 20 and pressed against the upper surface of the through hole 11. The pressure block 4 and the insulating sealing ring 3 cooperate with each other to insulate the top cover plate 1 and the pole post 2. Specifically, the through-hole portion 11 has a through hole for leading out an electrode. The upper surface of the through-hole portion 11 can protrude beyond the upper surface of other areas of the top cover plate 1. The first inclined surface 111 extends upward to the upper surface of the through-hole portion 11. The angle between the first inclined surface 111 and the horizontal plane is greater than or equal to 30 degrees and less than or equal to 60 degrees. The pressure block 4, by providing the first connecting surface 401 and the second inclined surface 402, can press the top cover plate 1 downward and towards the first inclined surface 111, thereby pressing the insulating sealing ring 3. The electrode post 2 has good sealing performance. In addition, the main body 21 of the electrode post 2 is columnar, and the opening of the first installation gap 20 can gradually increase from bottom to top. The pressure block 4 includes a wedge-shaped part with a second inclined surface 402. The wedge-shaped part is embedded in the first installation gap 20. That is, the second inclined surface 402 of the pressure block 4 and the inner side surface of the pressure block 4 can form a wedge shape. During assembly, the pressure block 4 can be naturally guided along the first inclined surface 111 to form accurate positioning, facilitate assembly, and further ensure the sealing performance between the electrode post 2 and the top cover plate 1.

[0028] The secondary battery top cover assembly 10 of this invention sets up a top cover plate 1, a terminal post 2, an insulating sealing ring 3, and a pressing block 4, and directly presses the top cover plate 1, terminal post 2, insulating sealing ring 3, and pressing block 4 together, resulting in good sealing performance and a longer service life. In addition, the second inclined surface 402 of the pressing block 4 and the inner surface of the pressing block 4 can form a wedge shape. During assembly, the pressing block 4 can be naturally guided along the first inclined surface 111, resulting in accurate positioning, facilitating assembly, and further ensuring the sealing performance between the terminal post 2 and the top cover plate 1. The design is very ingenious.

[0029] In this embodiment of the invention, the pressing block 4 includes a plastic block 41 and a metal block 42, both of which are annular. The outer side of the plastic block 41 is provided with a second inclined surface 402 and a first connecting surface 401, and the inner side of the metal block 42 is provided corresponding to the side of the main body 21. Specifically, as shown... Figures 1 to 7 As shown, by using the pressure block 4, which is composed of interconnected plastic blocks 41 and metal blocks 42, the insulation between the pole post 2 and the top cover plate 1 is ensured, and the metal blocks 42 are used to fix the pole post 2, effectively ensuring the connection and sealing effect between the top cover plate 1, pole post 2, insulating sealing ring 3 and pressure block 4.

[0030] Furthermore, the inner side of the plastic block 41 has an upwardly extending, trumpet-shaped third inclined surface 4121, forming a second mounting gap 200 between the third inclined surface 4121 and the side of the main body 21. The outer side of the metal block 42 has a fourth inclined surface 4221 that mates with the third inclined surface 4121 and a second connecting surface 4211 that mates with the upper surface of the plastic block 41, so that the metal block 42 is embedded in the second mounting gap 200 and pressed onto the upper surface of the plastic block 41. The metal block 42 is welded, riveted, or glued to the main body 21. Specifically, as shown... Figures 6 to 7As shown, the plastic block 41 includes a first plastic connecting part 411, a second plastic connecting part 412, and a third plastic connecting part 413 connected in sequence. The first plastic connecting part 411, the second plastic connecting part 412, and the third plastic connecting part 413 are all annular. The side of the first plastic connecting part 411 facing the top cover plate 1 is the first connecting surface 401. The side of the second plastic connecting part 412 facing the top cover plate 1 is the second inclined surface 402. The third plastic connecting part 413 abuts against the side of the main body 21 of the pole post 2, and the third plastic connecting part 413 and the insulating sealing ring 3 are spaced apart or abut against each other. The first plastic connecting part 411 is pressed onto the upper surface of the through hole 11, the second plastic connecting part 412 is pressed onto the first inclined surface 111, and the side of the second plastic connecting part 412 away from the top cover plate 1 is the third inclined surface 4121. In addition, the metal block 42 includes an annular first metal connecting portion 421 and an annular second metal connecting portion 422. The side of the first metal connecting portion 421 facing the plastic block 41 is the second connecting surface 4211, and the side of the second metal connecting portion 422 facing the plastic block 41 is the fourth inclined surface 4221. The fourth inclined surface 4221 and the inner surface of the metal block 42 can form a wedge shape. During assembly, the metal block 42 can be naturally guided along the third inclined surface 4121, resulting in precise positioning, facilitating assembly, and further ensuring the sealing performance between the pole post 2 and the top cover plate 1. The design is ingenious. After block 42 is embedded in the second installation gap 200 and pressed onto the upper surface of plastic block 41, the top cover plate 1, insulating sealing ring 3, pressing block 4 and pole post 2 are tightly sealed and connected by welding at the connection position of metal block 42 and pole post 2 using laser or other methods. In this embodiment of the invention, the second plastic connecting part 412 and the second metal connecting part 422 form a wedge-shaped part. It should be noted that the plastic block 41 and the through hole part 11 and the plastic block 41 and the metal block 42 can also be connected by adhesive. The adhesive can be selected as having good sealing and adhesion properties.

[0031] Furthermore, such as Figures 6 to 7 As shown, the upper part of the plastic block 41 is also provided with a snap-fit ​​step 4111, and the part of the metal block 42 that is pressed against the upper surface of the plastic block 41 abuts against the snap-fit ​​step 4111. Specifically, by setting the snap-fit ​​step 4111, the metal block 42 and the plastic block 41 are ensured to be more tightly connected and the connection effect is better.

[0032] In this embodiment of the invention, a fifth inclined surface 211 is provided on the main body 21 of the pole post 2 at the position where it connects with the flange 22. The fifth inclined surface 211 is an inwardly inclined annular surface from bottom to top. A sixth inclined surface 321 is provided on the inner side of the insulating sealing ring 3 corresponding to the fifth inclined surface 211 so that the insulating sealing ring 3 is fitted onto the fifth inclined surface 211. Specifically, as shown in the figure... Figures 4 to 5As shown, the insulating sealing ring 3 includes a first sealing part 31, a second sealing part 32, and a third sealing part 33 connected in sequence. The inner side of the second sealing part 32 is a sixth inclined surface 321. The first sealing part 31 is attached to the upper surface of the flange 22, the second sealing part 32 is attached to the fifth inclined surface 211, and the third sealing part 33 is attached to the side of the main body 21, thereby isolating the pole post 2 from the top cover plate 1.

[0033] Furthermore, such as Figure 5 As shown, the outer surface of the insulating sealing ring 3 is provided with a seventh inclined surface 322. The seventh inclined surface 322 is an inwardly inclined annular surface from bottom to top. The lower part of the through hole 11 is provided with an eighth inclined surface 112 corresponding to the seventh inclined surface 322 so that the through hole 11 abuts against the insulating sealing ring 3. Specifically, the outer surface of the second sealing part 32 is the seventh inclined surface 322, the lower surface of the through hole 11 abuts against the first sealing part 31, and the eighth inclined surface 112 of the through hole 11 abuts against the seventh inclined surface 322. The fifth inclined surface 211, the sixth inclined surface 321, the seventh inclined surface 322 and the eighth inclined surface 112 are parallel or approximately parallel to each other, ensuring better sealing between the pole post 2, the insulating sealing ring 3 and the top cover plate 1.

[0034] In embodiments of the present invention, such as Figure 7 As shown, a lower plastic body 5 is also attached to the upper surface of the flange 22 to insulate the flange 22 from the top cover plate 1.

[0035] Example 2 The difference between this embodiment and Embodiment 1 is that the forming method of the pressing block 4 in this embodiment is different from that in Embodiment 1, such as... Figures 8 to 9As shown, the pressure block 4 in this embodiment includes a first insulating part 410. The outer side of the first insulating part 410 is provided with a second inclined surface 402 and a first connecting surface 401. The inner side of the first insulating part 410 is provided with a first metal layer 420. The first metal layer 420 is disposed on the side of the main body 21 and welded to the side of the main body 21, or the first metal layer 420 is disposed on the side of the main body 21 and bonded to the side of the main body 21 with glue. Specifically, the first insulating part 410 can be made of ceramic to ensure its insulating performance. The first insulating part 410 includes an annular first insulating connecting part 4101 and a second insulating connecting part 4102 connected to each other. The first insulating connecting part 4101 is located above the second insulating connecting part 4102. The lower surface of the first insulating connecting part 4101 has a first connecting surface 401. The side of the second insulating connecting part 4102 facing the through hole 11 is a second inclined surface 402. The inner surfaces of the second insulating connecting part 4102 and the first insulating connecting part 4101 are coated with a first metal layer 42 by processes such as spraying or deposition. 0. The first metal layer 420 can be made of aluminum, allowing it to be welded to the aluminum pole 2 at the connection point. The lower part of the first metal layer 420 and the second insulating connection part 4102 form a wedge shape. The lower part of the first metal layer 420 and the second insulating connection part 4102 are embedded in the first installation gap 20, and the first insulating connection part 4101 is pressed against the upper surface of the through hole part 11. That is, a wedge shape is formed between the first metal layer 420 and the second inclined surface 402, allowing the pressure block 4 to be naturally guided along the first inclined surface 111, resulting in precise positioning, easy assembly, and further ensuring the sealing performance between the pole 2 and the top cover plate 1. It should be noted that the material of the first metal layer 420 can be selected according to the material of the pole 2, as long as it is a material that is conducive to welding, there is no restriction here. In addition, the first insulating part 410 and the through hole part 11 can also be bonded together with adhesive.

[0036] Example 3 The difference between this embodiment and Embodiment 1 is that the forming method of the pressing block 4 in this embodiment is different from that in Embodiment 1, such as... Figure 10As shown, the pressure block 4 in this embodiment includes a second insulating part 4100. The outer side of the second insulating part 4100 is provided with a second inclined surface 402 and a first connecting surface 401. The inner side of the second insulating part 4100 is provided corresponding to the side of the main body part 21. The upper surface of the second insulating part 4100 is provided with a second metal layer 4200. The second metal layer 4200 is welded to the side of the main body part 21 or the second metal layer 4200 and the inner side of the second insulating part 4100 are bonded to the side of the main body part 21 by adhesive. Specifically, the second insulating part 4100 can be made of ceramic to ensure its insulating performance. The second insulating part 4100 includes annular third insulating connecting part 41001 and fourth insulating connecting part 41002 connected to each other. The third insulating connecting part 41001 is located above the fourth insulating connecting part 41002. The lower surface of the third insulating connecting part 41001 has a first connecting surface 401. The side of the fourth insulating connecting part 41002 facing the through hole 11 has a second inclined surface 402. The third insulating connecting part 41001... A second metal layer 4200 is formed on the upper surface through processes such as spraying or deposition. The material of the second metal layer 4200 can be aluminum, allowing it to be welded to the aluminum pole 2 at the connection point. The fourth insulating connection part 41002 is embedded in the first mounting gap 20, and the third insulating connection part 41001 is pressed onto the upper surface of the through hole part 11. The fourth insulating connection part 41002 forms a wedge shape, allowing the pressure block 4 to be naturally guided along the first inclined surface 111, resulting in precise positioning, facilitating assembly, and further ensuring the sealing performance between the pole 2 and the top cover plate 1. It should be noted that the material of the second metal layer 4200 can be selected according to the material of the pole 2, as long as it is a material that facilitates welding. There are no restrictions here. In addition, the second insulating part 4100 and the through hole part 11 can also be bonded together with adhesive.

[0037] The above-disclosed examples are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention shall still fall within the scope of the present invention.

Claims

1. A secondary battery top cover assembly, characterized by: The top cover plate, the pole, the insulation sealing ring and the pressing block are included, the top cover plate is equipped with the through hole part, the hole wall of the through hole part has the first slope which extends upwards and is trumpet-shaped; The pole includes the main body part and the flange which is arranged around the outer periphery of the main body part, the insulation sealing ring is sleeved on the main body part and is attached to the upper surface of the flange and the side surface of the main body part; the main body part is arranged in the through hole part, and the through hole part is in contact with the insulation sealing ring and forms the first installation gap between the first slope and the side surface of the main body part; The pressing block is fixedly connected with the main body part, the pressing block is annular, the outer side surface of the pressing block is provided with the second slope which cooperates with the first slope and the first connecting surface which cooperates with the upper surface of the through hole part, and the inner side surface of the pressing block is arranged corresponding to the side surface of the main body part, so that the pressing block is embedded in the first installation gap and is pressed on the upper surface of the through hole part, and the pressing block and the insulation sealing ring cooperate with each other to insulate the top cover plate from the pole.

2. The secondary battery top cover assembly of claim 1, wherein: The opening of the first installation gap gradually increases from bottom to top, and the pressing block includes a wedge-shaped part having the second slope, and the wedge-shaped part is embedded in the first installation gap.

3. The secondary battery top cover assembly of claim 1, wherein: The pressing block includes a plastic block and a metal block, the plastic block and the metal block are annular, the outer side surface of the plastic block is provided with the second slope and the first connecting surface, and the inner side surface of the metal block is arranged corresponding to the side surface of the main body part.

4. The secondary battery top cover assembly of claim 3, wherein: The inner side surface of the plastic block has a third slope which extends upwards and is trumpet-shaped, the third slope and the side surface of the main body part form a second installation gap, the outer side surface of the metal block is provided with a fourth slope which cooperates with the third slope and a second connecting surface which cooperates with the upper surface of the plastic block, so that the metal block is embedded in the second installation gap and is pressed on the upper surface of the plastic block, and the metal block is welded, riveted or bonded with the main body part by glue.

5. The secondary battery top cover assembly of claim 1, wherein: The pressing block includes a first insulation part, the outer side surface of the first insulation part is provided with the second slope and the first connecting surface, a first metal layer is arranged on the inner side surface of the first insulation part, and the first metal layer is arranged corresponding to the side surface of the main body part; the first metal layer is welded with the side surface of the main body part or the first metal layer is arranged corresponding to the side surface of the main body part and is bonded with the side surface of the main body part by glue.

6. The secondary battery top cover assembly of claim 5, wherein: The material of the first insulation part is ceramic.

7. The secondary battery top cover assembly of claim 1, wherein: The pressing block includes a second insulation part, the outer side surface of the second insulation part is provided with the second slope and the first connecting surface, the inner side surface of the second insulation part is arranged corresponding to the side surface of the main body part, a second metal layer is arranged on the upper surface of the second insulation part, and the second metal layer is welded with the side surface of the main body part or the second metal layer and the inner side surface of the second insulation part are bonded with the side surface of the main body part by glue.

8. The secondary battery top cover assembly of claim 7, wherein: The material of the second insulation part is ceramic.

9. The top cover assembly of the secondary battery according to claim 1, wherein: The main body part of the pole is provided with a fifth inclined surface at the position connected with the flange, the fifth inclined surface is an annular surface inclined inward from bottom to top, the inner side of the insulation sealing ring is provided with a sixth inclined surface corresponding to the fifth inclined surface so that the insulation sealing ring is sleeved on the fifth inclined surface.

10. The secondary battery top cover assembly of claim 9, wherein: The outer side of the insulation sealing ring is provided with a seventh inclined surface, the seventh inclined surface is an annular surface inclined inward from bottom to top, the hole wall lower part of the through hole part is provided with an eighth inclined surface corresponding to the seventh inclined surface so that the through hole part abuts on the insulation sealing ring.

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