Power battery cover

Abstract

A power battery top cover includes a cover plate with a pole hole, a pole, a plastic body, a seal, a plastic cover and a welding ring, wherein the pole hole includes a boss extending radially upwardly, the pole includes a fixed convex ring with an outer diameter greater than the inner diameter of the mounting through hole, and an upper end and a lower end extending from the upper and lower ends of the fixed convex ring, respectively, the sealing ring is clamped between the boss and the fixed convex ring, the plastic body is separately molded and assembled with the pole from bottom to top and is inserted upward into the lower side of the boss in the pole hole, the welding ring is sleeved from below outside the lower end and is welded and fixed to the cover plate, the outer side surfaces of the fixed convex ring and the lower end are isolated from the cover plate by the plastic body, and the plastic cover is separately molded and inserted into the gap between the upper end and the boss. The power battery top cover of the present application has low manufacturing cost and good sealing performance.

Description

Technical Field

[0001] The present application relates to the field of power batteries, and in particular to a power battery top cover. Background Art

[0002] The power battery includes a number of battery cells, a busbar assembly that connects the battery cells in parallel, and a pair of poles that electrically connect the busbar assembly and transmit electrical energy. Liquid substances such as electrolyte are injected into the power battery, and the sealing of the power battery needs to be maintained. To maintain the sealing, the power battery also includes an outer shell and a top cover that closes the outer shell. The pole is fixed on the top cover and the cover plate of the top cover needs to maintain electrical isolation. Patent application No. 201921132385.1 of the People's Republic of China discloses a power battery top cover, which includes a cover plate with a pole hole, a pole, a plastic body that integrally molds the pole in the pole hole, a sealing ring and a welding ring. The periphery of the pole hole protrudes upward to form a protruding ring portion, and the pole is fixed to the lower side of the protruding ring portion by the plastic body. The sealing ring is sleeved under the cover plate, and then the welding ring is sleeved into the outer side below the pole and clamped to weld to the welding ring on the lower side of the cover plate, and the pole is fixed inside by the welding ring. This technical solution is difficult to position the pole during injection molding, and the cost of in-mold injection molding is relatively high. The sealing ring is fixed to the lower side of the pole. When the connecting piece is welded and fixed to the bottom surface of the pole, the high temperature is likely to affect the sealing ring, thereby affecting the sealing performance and triggering safety issues. Summary of the invention

[0003] In view of this, it is necessary to provide a power battery top cover with low injection molding requirements and low manufacturing cost.

[0004] To solve the above technical problems, the present application provides a power battery top cover, including a cover plate provided with a pole hole, a pole, a plastic body, a sealing member, a plastic covering member and a welding ring, the pole hole including a boss extending radially upward and obliquely and a mounting through-hole penetrating the boss, the pole including a fixing convex ring with an outer diameter larger than an inner diameter of the mounting through-hole and an upper end portion and a lower end portion extending from upper and lower ends of the fixing convex ring respectively, the sealing ring being clamped between the boss and the fixing convex ring, the plastic body being separately formed and assembled with the pole from bottom to top and being upwardly loaded into the lower side of the boss in the pole hole, the welding ring being sleeved from bottom to outside the lower end portion and being welded and fixed to the cover plate, the fixing convex ring and the outer side surfaces of the lower end portion being isolated from the cover plate by the plastic body, and the plastic covering member being separately formed and loaded into the gap between the upper end portion and the boss.

[0005] Preferably, the plastic body includes a covering bottom wall covering the bottom surface of the fixed convex ring, a covering side wall bent upward from the outer edge of the covering bottom wall to cover the outer side surface of the fixed convex ring, and a lower side wrapping portion extending downward from the inner edge of the covering bottom wall, and the sealing ring at least completely covers the upper surface of the fixed convex ring.

[0006] Preferably, the seal comprises a ring body covering the surface of the fixed convex ring and a wrapping wing extending downward from the outer edge of the ring body and covering the outer side surface of the fixed convex ring or the outer side surface of the plastic body, and the wrapping wing is clamped between the boss and the fixed convex ring.

[0007] Preferably, an annular groove is formed by punching downward at the position of the pole hole, the boss includes a pull-up portion extending obliquely upward from the edge of the annular groove and a crimping ring formed by vertically bending from the pull-up portion, the mounting through-hole passes through the crimping ring, a receiving groove is formed in the pull-up portion, a welding ring groove is also recessed on the lower side of the receiving groove, the inner diameter of the welding ring groove is larger than the inner diameter of the receiving groove, and the inner diameter of the receiving groove is larger than the inner diameter of the mounting through-hole.

[0008] Preferably, the combination of the sealing ring, the pole and the plastic body is loaded into the accommodating groove, the upper end portion is upwardly passed through the mounting through hole to be exposed to the outside, the bottom surface 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 to apply pressure upward and compress the sealing ring, the edge of the welding ring is welded and fixed to the cover plate, and the pole is fixed between the crimping ring and the welding ring.

[0009] Preferably, a plurality of coupling holes are provided on the bottom surface of the fixing convex ring and the welding ring, the coupling holes on the bottom surface of the fixing convex ring are blind holes, and the coupling holes on the welding ring are through holes, the upper surface of the covering bottom wall of the plastic body protrudes upward to form a plurality of first embedded columns embedded in the coupling holes of the fixing convex ring, and the lower surface of the covering bottom wall protrudes to form a plurality of second embedded columns embedded in the coupling holes of the welding ring, the pole and the welding ring are installed in the plastic body, and the first embedded columns and the second embedded columns are fixed to the pole and the welding ring through a hot melt process.

[0010] Preferably, the plastic cover comprises a groove fitting portion fitted to the surface of the annular groove, an extension portion formed along the boss, and the isolation ring, wherein the isolation ring extends downward from the extension portion into the gap between the upper end of the pole and the crimping ring.

[0011] Preferably, the surface of the annular groove of the cover plate is recessed downward to form a plurality of combining holes, and the bottom surface of the groove fitting portion protrudes to form a plurality of third embedded columns, and the third embedded columns enter the combining holes. After the plastic cover is assembled to the cover plate, the third embedded columns are melted and fixed in the combining holes by hot melting.

[0012] Preferably, the extension portion includes a side extension portion extending obliquely upward along the inner edge of the groove fitting portion along the outer surface of the pull-up portion and a radial extension portion extending from the side extension portion and covering the top surface of the crimping ring, and the isolation ring is formed by extending downward from the end edge of the radial extension portion.

[0013] Preferably, the power battery top cover also includes an inner shell and a connecting piece, the inner shell includes an inner shell and a through hole penetrating the inner shell, the through hole corresponds to the lower end of the pole, the inner shell is installed on the bottom surface of the cover plate, the lower end of the pole is exposed to the outside through the through hole, the connecting piece is stamped upward to form a recessed welding portion, and the recessed welding portion is attached to the surface of the lower end and welded together.

[0014] The power battery top cover of the present application is provided with an independent plastic body and a plastic cover for isolation. The plastic body is separately molded and then assembled on the pole, and the plastic cover is molded and then assembled on the cover plate. There is no need for in-mold injection molding, which greatly reduces the manufacturing cost. At the same time, when the pole is upwardly loaded into the receiving groove, the plastic body is pre-combined with the pole and can be loaded step by step. There is no need for high-precision equipment to control the accuracy, and assembly and manufacturing are easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 This is a three-dimensional assembly diagram of the power battery top cover of this application;

[0017] Figure 2 This is a three-dimensional exploded view of the power battery top cover of this application;

[0018] Figure 3 A three-dimensional diagram of the cover plate of the power battery top cover of this application;

[0019] Figure 4 For along Figure 3 A cross-sectional view taken along the dashed line BB shown;

[0020] Figure 5 This is a three-dimensional exploded view of the pole, plastic body, welding ring and sealing ring of the power battery top cover of this application;

[0021] Figure 6 This 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 from another angle;

[0022] Figure 7 For along Figure 2 A cross-sectional view of the CC dashed line shown;

[0023] Figure 8 For along Figure 1 A cross-sectional view taken along the dashed line AA shown;

[0024] Fig. 9 It is a cross-sectional view of the second embodiment of the present application;

[0025] Fig.10 This is a cross-sectional view of the third embodiment of the present application.

[0026] Description of Reference Numerals

[0027] Inner shell-10; inner shell-11; through hole-12, 221, 64; cover plate-20; plate body-21; pole hole-22; mounting through hole-221; boss-222, 223; pull-up part-222; crimping ring-223; annular groove-224; combining hole-2241, 312, 53; welding ring groove-225; containing groove-226; explosion-proof port-23; injection hole-24; pole-30; fixing convex ring-31; edge protrusion-311; groove structure-313; upper end-32; lower end-33; sealing ring-40; ring body-41 ; Extrusion portion-42; Hole-43; Wrapping wing-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 covering portion-621; Top covering portion-622; Lower wrapping portion-63; Plastic covering part-70; Groove fitting portion-71; Extension portion-72; Side extension portion-721; Radial extension portion-722; Isolation ring-73,45; Third embedded column-75; Connecting piece-80; Recessed welding portion-81. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of this application clearer, the technical solution of this application will be clearly and completely described below in combination with the specific embodiments of this application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of them.

[0029] This application is Figure 1 The X direction is the lateral direction, the Y direction is the longitudinal direction, and the Z direction is the vertical direction upward.

[0030] Embodiment 1

[0031] Please continue reading Figures 1 to 4 As shown, the power battery top cover of the present application includes a cover plate 20 provided with a pole hole 22, a pole 30 inserted into the pole hole 22, a sealing ring 40 clamped between the pole 30 and the pole hole 22, a plastic body 60 provided on the lower side of the pole 30, and a welding ring 50 located on the lower side of the plastic body 60 and fixing the pole 30 and the plastic body 60 in the pole hole 22.

[0032] The cover plate 20 includes a plate body 21, a pole hole 22 formed through the plate body 21, an explosion-proof port 23 and a liquid injection hole 24. A circle of annular grooves 224 are punched downward on the outer circumferential upper surface of the pole hole 22, 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 by passing through from top to bottom, a boss extending radially and obliquely upward from the edge of the annular groove 224, a receiving groove 226 located at the lower side of the boss, and a welding ring groove 225 formed by punching or cutting upward from 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 horizontally bent from the top of the pull-up portion 222 and extending radially inward. The receiving groove 226 is located in the space between the pull-up portions 222. The welding ring groove 225 is located at the lower side of the receiving groove 226 and is connected. The receiving groove 226, the welding ring groove 225 and the mounting through hole 221 are all 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 plurality of coupling holes 2241 are opened downward on the annular groove 224, and the coupling holes 2241 are blind hole structures.

[0033] The pole 30 includes a fixed protruding ring 31, an upper end portion 32 protruding upward from the middle of the fixed protruding ring 31, and a lower end portion 33 protruding downward from the middle of the fixed protruding ring 31. The outer diameter of the fixed protruding ring 31 is larger than the inner diameter of the mounting through hole 221, and the outer diameter of the upper end portion 32 is smaller than the inner diameter of the mounting through hole 221. The edge of the fixed protruding ring 31 protrudes upward to form an edge protrusion 311, and a groove structure 313 is formed between the edge protrusion 311 and the upper end portion 32. The sealing ring 40 is sleeved on the outer periphery of the upper end portion 32 and accommodated in the groove structure 313. A coupling hole 312 is opened upward on the bottom surface of the fixed protruding ring 31, and the coupling hole 312 is a blind hole structure.

[0034] The sealing ring 40 includes a ring body 41 fitted in the groove structure 313, an extrusion portion 42 protruding upward from the outer portion of the ring body 41, and a sleeve hole 43 inserted into the outer side of the upper end 32. The extrusion portion 42 is clamped between the crimping ring 223 and the surface of the fixing protrusion 31 to achieve sealing.

[0035] The plastic body 60 includes a covering bottom wall 61 wrapped around the bottom surface of the fixing protruding ring 31, a covering side wall 62 extending upward from the covering bottom wall 61 and wrapping the outer side surface of the fixing protruding ring 31, and a lower side wrapping portion 63 extending downward from the inner edge of the covering bottom wall 61 and wrapping 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 protruding ring 31 and wrapping, and a top covering portion 622 extending from the side covering portion 621 and covering the edge protrusion 311. The upper and lower surfaces of the covering bottom wall 61 protrude upward and downward to form a first embedded column 611 and a second embedded column 612, respectively, and the first embedded column 611 enters the coupling hole 312 on the bottom surface of the fixing protruding ring 31.

[0036] 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 30 to pass through, and a plurality of coupling holes 53 formed through the annular body 51, and the second embedded column 612 enters the coupling hole 53, and the second embedded column 612 and the coupling hole 53 are used for positioning or welding and fixing. The surface of the annular body 51 and the bottom surface of the fixed convex ring 31 of the pole 30 are isolated by the covering bottom wall 61, and the welding ring 50 and the lower end 33 of the pole 30 are isolated by the lower side wrapping portion 63.

[0037] The bottom surface of the crimping ring 223 and the upper surface of the fixing convex ring 31 are isolated from each other by the sealing ring 40 and the top covering portion 622 , while the outer side surface of the fixing convex ring 31 and the upper pull-up portion 222 are isolated by the side covering portion 621 .

[0038] The power battery top cover of the present 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 penetrating the inner shell 11 from top to bottom, and 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 that is punched upward to pass through the through hole 12 and is welded to the pole 30.

[0039] The power battery top cover of this embodiment further includes a plastic cover 70, which includes a groove fitting portion 71 fitted to the surface of the annular groove 224, an extension portion 72 extending from the groove fitting portion 71 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 portion 32 and the inner side surface of the crimping ring 223. A third embedded column 75 is formed on the bottom surface of the groove fitting portion 71 and is embedded in the combination hole 2241.

[0040] The assembly method of the power battery top cover of this embodiment is as follows:

[0041] The sealing ring 40 is sleeved in the groove structure 313 on the outer periphery of the upper end 32 of the pole 30, the pole 30 formed with the plastic body 60 is installed from bottom to top into the receiving groove 226, and then the welding ring 50 is placed in the welding ring groove 225, and the edge of the ring body 51 of the welding ring 50 contacts the cover plate 20; then, the welding ring 50 is welded and fixed in the welding ring groove 225, and then the fixing convex ring 31 of the pole 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 30. Finally, the plastic cover 70 is injection molded, and the lower end of the isolation ring 73 of the plastic cover 70 is attached to the surface of the sealing member 40.

[0042] The plastic cover 70 is covered on the cover plate 20 by injection molding.

[0043] The power battery top cover of this embodiment arranges the pole 30 into a fixed convex ring 31 with a middle convex shape and an upper end 32 and a lower end 33 located at the upper and lower ends of the fixed convex ring 31, and places the sealing ring 40 between the fixed convex ring 31 and the crimping ring 223 of the cover plate 20, so as to avoid damage to the sealing ring 40 caused by high temperature generated when welding the welding ring 50 and the connecting piece 80.

[0044] The power battery top cover of this embodiment is provided with an independent plastic body 60 and a plastic cover 70. When the pole 30 is upwardly loaded into the receiving groove 226, the plastic body 60 is preliminarily combined with the pole 30. Compared with the prior art, after the pole 30 is loaded into the receiving groove 226, the plastic part including the plastic body 60 and the plastic cover 70 is formed by injection molding. In this embodiment, it is easier to control the position of the pole 30 in the cover plate 20 without in-mold injection molding, and the manufacturing cost is greatly reduced.

[0045] Embodiment 2

[0046] Please continue reading Fig. 9 As shown, it is the 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 assembled with the pole 30, so that the cost can be greatly reduced. In this embodiment, the top covering part 622 covering the side wall 62 needs to be removed, and only the side covering part 621 is retained or partially retained. The first embedded column 611 is embedded in the combination hole 312 on the bottom surface of the fixed convex ring 31 and fixed by hot melting. In this embodiment, the sealing ring 40 includes a ring body 41 attached to the surface of the fixed convex ring 31 and a wrapping wing 44 bent downward from the outer edge of the ring body 41 and at least partially wrapping the outer side of the fixed convex ring 31. The plastic cover 70 can be separately injection molded, and then the isolation ring 73 is inserted between the upper end 32 and the crimping ring 223 for isolation, and the third embedded column 75 is inserted into the combination hole 2241 on the surface of the annular groove 224, and then fixed by hot melting.

[0047] The power battery top cover of this embodiment is manufactured at a low cost by separately injection-molding the plastic body 60 and then assembling the plastic body 60 on the lower side of the pole 30. The upper side of the pole 30 is completely covered by the sealing ring 40, and the edge of the sealing ring 40 is bent downward to form a wrapping wing 44 that at least partially wraps the outer side of the fixing convex ring 31 of the pole 30, thereby achieving the defect that the plastic body 60 is assembled after being separately molded and cannot cover the upper side of the pole 30.

[0048] Embodiment 3

[0049] Please continue reading Fig.10 As shown, the difference between the second embodiment and the first embodiment is that the plastic cover 70 is eliminated, or the isolation ring 73 of the plastic cover 70 is eliminated. Instead, the inner edge of the sealing ring 40 protrudes upward to form an isolation ring 45 wrapped around the outer periphery of the upper end portion 32, thereby reducing the plastic cover 70 and the assembly, and the cover plate 20 no longer needs to be recessed downward to form the annular groove 224, thereby reducing the processing steps and the assembly steps, and greatly reducing the manufacturing cost.

[0050] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments 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.

[0051] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations 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 protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A power battery top cover, comprising a cover plate with a pole hole, a pole, a plastic body, a seal, a plastic cover and a welding ring, characterized in that: The pole hole includes a boss extending radially upward and obliquely and a mounting through hole penetrating the boss, the pole includes a fixing convex ring with an outer diameter larger than the inner diameter of the mounting through hole and an upper end and a lower end extending from the upper and lower ends of the fixing convex ring, respectively, a sealing ring is clamped between the boss and the fixing convex ring, the plastic body is separately molded and assembled with the pole from bottom to top and is upwardly loaded into the lower side of the boss in the pole hole, the welding ring is sleeved from the bottom outside the lower end and is welded and fixed to the cover plate, the fixing convex ring and the outer side surface of the lower end are isolated from the cover plate by the plastic body, and the plastic cover is separately molded and loaded into the gap between the upper end and the boss; The pole hole is punched downward to form an annular groove, the boss includes a pull-up portion extending obliquely upward from the edge of the annular groove and a crimping ring vertically bent from the pull-up portion, the mounting through-hole passes through the crimping ring, a receiving groove is formed in the pull-up portion, and a welding ring groove is also formed on the lower side of the receiving groove; The combination of the sealing ring, the pole and the plastic body is loaded into the accommodating groove, the upper end portion passes upward through the mounting through hole to be exposed to the outside, the bottom surface 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 to apply pressure upward and compress the sealing ring, the edge of the welding ring is welded and fixed to the cover plate, and the pole is fixed between the crimping ring and the welding ring.

2. The power battery top cover according to claim 1, characterized in that: The plastic body includes a covering bottom wall covering the bottom surface of the fixed convex ring, a covering side wall bent upward from the outer edge of the covering bottom wall to cover the outer side surface of the fixed convex ring, and a lower side wrapping portion extending downward from the inner edge of the covering bottom wall. The sealing ring at least completely covers the upper surface of the fixed convex ring.

3. The power battery top cover according to claim 2, characterized in that: The sealing member includes a ring body covering the surface of the fixed convex ring and a wrapping wing portion extending downward from the outer edge of the ring body and covering the outer side surface of the fixed convex ring or the outer side surface of the plastic body, wherein the wrapping wing portion is clamped between the boss and the fixed convex ring.

4. The power battery top cover according to claim 3, characterized in that: The inner diameter of the welding ring groove is larger than the inner diameter of the receiving groove, and the inner diameter of the receiving groove is larger than the inner diameter of the mounting through hole.

5. The power battery top cover according to claim 4, characterized in that: A plurality of coupling holes are provided on the bottom surface of the fixed convex ring and the welding ring. The coupling holes on the bottom surface of the fixed convex ring are blind holes, and the coupling holes on the welding ring are through holes. The upper surface of the covering bottom wall of the plastic body protrudes upward to form a plurality of first embedded columns embedded in the coupling holes of the fixed convex ring, and the lower surface of the covering bottom wall protrudes to form a plurality of second embedded columns embedded in the coupling holes of the welding ring. The pole and the welding ring are installed in the plastic body, and the first embedded column and the second embedded column are fixed to the pole and the welding ring through a hot melt process.

6. The power battery top cover according to claim 4, characterized in that: The plastic cover comprises a groove fitting portion fitted to the surface of the annular groove, an extension portion extending along the boss, and an isolation ring, wherein the isolation ring extends downward from the extension portion into a gap between the upper end of the pole and the crimping ring.

7. The power battery top cover according to claim 6, characterized in that: The surface of the annular groove of the cover plate is concave downward to form a plurality of combining holes, and the bottom surface of the groove fitting portion protrudes to form a plurality of third embedded columns, and the third embedded columns enter the combining holes. After the plastic cover is assembled to the cover plate, the third embedded columns are melted and fixed in the combining holes by hot melting.

8. The power battery top cover according to claim 7, characterized in that: The extension portion includes a side extension portion extending obliquely upward along the inner edge of the groove fitting portion along the outer surface of the pull-up portion and a radial extension portion extending from the side extension portion and covering the top surface of the crimping ring. The isolation ring is formed by extending downward from the end edge of the radial extension portion.

9. The power battery top cover according to any one of claims 1 to 8, characterized in that: The power battery top cover also includes an inner shell and a connecting piece. The inner shell includes an inner shell and a through hole penetrating the inner shell. The through hole corresponds to the lower end of the pole. The inner shell is installed on the bottom surface of the cover plate. The lower end of the pole is exposed to the outside through the through hole. The connecting piece is stamped upward to form a recessed welding portion, and the recessed welding portion is attached to the surface of the lower end and welded together.

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