WO2024012172A1

WO2024012172A1 - Traction battery top cover

Info

Publication number: WO2024012172A1
Application number: PCT/CN2023/101779
Authority: WO
Inventors: 陆国强; 曾志亮; 徐涛; 谢迪波
Original assignee: 深圳市长盈精密技术股份有限公司
Priority date: 2022-07-15
Filing date: 2023-06-21
Publication date: 2024-01-18

Abstract

A traction battery top cover, comprising a cover plate (20) provided with pole holes (22), poles (30), plastic bodies (60), sealing rings (40) and welding rings (50). Each pole hole (22) comprises a boss obliquely extending upwards in a radial direction, a mounting penetration hole (221) penetrating the boss, an accommodation slot (226) located under the mounting penetration hole (221), and a welding ring slot (225) located under the accommodation slot (226). Each pole (30) comprises a fixing projecting ring (31) with an outer diameter greater than an inner diameter of the mounting penetration hole (221), and an upper end (32) and a lower end (33), which respectively extend from an upper and a lower end of the fixing projecting ring (31). The sealing ring (40) is clamped between the boss and the fixing projecting ring (31). The welding ring (50) is isolated from the pole (30) by the plastic body (60), and the welding ring (50) is accommodated in the welding ring slot (225) and is fixedly welded to the cover plate (20).

Description

Power battery top cover

Technical field

This application relates to the field of power batteries, and in particular, to a power battery top cover.

Background technique

A power battery includes a number of battery cells, a bus assembly that connects the battery cells in parallel, and a pair of poles that electrically connect the bus assembly and transmit electrical energy. There are liquid substances such as electrolyte injected into the power battery, and the sealing of the power battery needs to be maintained. In order to maintain the sealing, the power battery also includes a shell and a top cover that closes the shell, and the pole is fixed on the above the top cover and requires the cover plate of the top cover to maintain electrical isolation. Patent application No. 201921132385.1 of the People's Republic of China discloses a power battery top cover. The power battery top cover includes a cover plate with pole holes, poles, and plastics that integrally mold the poles into the pole holes. body, sealing ring and welding ring. The periphery of the pole hole protrudes upward to form a protruding ring portion. The pole is fixed on the lower side of the protruding ring portion by the plastic body. The sealing ring is sleeved under the cover plate, and then the The welding ring is inserted into the lower outer side of the pole, clamps the sealing ring, and is then welded to the welding ring on the lower side of the cover plate. The pole is fixed inside through the welding ring. In this technical solution, it is difficult to position the pole during injection molding, and the cost of in-mold injection molding is high. The sealing ring is fixed on the lower side of the pole, and the connecting piece is welded to the bottom of the pole. At this time, high temperature can easily affect the sealing ring, thereby affecting the sealing performance and triggering safety issues.

Contents of the invention

In view of this, it is necessary to provide a power battery top cover with stable sealing performance.

In order to solve the above technical problems, the present application provides a power battery top cover, which includes a cover plate with a pole hole, a pole, a plastic body, a seal and a welding ring. The pole hole includes a pole extending upward in the radial direction. The formed boss, the mounting perforation formed through the boss and the receiving groove located under the mounting perforation. The pole includes a fixing flange with an outer diameter larger than the inner diameter of the mounting perforation and an upper end of the fixing flange. extend the stated The upper end of the perforation is installed, the sealing ring is clamped between the boss and the fixed convex ring, the welding ring and the pole are separated by the plastic body, the welding ring and the The cover plate is welded and fixed, and the plastic body and the pole are fixed in the receiving groove.

In order to solve the above technical problems, this application also provides a power battery top cover, including a cover plate with a pole hole, a pole, a plastic body, a seal, a plastic cover and a welding ring. The pole hole includes A boss is formed by extending obliquely upward in the radial direction. The pole includes a fixed flange with an outer diameter larger than the inner diameter of the mounting hole and an upper end and a lower end respectively extending from the upper and lower ends of the fixed flange. The sealing ring is clamped between the boss and the fixed boss. After the plastic body is formed separately, it is assembled with the pole from bottom to top and installed upward into the boss in the pole hole. On the lower side, the welding ring is sleeved outside the lower end from below and is welded and fixed with the cover plate. The plastic is between the fixing convex ring, the outer side of the lower end and the cover plate. The plastic cover is separately formed and then inserted into the gap between the upper end and the boss.

In order to solve the above technical problems, this application also provides a power battery top cover, which includes a cover plate with a pole hole, a pole, a plastic body, a seal and a welding ring. The pole hole includes a radially upward A boss formed by extending obliquely and a mounting through hole formed through the boss. The pole includes a fixed flange with an outer diameter larger than the inner diameter of the mounting hole and an upper end respectively extending from the upper and lower ends of the fixed flange. The sealing ring includes a ring body clamped between the surface of the fixed convex ring and the bottom surface of the boss, and extends upward from the inner side of the ring body and is clamped between the inner side of the boss and the bottom surface of the boss. The isolating ring outside the upper end, the plastic body is clamped between the pole and the welding ring, the welding ring is sleeved on the outside of the lower end and is welded and fixed to the cover plate. Together, the fixing convex ring of the pole is fixed between the boss and the welding ring

The top cover of the power battery of this application is configured by arranging the pole into a fixed convex ring protruding in the middle and an upper end located at the upper end of the fixed convex ring, and placing the sealing ring between the fixed convex ring and the cover plate. between the crimping rings to avoid damaging the sealing ring due to the high temperature generated when welding the welding ring and the connecting piece.

The top cover of the power battery of this application is provided with an independent plastic body and a plastic cover. When the pole is loaded upward into the receiving groove, the plastic body is combined with the pole in advance. Compared with the existing technology, after installing the pole into the receiving groove, injection molding is performed to form the plastic body and the plastic cover. As for the technical solution of plastic parts, this embodiment makes it easier to control the position of the pole in the cover plate, without the need for in-mold injection molding, and the manufacturing cost is greatly reduced.

Description of drawings

The drawings described here 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 of the present application. In the attached picture:

Figure 1 is a three-dimensional assembly view of the power battery top cover of this application;

Figure 2 is a three-dimensional exploded view of the power battery top cover of this application;

Figure 3 is a perspective view of the cover plate of the power battery top cover of this application;

Figure 4 is a cross-sectional view along the dotted line B-B shown in Figure 3;

Figure 5 is a three-dimensional exploded view of the pole, plastic body, welding ring and sealing ring of the power battery top cover of the present application;

Figure 6 is a three-dimensional exploded view from another angle of the pole, plastic body, welding ring and sealing ring of the power battery top cover of the present application;

Figure 7 is a cross-sectional view along the dotted line C-C shown in Figure 2;

Figure 8 is a cross-sectional view along the dotted line A-A shown in Figure 1;

Figure 9 is a cross-sectional view of Embodiment 2 of the present application;

Figure 10 is a cross-sectional view of Embodiment 3 of the present application.

Description of reference numerals: inner shell - 10; inner shell - 11; through holes - 12, 221, 64; cover plate - 20; plate body - 21; pole hole - 22;
Installation hole-221; boss-222, 223; pull-up part-222; crimp ring-223; annular groove-224; combination hole-2241, 312, 53; welding ring groove-225; accommodation groove-226; explosion-proof port -23; injection hole-24; polar post-30; fixing convex ring-31; edge protrusion-311; groove structure-313; upper end-32; lower end-33; sealing ring-40; ring body-41 ; Extrusion part-42; Set hole-43; Wrapping wing part-44; Welding ring-50; Ring body-51; Perforation-52; Plastic body-60; Covering bottom wall-61; First embedded column-611; Second embedded column-612; covering side wall-62; side Face covering part-621; Top covering part-622; Lower side wrapping part-63; Plastic covering part-70; Groove fitting part-71; Extension part-72; Side extension part-721; Radial extension part-722 ; Isolation ring-73,45; Third embedded column-75; Connecting piece-80; Recessed welding part-81.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments.

In this application, the X direction shown in Figure 1 is the transverse direction, the Y direction is the longitudinal direction, and the Z direction is the upper vertical direction.

Embodiment 1

Please continue to refer to Figures 1 to 4. The top cover of the power battery of the present application includes a cover plate 20 with a pole hole 22, a pole 30 installed in the pole hole 22, and a pole clamped on the pole. 30 and the pole hole 22, and the plastic body 60 located on the lower side of the pole 30 and fixing the pole 30 and the plastic body 60 on the lower side of the plastic body 60. The welding ring 50 in the pole hole 22.

The cover plate 20 includes a plate body 21 , a pole hole 22 formed through the plate body 21 , an explosion-proof opening 23 and a liquid injection hole 24 . The upper surface of the outer circumference of the pole hole 22 is punched downward to form an annular groove 224, and the bottom surface of the plate body 21 corresponding to the annular groove 224 protrudes downward. The pole hole 22 includes a mounting through hole 221 formed through the upper and lower sides, a boss extending obliquely upward in the radial direction from the edge of the annular groove 224, a receiving groove 226 located on the lower side of the boss, and a receiving groove 226 located on the lower side of the boss. A welding ring groove 225 is formed by punching or cutting upward the edge of the mounting through hole 221 on the bottom surface of the plate body 21 . The boss includes a pull-up portion 222 extending radially upward from the edge of the annular groove 224 and a crimping ring 223 formed by horizontally bending from the top of the pull-up portion 222 and extending radially inwardly. The accommodating groove 226 is located in the space between the pull-up portions 222, and the welding ring groove 225 is located on the lower side of the accommodating groove 226 and is connected. The accommodating groove 226, the welding ring groove 225 and the mounting through hole 221 are all a part of the pole hole 22. The inner diameter of the mounting through hole 221 is smaller than the inner diameter of the receiving groove 226 , and the inner diameter of the receiving groove 226 is smaller than the inner diameter of the welding ring groove 225 . A number of coupling holes 2241 are opened downward on the annular groove 224, and the coupling holes 2241 are blind hole structures.

The pole 30 includes a fixing flange 31 , an upper end 32 protruding upward from the middle of the fixing flange 31 , and a lower end 33 protruding downward from the middle of the fixing flange 31 . The outer diameter of the fixing flange 31 is larger than the inner diameter of the mounting through hole 221 , and the outer diameter of the upper end 32 is smaller than the inner diameter of the mounting through hole 221 . The edge of the fixed flange 31 protrudes upward to form an edge protrusion 311. A groove structure 313 is formed between the edge protrusion 311 and the upper end 32. The sealing ring 40 is sleeved on the upper end 32. The outer periphery is accommodated in the groove structure 313 . A coupling hole 312 is formed upward on the bottom surface of the fixing convex ring 31 , and the coupling hole 312 is a blind hole structure.

The sealing ring 40 includes a ring body 41 that fits within the groove structure 313 , an extrusion portion 42 that protrudes upward from an outer portion of the ring body 41 , and a sleeve hole that is inserted into the upper end portion 32 . 43. The pressing portion 42 is clamped between the crimping ring 223 and the surface of the fixing protrusion 31 to achieve sealing.

The plastic body 60 includes a covering bottom wall 61 wrapped around the bottom surface of the fixing convex ring 31 , a covering side wall 62 extending upward from the covering bottom wall 61 and wrapping the outer surface of the fixing convex ring 31 , and a covering side wall 62 extending upward from the covering bottom wall 61 and wrapping the outer surface of the fixing convex ring 31 . The lower wrapping portion 63 extends downward from the inner edge of the covering bottom wall 61 and wraps around the outer periphery of the lower end portion 33 . The covering side wall 62 includes a side covering portion 621 extending upward from the outer periphery of the covering bottom wall 61 along the outer periphery of the fixing convex ring 31 and extending from the side covering portion 621 to cover the edge protrusion. The top cover 622 of 311. The upper and lower surfaces of the covering bottom wall 61 are respectively formed with a first embedded column 611 and a second embedded column 612 convex upward and downward, and the first embedded column 611 enters the combining hole 312 on the bottom surface of the fixed flange 31 Inside.

The plastic body 60 and the pole 30 can be integrally injection molded. The welding ring 50 includes an annular body 51, a through hole 52 for the lower end 33 of the pole post 30 to pass through, and a plurality of combining holes 53 formed through the annular body 51. The second embedded post 612 enters the welding ring 50. In the combination hole 53, the second embedded post 612 and the combination hole 53 are used for positioning or welding fixation. The surface of the annular body 51 is isolated from the bottom surface of the fixing convex ring 31 of the pole post 30 by the covering bottom wall 61 , and the space between the welding ring 50 and the lower end 33 of the pole post 30 is separated by the lower end surface of the pole post 30 . The side cover 63 is isolated.

The bottom surface of the crimping ring 223 and the upper surface of the fixed convex ring 31 are isolated from each other by the sealing ring 40 and the top covering part 622 , and the outer surface of the fixed convex ring 31 and the pull-up part 222 They are separated by the side covering part 621 .

The power battery top cover of this application also includes an inner shell 10 covering the bottom surface of the plate body 21 and a connecting piece 80 welded to the lower end 33 of the pole 30 . The inner shell 10 includes an inner shell 11 and a through hole 12 that penetrates the inner shell 11 up and down. The bottom surface of the lower end 33 of the pole 30 is exposed outside the through hole 12 . The connecting piece 80 includes a recessed welding portion 81 punched upward to cross the through hole 12 and welded with the pole 30 .

The power battery top cover of this embodiment also includes a plastic cover 70 . The plastic cover 70 includes a groove fitting portion 71 that fits on the surface of the annular groove 224 . An extension portion 72 extending along the boss and covering the boss, and an isolation ring 73 extending downward from the free end of the extension portion 72 and spaced between the upper end 32 and the inner surface of the crimp ring 223 . The bottom surface of the groove fitting portion 71 is protrudingly formed with a third embedding post 75 that is embedded in the combination hole 2241 .

The assembly method of the power battery top cover in this embodiment is as follows:

The sealing ring 40 is placed in the groove structure 313 around the upper end 32 of the pole 30 , and the pole 30 formed with the plastic body 60 is loaded into the receiving groove 226 from bottom to top, and then The welding ring 50 is placed into the welding ring groove 225, and the edge of the annular body 51 of the welding ring 50 is in contact with the cover plate 21; then, the welding ring 50 is welded and fixed to the welding ring groove 225. Inside, the fixing convex ring 31 of the pole post 30 is fixed between the crimping ring 223 and the welding ring 50 . The inner shell 10 is fixed to the bottom surface of the cover plate 20 by hot melting, and then the connecting piece 80 is welded and fixed to the bottom surface of the lower end 33 of the pole post 30 . Finally, the plastic cover 70 is injection molded, and the lower end of the isolation ring 73 of the plastic cover 70 fits the surface of the seal 40 .

The plastic cover 70 is covered on the cover 21 by injection molding.

In the power battery top cover of this embodiment, the pole post 30 is provided with a fixed convex ring 31 protruding in the middle and an upper end 32 and a lower end 33 located at the upper and lower ends of the fixed convex ring 31 , and the sealing ring 40 is It is placed between the fixing convex ring 31 and the crimping ring 223 of the cover plate 21 to prevent the high temperature generated when welding the welding ring 50 and the connecting piece 80 from damaging the sealing ring 40 .

The top cover of the power battery in this embodiment is provided with an independent plastic body 60 and a plastic cover 70. When the pole 30 is loaded upward into the receiving groove 226, the plastic body 60 is combined with the pole 30 in advance. Together, compared with the prior art, the pole 30 is installed into the receiving groove 226 and then formed by injection molding. The technical solution of the plastic part including the plastic body 60 and the plastic cover 70 makes it easier to control the position of the pole 30 in the cover 20 in this embodiment, without the need for in-mold injection molding, and the manufacturing cost is greatly reduced.

Embodiment 2

Please continue to refer to FIG. 9 , which is a second embodiment of the power battery top cover of the present application. In the second embodiment, the plastic body 60 is separately injection molded and then assembled with the pole 30 . In this way, it can be easily In order to greatly reduce costs, in this embodiment, the top covering portion 622 covering the side wall 62 needs to be removed, and only the side covering portion 621 is retained or partially retained. The first embedded column 611 is embedded in the combining hole 312 on the bottom surface of the fixing convex ring 31 and fixed by hot melting. In this embodiment, the sealing ring 40 includes a ring body 41 that fits on the surface of the fixing convex ring 31 and is bent downward from the outer edge of the ring body 41 and at least partially wraps the fixing convex ring 31 Wrapping wings 44 on the outside. The plastic cover 70 can be injection molded separately, and then the isolation ring 73 is inserted between the upper end 32 and the crimp ring 223 for isolation, and the third embedded column 75 is inserted into the annular groove 224 into the binding holes 2241 on the surface, and then fixed by heat melting.

In this embodiment, the top cover of the power battery is injection molded by separately molding the plastic part 60, and then the plastic part 60 is assembled on the lower side of the pole 30, so that the manufacturing cost is low, and the upper side of the pole 30 is The sealing ring 40 is completely covered, and the edge of the sealing ring 40 is bent downward to form a wrapping wing 44 that at least partially wraps the outer surface of the fixing convex ring 31 of the pole post 30 , so that the plastic part 60 can be individually formed. The assembly cannot cover the defects on the upper side of the pole 30 .

Embodiment 3

Please continue to refer to FIG. 10 . The difference between the second embodiment and the first embodiment is that the plastic cover 70 or the isolation ring 73 of the plastic cover 70 is eliminated. Instead, the seal is The inner edge of the ring 40 protrudes upward to form an isolation ring 45 wrapped around the outer circumference of the upper end 32, thus reducing the need for the plastic cover 70 and assembly, and the cover plate 20 no longer needs to be recessed downward to form an annular groove 224, reducing the need for The processing and assembly processes are eliminated, greatly reducing manufacturing costs.

The technical features of the above embodiments can be combined in any way. In order to simplify the description, the above implementations are not described. All possible combinations of each technical feature in the embodiment are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above embodiments only express preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the patent of the present invention should be determined by the appended claims.

Claims

A power battery top cover, including a cover plate with a pole hole, a pole, a plastic body, a seal and a welding ring, characterized in that the pole hole includes a boss extending upward in the radial direction, a penetrating The mounting perforation formed by the boss and the receiving groove located under the mounting perforation. The pole includes a fixing flange with an outer diameter larger than the inner diameter of the mounting perforation and the mounting perforation extending from the upper end of the fixing flange. The upper end of the sealing ring is clamped between the boss and the fixed convex ring, the welding ring and the pole are separated by the plastic body, and the welding ring and the cover plate Weld and fix the plastic body and the pole in the receiving groove.
The power battery top cover according to claim 1, characterized in that the power battery top cover further includes a plastic cover, and the plastic cover includes an upper end portion isolated from the boss and the pole. isolation ring.
The power battery top cover according to claim 2, wherein the cover plate is punched downward to form an annular groove at the edge of the pole hole, and the boss includes an annular groove extending from the annular groove. There is a pull-up portion formed by extending obliquely upward from the edge and a crimping ring formed by vertically bending from the pull-up portion. The installation through-hole penetrates the crimping ring, and the accommodation groove is located between the pull-up portions. The inner diameter of the receiving groove is larger than the inner diameter of the mounting through hole.
The power battery top cover according to claim 3, wherein the plastic cover includes a groove fitting portion that fits on the surface of the annular groove, and an extension portion that extends along the boss. The isolation ring extends downward from the extension part into the gap between the upper end of the pole and the crimp ring.
The power battery top cover according to claim 2, wherein the pole further includes a lower end protruding downward from the bottom of the fixed convex ring, and the plastic body and the pole are integrally injection molded. , the plastic body includes a covering bottom wall covering the bottom surface of the fixing convex ring, a covering side wall extending upward from the outside of the covering bottom wall and wrapping the outer side and upper edge of the fixing convex ring, and a covering side wall extending from the outer side of the fixing convex ring. The lower wrapping portion covers the inner side of the bottom wall and extends downward to wrap the outer periphery of the lower end portion.
The power battery top cover according to claim 5, characterized in that the edge of the fixed convex ring protrudes upward to form an edge protrusion, and a seal is formed between the edge protrusion and the upper end portion to accommodate the seal. The groove structure of the ring, the covering side wall includes a side covering part covering the outside of the fixing convex ring and a top covering part covering the edge protrusion.
The power battery top cover according to claim 6, wherein the sealing ring includes a ring body that fits on the surface of the groove structure and an extrusion portion that protrudes upward from the outside of the ring body. The crimping ring and the fixed convex ring press the extrusion part and make the sealing ring and the lower end of the isolation ring come into contact together.
The power battery top cover according to claim 7, wherein a plurality of coupling holes are provided on the bottom surface of the fixed convex ring and the welding ring, and the coupling holes on the bottom surface of the fixed convex ring are blind holes, and the The coupling hole on the welding ring is a perforation. The upper surface of the covering bottom wall of the plastic body protrudes upward to form a number of first embedded pillars embedded in the coupling hole of the fixed convex ring. The lower surface of the covering bottom wall protrudes. A plurality of second embedded posts embedded in the combining holes of the welding ring are formed.
The power battery top cover according to claim 1, wherein the power battery top cover further includes an inner shell and a connecting piece, and the inner shell includes an inner shell and a through hole penetrating the inner shell. The inner shell is installed on the bottom surface of the cover plate, and the bottom surface of the pole is at least partially exposed to the outside through the through hole. The connecting piece is punched upward to form a recessed welding portion, and the recessed welding portion is attached to the pole bottoms and welded together.
The power battery top cover according to claim 4, wherein the annular groove surface of the cover plate is recessed downward to form a plurality of coupling holes, and the bottom surface of the groove fitting portion is protruding to form a plurality of third embedded holes. column, the third embedded column enters the combination hole and is fixed, and the plastic cover is integrally formed on the cover plate.
The power battery top cover according to claim 1, wherein the cover plate is recessed upward to form a welding ring groove on the periphery of the receiving groove, and the welding ring is buckled into the welding ring groove and connected with the welding ring groove. The covers are welded together.
A power battery top cover, including a cover plate with a pole hole, a pole, a plastic body, a seal, a plastic cover and a welding ring. The feature is that the pole hole includes a cover plate and a pole extending upward in a radial direction. The pole includes a fixed flange with an outer diameter larger than the inner diameter of the installation hole and an upper end and a lower end respectively extending from the upper and lower ends of the fixed flange. The sealing ring is clamped on the boss. The boss and Between the fixed convex rings, the plastic body is separately formed and assembled with the pole from bottom to top and installed upward into the lower side of the boss in the pole hole, and the welding ring is sleeved from below Outside the lower end and welded and fixed with the cover plate, the fixing convex ring, the outer side of the lower end and the cover plate are isolated by the plastic body. After the plastic cover is formed separately Fit into the gap between the upper end and the boss.
The power battery top cover according to claim 12, wherein the plastic body includes a covering bottom wall covering the bottom surface of the fixing convex ring, and a covering bottom wall formed by being bent upward from the outer edge of the covering bottom wall. The sealing ring at least completely covers the upper surface of the fixed convex ring.
The power battery top cover according to claim 13, wherein the sealing member includes a ring body covering the surface of the fixed convex ring and a ring extending downward from the outer edge of the ring to cover the fixed convex ring. The outer side or the wrapping wing on the outer side of the plastic is clamped between the boss and the fixed flange.
The power battery top cover according to claim 14, characterized in that an annular groove is formed by punching downward at the position of the pole hole, and the boss includes an annular groove extending obliquely upward from an edge of the annular groove. The upper pull-up part and the crimping ring formed by vertically bending from the upper pull-up part, the installation perforation penetrates the crimping ring, the upper pull-up part is formed with a receiving groove, and the lower side of the receiving groove is also recessed. A welding ring groove is formed, the inner diameter of the welding ring groove is greater than the inner diameter of the receiving groove, and the inner diameter of the receiving groove is greater than the inner diameter of the mounting through hole.
The power battery top cover according to claim 15, characterized in that the combination of the sealing ring, the pole and the plastic body is installed in the accommodation groove, and the upper end passes upward through the installation The perforation is exposed to the outside, and the bottom portion of the plastic body covering the bottom wall is located in the welding ring groove. The welding ring is pressed into the welding ring groove and applies upward pressure to compress the sealing ring. The edge of the welding ring is welded and fixed with the cover plate, and the pole is fixed between the crimping ring and the welding ring.
The power battery top cover according to claim 16, wherein a plurality of coupling holes are provided on the bottom surface of the fixed convex ring and the welding ring, and the coupling holes on the bottom surface of the fixed convex ring are blind holes, so The coupling hole on the welding ring is a perforation, and the upper surface of the covering bottom wall of the plastic body protrudes upward to form a number of first embedded pillars embedded in the coupling hole of the fixed convex ring. The lower surface of the covering bottom wall protrudes A plurality of second embedded posts embedded in the combination holes of the welding ring are formed, the pole posts and the welding ring are installed into the plastic body, and the first embedded posts and the second embedded posts are heated through The welding process is fixed together with the pole and the welding ring.
The power battery top cover according to claim 15, wherein the plastic cover includes a groove fitting portion that fits on the surface of the annular groove, an extension portion extending along the boss, and the The isolation ring extends downward from the extension part into the gap between the upper end of the pole and the crimping ring.
The power battery top cover according to claim 18, wherein the annular groove surface of the cover plate is recessed downward to form a plurality of coupling holes, and the bottom surface of the groove fitting portion is protruding to form a plurality of third embedded holes. column, the third embedded column enters the combining hole. After the plastic cover is assembled to the cover plate, the third embedded column is melted and fixed in the combining hole by hot melting. , the extension part includes a side extension part extending obliquely upward along the outer surface of the pull-up part along the inner edge of the groove fitting part and a diameter extending from the side extension part and covering the top surface of the crimp ring. Towards the extension part, the isolation ring is formed by extending downward from the end edge of the radially extending part.
A power battery top cover, including a cover plate with pole holes, poles, plastic bodies, seals and welding rings, characterized in that the pole holes include a boss formed by extending obliquely upward in the radial direction; The pole post includes a fixing flange with an outer diameter larger than the inner diameter of the fixing flange and an upper end and a lower end respectively extending from the upper and lower ends of the fixing flange. The sealing ring includes a ring body clamped between the surface of the fixed convex ring and the bottom surface of the boss, and a spacer extending upward from the inside of the ring body and clamped between the inside of the boss and the outside of the upper end. ring, the plastic body is clamped between the pole and the welding ring, the welding ring is sleeved on the outside of the lower end and is welded and fixed with the cover plate, and the pole A fixing flange is fixed between the boss and the welding ring.