Battery top cover, assembly method and power battery

Abstract

A battery top cover includes a cover plate provided with a pole hole and a pole assembly assembled in the pole hole, the pole hole includes a through hole, a bottom wall formed at the periphery of the through hole and a side wall protruding upward from the periphery of the bottom wall, the pole assembly includes a pole, a seal and an upper shell, the pole includes a fixing ring and a connecting portion protruding upward from the middle of the fixing ring, the upper shell includes a covering body covering the upper surface of the fixing ring, an isolation protrusion protruding upward from the inner edge of the covering body and an annular body extending downward from the outer edge of the covering body to cover the outer side of the fixing ring, the seal is clamped between the fixing ring and the bottom wall, and the side wall is folded inward to form a flange pressed on the covering body. The present application also includes a battery top cover assembly method and a power battery.

Description

Technical Field

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

[0002] Battery technology is widely used in electric motorcycles, creating great economic benefits for society, while also being environmentally friendly and reducing emissions. The most important performance characteristics of automotive batteries include safety, energy density, and impact resistance. The power battery includes a number of battery cells, each of which is connected in series and parallel to form a powerful automotive battery pack. Each battery cell includes a battery casing, a battery cell encapsulated in the battery casing, an electrolyte, and a battery top cover that seals the battery casing. Battery cells come in a variety of forms, and the most commonly used ones on the market include cylindrical batteries, square batteries, and blade batteries. Although the battery shapes are diverse, the product component composition principles are consistent, and all include components such as a casing and a top cover.

[0003] Patent application No. 201911418867.8 of the People's Republic of China discloses a power battery top cover structure, which includes a cover plate with a pole hole, a pole, and a rubber-coated part formed on the periphery of the pole. The pole hole is formed on the cover plate, and the pole hole is formed with a lower step and a vertical wall whose outer wall is not vertical in the initial state. The pole includes a convex ring, and the rubber-coated part extends to the periphery of the lower surface of the convex ring. The edge of the bottom surface of the convex ring contacts the lower step through the rubber-coated part, and the rubber-coated part also covers the upper surface of the convex ring. After the pole is installed in the pole hole, the upper side of the vertical wall is riveted to make the upper end of the vertical wall bend inward to form a flange that presses the upper surface of the convex ring, thereby fixing the pole. Patent application No. 201911418867.8 simplifies the product structure, but the forming process of the pole hole of the cover plate is difficult; the rubber-coated part and the pole are molded in the mold, the injection molding cost is high, and the rubber-coated part must be sealed, and it must be made of flexible materials such as silicone, that is, the upper and lower sides of the pole are crimped with flexible materials, which is prone to stability problems and has high material costs. The rubber-coated part and the pole are integrally formed, and the versatility is poor. Summary of the invention

[0004] In view of this, it is necessary to provide a battery top cover, an assembly method and a power battery with a simple structure and a long service life.

[0005] In order to solve the above technical problems, the present application provides a battery top cover, including a cover plate provided with a pole hole and a pole assembly assembled in the pole hole, the pole hole including a through hole, a bottom wall formed at the periphery of the through hole and a side wall protruding upward from the periphery of the bottom wall, the pole assembly including a pole, a seal and an upper shell, the pole including a fixing ring and a connecting portion protruding upward from the middle of the fixing ring, the upper shell including a covering body covering the upper surface of the fixing ring, an isolation protrusion protruding upward from the inner edge of the covering body and an annular body extending downward from the outer edge of the covering body to cover the outer side surface of the fixing ring, the seal is clamped between the fixing ring and the bottom wall, and the side wall is folded inward to form a flange pressed on the covering body.

[0006] Preferably, the upper shell is made of conductive plastic material, and the resistance of the conductive plastic is between 1-10000 ohms.

[0007] Preferably, the pole also includes a step portion located between the connecting portion and the fixing ring, the outer diameter of the step portion is larger than the outer diameter of the connecting portion and smaller than the outer diameter of the fixing ring, the isolation protrusion separates the outer side surface of the pole step portion from the flange, and the upper surface of the flange does not exceed the isolation protrusion.

[0008] Preferably, the annular body of the upper shell extends downwardly by a length exceeding the bottom surface of the fixing ring, and the sealing member is at least partially pressed into the annular body and is limited in position.

[0009] Preferably, the outer edge of the bottom surface of the fixing ring of the pole is recessed upward to form a clamping groove, and the clamping ring body protrudes upward corresponding to the clamping groove to form a limiting convex edge.

[0010] Preferably, the sealing member further comprises an extending cylindrical portion extending downward from the inner edge of the clamping ring body, and the extending cylindrical portion extends to the inner wall surface of the through hole.

[0011] Preferably, the fixing ring and the radial outer surface of the step portion of the pole are provided with an anti-rotation plane, the inner wall surface of the annular body and the inner wall surface of the isolation protrusion are provided with an anti-rotation mating surface matching the anti-rotation plane to prevent rotation between them, the outer side surface of the annular body is protruding to form an anti-rotation block, the side wall of the pole hole is provided with an anti-rotation groove, and the anti-rotation block is stuck in the anti-rotation groove to prevent rotation.

[0012] Preferably, the pole assembly further comprises a gasket disposed on the periphery of the seal, the periphery of the gasket is recessed to form a receiving groove for receiving the lower edge of the annular body, so as to prevent the end of the annular body from collapsing inwards and affecting the seal when pressed down.

[0013] Preferably, the upper surface of the bottom wall is lower than the surface of the cover plate, the side wall is formed by extruding the material on the upper side of the bottom wall, and the flange is formed by bending the upper part of the side wall through a rotary riveting process after the pole assembly is installed. When the flange is rotary riveted, a predetermined pressing force is applied to the pole assembly to squeeze the clamping body and achieve sealing.

[0014] In order to solve the above technical problems, the present application also provides a method for assembling a battery top cover, comprising the following steps:

[0015] S101: Pressing the pole into the upper shell from bottom to top, and fixing the pole and the upper shell by interference fit;

[0016] S102: Pressing the sealing member into the annular body of the upper shell from the lower side and fitting it onto the lower surface of the fixing ring;

[0017] S103: Installing the assembled pole, upper shell and seal into the pole hole, wherein the seal is clamped by the bottom surface of the fixing ring and the bottom wall surface;

[0018] S104: The upper portion of the side wall is riveted radially inward to form a flange pressed onto the covering body, the flange applies sufficient pressing force downward to deform the seal to achieve sealing, and when viewed in the vertical projection direction, the flange at least partially overlaps with the fixing ring.

[0019] In order to solve the above technical problems, the present application also provides a power battery, including the aforementioned battery top cover, a battery shell and a battery cell encapsulated in the battery shell, the battery top cover is installed on the battery shell and seals the battery cell in the battery shell, the battery cell is connected to the lower surface of the pole through a conductive sheet, and the conductive sheet passes through the through hole and is welded to the bottom surface of the pole.

[0020] The battery top cover, assembly method and pole assembly of the power battery of the present application are composed of three independent components: the pole, the upper shell and the seal. The structure is simple, no in-mold injection molding is required, the manufacturing cost can be reduced, and the assembly is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Embodiment 1

[0023] Figure 1 It is a three-dimensional assembly diagram of the battery top cover of Example 1;

[0024] Figure 2It is a three-dimensional exploded view of the battery top cover of Example 1;

[0025] Figure 3 The cover edge of the battery top cover of Example 1 Figure 2 A cross-sectional view of the CC dashed line shown;

[0026] Figure 4 It is a three-dimensional combination diagram of the pole assembly of the first embodiment;

[0027] Figure 5 It is a three-dimensional combination diagram of the pole assembly of the first embodiment from another angle;

[0028] Figure 6 It is a three-dimensional exploded view of the pole assembly of the first embodiment;

[0029] Figure 7 It is a three-dimensional exploded view of the pole assembly of the first embodiment from another angle;

[0030] Figure 8 For along Figure 6 A cross-sectional view of the dashed line DD shown;

[0031] Fig. 9 For along Figure 4 The cross-sectional view shown by the dashed line JJ;

[0032] Fig.10 For along Figure 1 A cross-sectional view taken along the dashed line AA shown;

[0033] Fig.11 For along Figure 1 A cross-sectional view taken along the dashed line BB is shown.

[0034] Embodiment 2

[0035] Fig.12 It is a cross-sectional view of the battery top cover of Example 2.

[0036] Embodiment 3

[0037] Fig.13 This is a three-dimensional exploded view of the battery top cover of Example 3;

[0038] Fig.14 For along Fig.13 The cross-sectional view of the dashed line XX shown;

[0039] Fig.15 It is a cross-sectional view of the battery top cover of Example 3 in an assembled state;

[0040] Embodiment 4

[0041] Fig.16 It is a three-dimensional exploded view of the battery top cover of the fourth embodiment;

[0042] Fig.17For along Fig.16 The cross-sectional view shown by the dotted line YY;

[0043] Fig.18 It is a cross-sectional view of the battery top cover of the fourth embodiment in the assembled state.

[0044] Embodiment 5

[0045] Fig.19 Schematic diagram of the change of the metal plate structure in the top cover sheet forming method of Example 5;

[0046] Fig. 20 It is a diagram showing the structural changes of the metal sheet and the matching of the stamping die in the top cover sheet forming method of the fifth embodiment;

[0047] Fig.21 For along Fig.19 A cross-sectional view of the dashed line EE shown;

[0048] Fig. 22 For along Fig. 20 A cross-sectional view taken along the dashed line FF is shown.

[0049] Embodiment 6

[0050] Fig.23 Schematic diagram of the change of the metal sheet structure in the roof sheet forming method of Example 6;

[0051] Fig.24 It is a diagram showing the structural changes of the metal sheet and the matching of the stamping die in the roof sheet forming method of Example 6;

[0052] Fig.25 For along Fig.23 A cross-sectional view of the dashed line GG shown;

[0053] Fig.26 For along Fig.24 A cross-sectional view of the dashed line HH shown;

[0054] Description of Reference Numerals

[0055] Cover plate-10; pole hole-11; perforation-112; side wall-113; bottom wall-114; bottom wall intermediate body-114'; anti-rotation groove-115; flange-116; plate body-12; explosion-proof opening-13; convex edge-131; liquid injection port-14; pole assembly-20; pole-21; fixing ring-211; step-212; connecting part-213; anti-rotation plane-214, 224; slot-215; upper shell-22; covering body-221; isolation protrusion-222; anti-rotation mating surface-223, 233; buckle structure-225; lower shell-23; annular body-231; anti-rotation block-232; buckle mating structure-234; inner convex ring-235; limiting step-236; sealing member-24, 25; clamping ring body-241; limiting convex edge-242; extension cylinder-243; gasket-26; receiving groove-261; explosion-proof component-30; explosion-proof disk-31; welding edge-311; explosion-proof area-31 2; notch-313; protective cover-32; insulating plate-40; insulating plate body-41; hot melt column-42; connecting hole-43; annular boss-431; metal plate-S; claw mark-111; stamping die-91; positioning die-911; stamping punch-912; punching die-92; upper fixing sleeve-921; lower fixing sleeve-922; punching punch-923; deburring die-93; flanging die-94; upper die sleeve-941; flanging punch-942; Positioning head-943; round head-944; shaping die-95; edge-beating die-96; upper die base-961, 971; edge-beating punch-962; punch extrusion part-964; lower supporting die-963, 973; dividing die-97; dividing punch-972; inner groove-974; pier extrusion die-81; upper die sleeve-811, 821; lower die base-812, 822; pier extrusion punch-813; dividing trough-814; shaping die-82; shaping punch-823. DETAILED DESCRIPTION

[0056] 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.

[0057] 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.

[0058] Embodiment 1

[0059] Figures 1 to 11 It is a schematic diagram of the structure of the pole assembly and the battery top cover of the first embodiment.

[0060] See also Figures 1 to 3As shown, the battery top cover of the first embodiment includes a cover plate 10 provided with a pole hole 11 and an explosion-proof opening 13, a pole assembly 20 inserted into the pole hole 11, an explosion-proof assembly 30 welded to the explosion-proof opening 13, and an insulating plate 60 fixed to the lower side of the cover plate 10.

[0061] The cover plate includes a plate body 12 . The pole hole 11 and the explosion-proof opening 13 penetrate the plate body 12 in a vertical direction. A liquid injection port 14 is also formed through the plate body 12 .

[0062] The pole hole 11 includes a through hole 112 formed by passing through from top to bottom, a bottom wall 114 extending from the plate body 12 along the through hole, a side wall 113 extending upward from the plate body 12 along the periphery of the bottom wall 114, and a flange 116 extending from the top of the side wall 113 to the top of the bottom wall 114. At least one anti-rotation groove 115 is provided on the inner wall surface of the side wall 113. The thickness of the bottom wall 114 is not greater than half of the thickness of the plate body 12, and the bottom surface of the bottom wall 114 protrudes downward from the bottom surface of the plate body 12. The vertical wall 113 extends upward from the upper surface of the plate body 12 and is riveted radially inward at the top to form the flange 116 located above the bottom wall 114. The space formed between the bottom wall 114 and the flange 116 is used to install and fix the pole assembly 20. The inner diameter of the through hole 112 at the bottom wall 114 is smaller than the inner diameter of the through hole 112 at the flange 116. The thickness of the plate body 12 located on the upper side of the bottom wall 114 serves as a part of the side wall 113 .

[0063] The surface periphery of the explosion-proof opening 13 protrudes upward to form a convex edge 131, and the convex edge 131 is a non-planar structure as a whole. The explosion-proof assembly 30 includes an explosion-proof plate 31 and a protective cover 32. The explosion-proof plate 31 includes a welding edge 311, an explosion-proof area 312 formed in the welding edge 311, and a notch 313 formed on the explosion-proof area 312. The thickness of the explosion-proof area 312 is less than the thickness of the welding edge 311. The notch is formed on the explosion-proof area 312 in a certain pattern so that the explosion-proof area 312 explodes and releases pressure when subjected to a given pressure. The explosion-proof plate 31 is welded and fixed to the bottom edge of the explosion-proof opening 13 through the welding edge 311. The protective cover 32 is attached to the convex edge 131 of the explosion-proof opening 13, and the non-planar structure of the convex edge 131 keeps the explosion-proof opening 13 in the protective cover 32 connected to the outside world. The explosion-proof cover 32 can be a protective film.

[0064] The insulating plate 40 includes an insulating plate body 41 covering the lower surface of the plate body 12, a plurality of heat-melting columns 42 protruding upward from the top of the insulating plate body 41, and a connecting hole 43 formed through the corresponding pole hole 11. The edge of the connecting hole 43 protrudes upward to form an annular boss 431. A plurality of blind holes (not shown) are opened on the lower surface of the plate body 12 corresponding to the heat-melting columns 42, and the insulating plate 40 is fixed by heat-melting by inserting the heat-melting columns 42 into the blind holes.

[0065] Please continue reading Figures 4 to 9 As shown, the structural principle of the pole assembly 20 of the first embodiment will be described in detail below.

[0066] The pole assembly 20 of the first embodiment includes a lower shell 23, an upper shell 22, a pole 21 and a seal 24 clamped between the lower shell 23 and the upper shell. The seal 24 is attached to the lower surface of the pole 21.

[0067] The pole 21 includes a fixing ring 211, a step portion 212 protruding upward from the middle of the fixing ring 211, and a connecting portion 213 protruding upward from the step portion 212. The pole 21 is a segmented cylindrical structure, the outer diameter of the fixing ring 211 is larger than the outer diameter of the step portion 212, and the outer diameter of the step portion 212 is larger than the outer diameter of the connecting portion 213. The bottom of the fixing ring 211 protrudes downward from the middle and a slot 215 is formed on the periphery.

[0068] Fig.10 The cross-section of the positive column assembly is shown. Fig.11 The cross-sectional view of the negative pole assembly, the positive pole 21 is made of aluminum, and the negative pole 21 is made of copper-aluminum composite material, that is, the bottom layer of the negative pole 21 is made of the same material, and the upper layer is made of aluminum, and they are fixed together by pressing and other schemes. In one embodiment, if the pole 21 is a negative pole, the fixing ring 211 includes a copper material layer and an aluminum material layer.

[0069] The seal 24 comprises a clamping ring body 241 attached to the outer edge of the lower surface of the fixing ring 211, an extension cylinder 243 integrally extending downward from the inner edge of the clamping ring body 241, and a limiting convex edge 242 protruding upward from the outer edge of the clamping ring body 241. The seal 24 is preferably made of fluororubber material to improve heat resistance and corrosion resistance.

[0070] The lower shell 23 includes an annular body 231, an inner convex ring 235 protruding from the bottom of the annular body 231 toward the center of the circle, and at least one anti-rotation block 232 protruding from the outer periphery of the annular body 231. The inner wall surface of the annular body 231 is provided with at least one anti-rotation plane 233, and the inner wall surface of the annular body 231 is an arc surface. The anti-rotation plane 233 protrudes from the arc surface to form a plane structure. A snap-fit ​​structure 234 is provided on the upper side of the anti-rotation plane 233, and the snap-fit ​​structure 234 is one of a slot or a block. The inner wall surface of the annular body 231 is provided with a limiting step 236 on the upper side of the inner convex ring 235, and the end of the fixing ring 211 of the pole 21 is limited on the limiting step 236 to distinguish the position of the seal 24 and the pole 21 to avoid excessive extrusion of the seal 24 to protect the seal 24 when riveting and extruding the pole assembly 20.

[0071] The upper shell 22 includes a covering body 221 covering the upper surface of the fixing ring 211 of the pole 21, and an isolation protrusion 222 protruding upward from the inner edge of the covering body 221. The upper surface of the isolation protrusion 222 is not lower than the surface of the step portion 212 of the pole 21, and it is a preferred solution that the two are flush. An anti-rotation mating surface 223 is provided on the inner wall surface of the upper shell 22. An anti-rotation plane 224 is provided at the outer edge of the covering body 221 corresponding to the anti-rotation mating surface 233 of the lower shell 23, and the anti-rotation mating surface 233 of the covering body 221 cooperates with the anti-rotation plane 224 to prevent rotation between the two. A snap-fit ​​structure 225 is also provided on the anti-rotation mating surface 223 of the covering body 221, and the snap-fit ​​structure is a snap hook or a snap groove. The snap-fit ​​structure 225 is snapped with the snap-fitting structure 234 of the lower shell 23 to achieve pre-fixation of the two.

[0072] In one embodiment, the upper shell 22 further includes an extended covering portion (not covered) that protrudes inwardly from the isolation protrusion 222 and covers the step portion 212 .

[0073] The pole assembly 20 of the first embodiment can be preassembled into a whole and then installed into the pole hole 11 of the cover plate 10 .

[0074] Specifically, the seal 24 is first installed into the lower shell 23 from above, and the edge of the clamping ring 241 of the seal 24 is limited on the inner convex ring 235; then the pole 21 is installed into the lower shell 23 from above, and the lower surface of the fixing ring 211 of the pole 21 is attached to the upper surface of the clamping ring 241 of the seal 24, and the clamping groove 215 limits the limiting convex edge 242 of the seal 24 along the radial outer side to prevent the seal 24 from deforming and sliding inward. Alternatively, the seal 24 is first attached to the lower surface of the pole 21 and then installed into the lower shell 23 together, which can prevent the seal 24 from shifting and deforming.

[0075] Finally, the upper shell 22 is pressed into the lower shell 23 from above. At this time, the covering body 221 covers the upper surface of the fixing ring 211, and the buckle structure 225 of the upper shell 22 is pre-fixed with the buckle matching structure 235 of the lower shell 23.

[0076] After the pole assembly 20 is assembled, the anti-rotation plane 214 on the fixing ring 211 of the pole 21 cooperates with the anti-rotation mating surface 223 in the lower shell 23 to prevent the pole 21 from rotating in the lower shell 23. The anti-rotation plane 214 outside the step portion 212 of the pole 21 cooperates with the anti-rotation mating surface 223 in the upper shell 22 to prevent rotation between the upper shell 22 and the pole 21. The anti-rotation plane 224 outside the covering body 221 of the upper shell 22 cooperates with the anti-rotation mating surface 233 in the lower shell 23 to prevent rotation between the lower shell 23 and the upper shell 22.

[0077] The upper shell 22 is made of conductive plastic material, such as conductive PPS, and the lower shell 23 is made of insulating plastic. The resistance of the conductive plastic material of the upper shell 22 is between 1-10000 ohms. By using conductive plastic material, the upper shell 22 can effectively reduce the potential difference between the cover plate 10 and the pole 21, avoid electrical corrosion to the cover plate 10 and the pole, and increase the service life of the pole 21 and the cover plate 10. The price of conductive plastic material is two to three times that of insulating plastic material. In this embodiment, the shell is divided into an upper shell 22 and a lower shell 23. The upper shell 22 plays a covering role and the volume and material usage are greatly reduced, while the lower shell 23 plays a containing role and the volume and material usage are relatively large. Compared with the traditional technical solution that uses conductive plastic materials, the material cost can be greatly reduced. Compared with the traditional technical solution that uses conductive plastic materials, the upper shell 22 and the lower shell 23 can save 60%-70% of the cost of conductive plastic materials, effectively improving the market competitiveness of the product.

[0078] At the same time, compared with the traditional pole, the lower side of the pole 21 of the first embodiment does not need to protrude downward, which greatly reduces the thickness of the pole 21, and the material cost of the pole 21 can be reduced by 55%-70%. The pole 21 has a simple structure and can be manufactured using a stamping process without the need for expensive CNC processing technology, which can further reduce the manufacturing cost. At the same time, the space utilization rate is improved, and the product energy density per unit volume can be improved. The upper shell 22, the lower shell 23 and the seal 24 of the first embodiment are all independently injection molded, that is, the pole assembly 20 does not have an in-mold injection molding process, which can reduce the manufacturing cost.

[0079] Most importantly, with the pole assembly 20 of the first embodiment, each component is independent and can be simply assembled, so that it can be standardized. When developing different types of products, the pole assembly can be universalized and different types of cover plates 10 can be newly developed. This reduces the redundancy of the entire industry, speeds up product development, and reduces inventory costs.

[0080] Embodiment 2

[0081] Please continue reading Fig.12 As shown, the second embodiment is an alternative structure of the first embodiment, and the difference is that the lower shell 23 is eliminated, and a sealing member 25 is used to integrate the functions of the original sealing member 24 and the lower shell 23.

[0082] Specifically, the structures of the pole 21 and the upper shell 22 remain unchanged, and the seal 25 includes a covering body 211 covering the lower surface of the fixing ring 211 of the pole 21, an extending cylinder 243 extending downward from the inner edge of the covering body 241, and an annular body 231 extending upward from the outer edge of the covering body 211 and covering the outer edge of the fixing ring 211. The top of the annular body 231 exceeds the upper surface of the fixing ring 211 but does not exceed the upper surface of the step 212.

[0083] During assembly, the seal 25 is wrapped upwardly outside the pole 21, and the thickness of the annular body 231 is greater than the distance between the fixing ring 211 of the pole 21 and the side wall 113 of the pole hole 11 to achieve an interference fit seal after installation. The inner edge of the annular body 231 can also extend toward the center of the circle to form an extended edge covering a portion of the surface of the covering body 221 of the upper shell 22. During assembly, the upper shell 22 is first inserted into the outside of the pole 21, and then the seal 25 is wrapped from bottom to top outside the pole 21 and wraps a portion of the surface of the upper shell 22 to achieve pre-fixation.

[0084] The slot 215 on the lower surface of the pole 21 and the limiting convex edge 242 covering the edge of the main body 241 of the seal 25 can be retained so that the seal 25 will not collapse or shift during the extrusion of the seal 25. The material of the upper shell 22 is the same conductive plastic as that of the first embodiment.

[0085] Compared with the first embodiment, the second embodiment reduces one lower shell 23 component and has a simpler structure. However, the outer periphery of the fixing ring 211 of the pole 21 lacks hard material support, which may cause a risk of slight movement.

[0086] Embodiment 3

[0087] Please continue Figures 13 to 15 As shown, it is a drawing of the third pole assembly 20 and the battery top cover of the embodiment of the present application. The structural principle of the third embodiment of the present application will be introduced in detail below.

[0088] Embodiment 3 is an alternative technical solution to Embodiment 1, the difference being that part of the functional structure of the lower shell 23 is integrated on the upper shell 22, so that the upper shell 22 and the lower shell 23 form an integral structure. Since this component is inserted from above the pole 21, it is still referred to as the upper shell 22 in this embodiment.

[0089] Specifically, the upper shell 22 of the pole assembly 20 of this embodiment includes a covering body 221 covering the upper surface of the fixing ring 211 of the pole 21, an isolation protrusion 222 extending upward from the inner edge of the covering body 221, and an annular body 231 extending downward from the outer edge of the covering body 221 and wrapped around the outer surface of the fixing ring 211. The downward extension length of the annular body 231 exceeds the lower surface of the fixing ring 211. The edge of the clamping ring 241 of the seal 24 is located on the inner side of the annular body 231.

[0090] In one implementation of this embodiment, the slot 215 at the bottom of the pole 21 and the limiting convex edge 242 of the seal 24 can still be retained to limit the position of the seal 24 to prevent it from collapsing inwards after being squeezed.

[0091] Compared with the first embodiment, the present embodiment cancels the lower shell 23, and integrates part of the functions of the lower shell 23 into the upper shell 22, which can make the structure simpler. During assembly, the pole 21 is first pressed into the upper shell 22 in an interference fit manner, and then the seal 24 is installed into the annular body 231 of the upper shell 22 and fits the bottom surface of the fixing ring 211 of the pole 21. The disadvantage is that it causes an increase in the use of conductive plastic materials, which increases the material cost of the product. Similarly, the present embodiment can also be promoted as an industry standard to make all components universal.

[0092] In this embodiment, the annular body 231 of the upper shell 22, the covering body 221 and the inner wall surface of the isolation protrusion 222 still retain the anti-rotation mating surfaces 223, 233 to cooperate with the anti-rotation plane 214 on the pole 21 to prevent the upper shell 22 and the pole 21 from rotating. The annular body 231 retains the anti-rotation block 232 to cooperate with the anti-rotation groove 115 in the pole hole 11 to prevent the pole assembly 20 from rotating in the pole hole 11.

[0093] Embodiment 4

[0094] Please continue reading Figures 16 to 18 As shown, it is a drawing of the fourth pole assembly 20 and the battery top cover of the embodiment of the present application. The structural principle of the fourth embodiment of the present application will be introduced in detail below.

[0095] The fourth embodiment is an improvement and optimization of the technical solution of the third embodiment, and the difference is that a gasket 26 is added, and the outer edge of the gasket 26 is recessed to form a receiving groove 261. The bottom of the annular body 231 of the upper shell 22 is received in the receiving groove 261. The length of the annular body 231 extending downward is correspondingly shortened, and the bottom edge of the fixing ring 211 of the pole 21 is pressed against the upper surface of the gasket 26.

[0096] When the gasket 26 rivets the flange 116 of the pole hole 11 and presses the upper shell 22 downward, it can prevent the annular body 231 of the upper shell 22 from collapsing inwards and pressing the seal 24, thereby preventing the seal 24 from shifting.

[0097] Key References Fig.10 , Fig.11 As shown, the pole assembly 20 introduced in the first to fourth embodiments is finally installed in the pole hole 11 of the cover plate 10, and the seal 24 is clamped between the fixing ring 211 of the pole 21 and the bottom wall 114 of the pole hole 11. The extension barrel 243 extends downward on the inner wall surface of the through hole 112 at the bottom wall 114, and abuts downward against the annular boss 431 of the connecting hole 43 of the insulating plate body 40. The annular boss 431 plays a certain supporting role for the seal 24 to prevent the seal 24 from being squeezed, deformed and extended downward. In one embodiment, the limiting boss 431 can be designed to be inclined toward the center of the circle, so that the extension barrel 243 of the seal 24 is located between the limiting boss 431 and the inner wall surface of the through hole 112.

[0098] Subsequently, the top of the side wall 113 of the pole hole 11 is riveted toward the center of the circle to form a flange 116 that presses the covering body 221 of the upper shell 22 downward, and the clamping body 241 of the seal 24 between the fixing ring 211 and the bottom wall 114 is squeezed and sealed. In the vertical projection direction, the outer edge of the fixing ring 211 at least partially overlaps with the flange 116. The flange 116, the isolation protrusion 222 and the surface of the step portion 212 are flush.

[0099] After the pole assembly 20 of the first and second embodiments is inserted into the pole hole 11 and riveted, the limiting convex edge 242 of the seal 24 is limited radially outward by the groove 215 at the bottom of the fixing ring 211 to prevent the seal 24 from collapsing toward the center of the circle.

[0100] It should be noted that the pole assembly 20 of the first to fourth embodiments can also be applied to the cover plate 10 using the welding ring, such as the patent application number 202110666517.4 previously applied by the applicant, and the pole assembly 20 can also be applied therein. This can greatly increase the versatility of the pole assembly 20 of the present application and make it a universal standard.

[0101] The battery cover of the present application is used for a power battery, which further includes a battery housing, a battery cell encapsulated in the battery housing, a battery cover that seals the battery cell in the battery housing, and a conductive sheet connecting the pole 21 and the battery cell. Specifically, the conductive sheet is welded to the lower surface of the middle part of the fixing ring 211 of the pole 21 through the connection hole 43 of the insulating plate body 40 under the battery cover.

[0102] The pole assemblies 20 in the embodiments of the present application are all cylindrical in structure. In other embodiments, square poles are still within the protection scope of the present application.

[0103] Embodiment 5

[0104] Please continue reading Figures 19 to 22 As shown, the fifth embodiment mainly introduces the forming process of the pole hole 11 of the cover plate 10.

[0105] This embodiment uses Fig.19 The Y direction is the longitudinal direction, the X direction is the lateral direction, and the Z direction is the vertical direction upward.

[0106] The cover plate forming method of this embodiment mainly includes the following steps:

[0107] S101, providing a metal sheet S, and punching a ring-shaped claw mark 111 at a predetermined position of the metal sheet S;

[0108] This step is not necessary. In different embodiments, the claw mark in this step may not be punched. The claw mark 111 is used to increase the bonding force with the molded plastic in some in-mold injection molding solutions.

[0109] The claw marks 111 are stamped on both sides of the metal sheet S in the transverse direction, corresponding to the positive and negative poles of the pole hole 11. In some embodiments, such as blade batteries, only one annular claw mark 11 needs to be formed in the transverse direction of the metal sheet S.

[0110] In this step, the stamping die 91 is used to achieve the above. The stamping die 91 includes a positioning die 911 that is pressed on the surface of the metal sheet S in a cylindrical shape and a stamping punch 912 that strikes the metal sheet S downward from a plurality of hole structures provided in the positioning die 911 to form the claw marks. Specifically, the periphery of the positioning die 911 is provided with a plurality of hole structures distributed in an annular pattern, and the stamping punch 912 stamps downward from the hole structures to form the claw marks.

[0111] S102, punching a perforation 112 in the middle of the claw mark 111 of the metal sheet S;

[0112] In this step, a perforation 112 is punched in the middle of the annular claw mark 111 by a punching die 92 . The perforation 112 is co-centered with the annular claw mark 111 , and there is a certain distance between the edge of the perforation 112 and the claw mark 111 .

[0113] The punching die 92 includes a lower fixing sleeve 922 which is hollow and supported on the lower surface of the metal plate S, an upper fixing sleeve 921 which corresponds to the lower fixing sleeve 922 and is hollow and pressed on the upper surface of the metal plate S, and a punch 923 which is sleeved in the upper fixing sleeve 921. The punch 923 punches downward to cut off a portion of the metal plate S at a predetermined position and form the through hole 112.

[0114] S103, deburring the perforations formed by stamping;

[0115] This step is mainly to remove the burrs formed during the punching process of step S102. This step is not necessary and can be cancelled depending on product quality, stamping process improvement, etc. In this step, a deburring die 93 is used to remove burrs and other substances to avoid subsequent short circuits.

[0116] S104, flanging the metal plate S around the perforation 112 upward to form a side wall 113 extending upward;

[0117] The amount of flanging in this step is determined by the product size specifications. The flanging operation in this step is achieved using a flanging die 94. Specifically, the flanging die 94 includes a hollow upper die sleeve 941, a positioning head 943 sleeved in the upper die sleeve 941, and a flanging punch 942 that bends the periphery of the perforation 112 upward from the lower side of the metal sheet S. Initially, the middle of the bottom surface of the positioning head 943 protrudes downward to form a head 945 that extends into the perforation 112, and the head 945 is beneficial to protecting the edge of the perforation 112. The top edge of the flanging punch 942 is an arc structure to avoid damaging the metal sheet S when flanging upward.

[0118] During the flanging operation, the head 945 of the positioning head 943 is inserted downward into the perforation 112 to protect the edge of the perforation 112, and the flanging punch 942 presses the metal sheet S upward, and the flanging punch 942 and the perforation 112 are co-centered. There is a gap between the outer side surface of the flanging punch 942 and the inner wall surface of the upper die sleeve 941 to accommodate the side wall 113 bent upward. When the flanging punch 942 moves upward, it first contacts the head 945 of the positioning head 943 and pushes the positioning head 943 upward, and then begins to press the metal sheet S upward until the metal sheet S at the periphery of the perforation 112 is pressed upward to form the side wall 113. At this time, the side wall 113 preferably has a certain inclination angle, specifically, the side wall 113 is inclined at a small angle toward the center of the circle.

[0119] S105, shaping the side wall 113 around the through hole 112;

[0120] This step mainly reshapes the side wall 113 to make it vertical. The operation is mainly performed by the shaping die 95, which limits the peripheral position of the side wall 113 through a positioning sleeve (not numbered) surrounding the periphery of the side wall 113, and then a shaping head (not numbered) is inserted between the side walls 113 to squeeze the side wall 113 outward to make it in a 90-degree vertical state.

[0121] S106, shaping and edge-cutting the side wall 113 so that the side wall 113 reaches a predetermined shape;

[0122] This step mainly involves shaping the flatness of the top surface of the side wall 113 and the thickness at each position. The side wall 113 is made to reach a predetermined shape structure. Specifically, the process of this step is carried out through a beating die 96, and the beating die 96 includes a hollow upper die base 961, a beating punch 962 inserted into the upper die base 961, and a lower support die 963. The middle part of the bottom surface of the beating punch 962 protrudes downward to form a punch extrusion part 964, and a gap for accommodating the side wall 113 is formed between the outer periphery of the punch extrusion part 964 and the inner wall surface of the upper die base 961, and the height of the gap is the predetermined height of the side wall 113.

[0123] When edge beating, the edge beating punch 962 is used to press downwards, so that the metal flow of the side wall 113 is generated and made uniform, and the height at each position is kept consistent.

[0124] S107, dividing the side wall 113 to form a horizontal bottom wall 114;

[0125] In this step, a portion of the inner wall thickness of the side wall 113 is extruded downward to form the horizontal bottom wall 114. After this step, the thickness of the side wall 113 is reduced by more than half, that is, more than half of the material inside the side wall 113 is extruded to form the bottom wall 114. At the same time, the thickness of the bottom wall 114 is greater than the thickness of the side wall 113.

[0126] This step uses a material dividing die 97 for operation, and the material dividing die 97 includes a hollow upper die base 971, a lower die base 973, and a material dividing punch 972 inserted into the upper die base 971. The middle part of the top surface of the lower die base 973 is recessed downward to a certain position, and the recessed position is located outside the material dividing position of the side wall 113, but does not exceed the outer wall surface of the side wall 113, so that the bottom wall 114 protrudes downward a little distance to form a protruding surface T. An inner groove 974 is formed on the outer edge of the lower side of the material dividing punch 972, and the distance between the inner groove 974 and the inner wall surface of the upper die base 971 is the thickness of the side wall 113 after the material is divided.

[0127] In another embodiment, the material dividing die 97 of the present application is improved to form a complete perforation 112 while dividing the material. At this time, according to the inner diameter of the perforation 112, the bottom surface of the lower die base 973 and the material dividing punch 972 are respectively provided with mutually matched holes and boss structures, so that the metal material extruded downward is limited to the periphery of the boss. The boss is arranged as an inclined surface so that it can be easily inserted into the hole. Preferably, the boss is arranged on the bottom surface of the material dividing punch 972, and the hole is arranged in the lower die base 972. Of course, the positions of the boss and the hole can be interchanged. At this time, the thickness of the material dividing can be controlled to form a complete bottom wall 114 and the perforation 112 in one stamping.

[0128] S108, cutting the metal plate S into a plurality of cover plate units in a transverse direction;

[0129] This step is to cut the plurality of pole holes 11 continuously punched from the metal sheet S into a plurality of independent cover plate 10 units. In this embodiment, each cover plate 10 unit includes two pole holes 11 distributed in the longitudinal direction. Fig.23 The dotted line C shown cuts the metal sheet S into a plurality of cover plate 10 units.

[0130] In the fifth embodiment, the pole hole 11 of the cover plate 10 is formed by stamping, and the side wall 113 is then riveted and bent to fix the pole assembly 20, thereby avoiding the need to use a separate formed welding ring to weld and fix the pole assembly 20 in the prior art, greatly reducing costs, and having a simple structure and easy assembly.

[0131] Embodiment 6

[0132] Please continue reading Figure 23 to Figure 26 As shown, the sixth embodiment mainly introduces another molding process of the pole hole 11 of the cover plate 10.

[0133] The cover plate forming method of this embodiment mainly includes the following steps:

[0134] S201, providing a metal sheet S, and extruding a predetermined area of ​​the metal sheet S to thin the area and force excess metal to flow upward to form a side wall 113, while forming a thinned bottom wall 114;

[0135] In this step, the operation is achieved through an irritation die 81 . Specifically, the irritation die 81 includes a lower die base 812 with a flat surface, a hollow upper die sleeve 811 , and an irritation punch 813 inserted into the upper die sleeve 811 .

[0136] The lower die seat 812 is supported on the bottom surface at the corresponding position of the metal plate S, the upper die sleeve 811 is hollow and pressed on the upper surface at the corresponding position of the metal plate S, and the lower side of the hollow cavity of the upper die sleeve 811 is recessed along the radial outer side to form a material dividing groove 814, and the height of the material dividing groove 814 is greater than the required height of the side wall 113. The middle position of the piercing punch 813 protrudes downward, and the outer diameter of the protruding part is not greater than the inner diameter of the through hole 112.

[0137] In this step, the wall thickness of the side wall 113 in the vertical direction is not necessarily uniform, and can be designed to be thicker at the bottom and thinner at the top.

[0138] In another embodiment, the dividing groove 814 can also be arranged on the lower periphery of the extrusion punch 813, while the hollow inner wall surface of the upper die base 811 remains flat; or the dividing groove 814 is formed by combining the upper die base 811 and the extrusion punch 813.

[0139] During the extrusion process of this step, the protruding portion in the middle of the extrusion punch 813 first presses the predetermined position of the metal sheet S downward, causing the metal at this position to flow radially outward and become thinner, and then continues to extrude downward. The lower surface of the extrusion punch 813 completely extrudes the metal sheet S at the corresponding position. At this time, the metal at this position flows radially outward and finally grows along the dividing groove 814 to form the side wall 113 and the bottom wall 114 at the same time. The protruding portion in the middle of the bottom wall 114 corresponding to the extrusion punch 813 forms a bottom wall intermediate 114' that is thinner than the bottom wall 114.

[0140] S202, shaping the bottom wall 114 and the side wall 113;

[0141] In this step, the irregular positions of the bottom wall 114 and the side wall 113 are shaped to achieve a predetermined thickness and shape.

[0142] This step is operated by the shaping die 82, and the shaping die 82 includes a lower die seat 822, an upper die sleeve 822 and a shaping punch 823 inserted into the upper die sleeve 823. Similar to the pier extrusion die 81, the upper die sleeve 822 and the shaping punch 823 form a shaping groove 824 at the position corresponding to the side wall 113. The shaping groove 824 is formed by the outer surface of the hollow cavity of the upper die sleeve 821 being concave outward and the outer surface of the shaping punch 823 being concave inward. Such a design can avoid the side wall 113 from being divided again when the shaping punch 823 is pressed downward for shaping, and the side wall 113 thick at the bottom and thin at the top in step S201 is also to reduce this risk. The middle part of the bottom surface of the shaping punch 823 also protrudes downward to form a protruding part to further make the thickness of the bottom wall 114 reach a predetermined thickness and ensure the flatness of the bottom wall 114. The height of the shaping groove 824 is consistent with the predetermined height of the side wall 113. After this step, the surface of the side wall 113 will be shaped and leveled and the thickness of the side wall 113 will be consistent.

[0143] A recessed space is formed in the middle of the lower die seat 822 corresponding to the side wall 113 , so that the bottom wall 114 slightly bulges downward to form a convex surface T.

[0144] S203, cutting off the middle portion of the bottom wall 114 to form a through hole 112;

[0145] This step can be achieved by a simple stamping die, and the corresponding die structure is not shown in the figure. Specifically, the bottom wall intermediate body 114 ′ is cut to form the through hole 112 .

[0146] S204, cutting the metal plate S into a plurality of cover plate units in a transverse direction;

[0147] This step is to cut the plurality of pole holes 11 continuously punched from the metal sheet S into a plurality of independent cover plate 10 units. In this embodiment, each cover plate 10 unit includes two pole holes 11 distributed in the longitudinal direction. Fig.26 The dotted line C shown cuts the metal sheet S into a plurality of cover plates 10. The cutting equipment is relatively simple and is not shown in the figure. The cutting step can be set in a continuous stamping equipment with the aforementioned operation process, and completed through continuous operation. One stamping action can complete each stamping process, which can effectively improve the stamping efficiency.

[0148] In the sixth embodiment, the pole hole 11 of the cover plate 10 is formed by stamping, and the side wall 113 is bent by riveting to fix the pole assembly 20, avoiding the need to use a separate formed welding ring to weld and fix the pole assembly 20 in the prior art, greatly reducing the cost, and the structure is simple and the assembly is simple. Compared with the forming method of the fifth embodiment, the steps of this embodiment are simpler, the stamping equipment is simpler, and the efficiency can be effectively improved and the cost can be reduced.

[0149] 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.

[0150] 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 battery top cover, characterized in that: It includes a cover plate provided with a pole hole and a pole assembly assembled in the pole hole, the pole hole includes a through hole, a bottom wall formed at the periphery of the through hole and a side wall protruding upward from the periphery of the bottom wall, the pole assembly includes a pole, a seal and an upper shell, the pole includes a fixing ring and a connecting portion protruding upward from the middle of the fixing ring, the upper shell includes a covering body covering the upper surface of the fixing ring, an isolation protrusion protruding upward from the inner edge of the covering body and an annular body extending downward from the outer edge of the covering body to cover the outer side of the fixing ring, the seal is clamped between the fixing ring and the bottom wall, and the side wall is folded inward to form a pressing The flange of the covering body; the upper shell is made of conductive plastic material, the side wall is extruded by the material on the upper side of the bottom wall, the flange is formed by bending the upper part of the side wall by a rotary riveting process after the pole assembly is installed, and a predetermined pressing force is applied to the pole assembly during rotary riveting to extrude the clamping body and achieve sealing; the seal includes a clamping ring body that is at least partially pressed into the annular body and limited; the pole assembly also includes a gasket placed on the periphery of the seal, and the periphery of the gasket is recessed to form a receiving groove for receiving the lower edge of the annular body to prevent the end of the annular body from collapsing inward and affecting the seal.

2. The battery top cover according to claim 1, characterized in that: The resistance of the conductive plastic is between 1-10000 ohms.

3. The battery top cover according to claim 2, characterized in that: The pole also includes a step portion located between the connecting portion and the fixing ring, the outer diameter of the step portion is larger than the outer diameter of the connecting portion and smaller than the outer diameter of the fixing ring, the isolation protrusion separates the outer side surface of the step portion from the flange, and the upper surface of the flange does not exceed the isolation protrusion.

4. The battery top cover according to claim 3, characterized in that: The length of the annular main body of the upper shell extending downward exceeds the bottom surface of the fixing ring.

5. The battery top cover according to claim 4, characterized in that: The outer edge of the bottom surface of the fixing ring of the pole is recessed upward to form a clamping groove, and the clamping ring body is protruded upward corresponding to the clamping groove to form a limiting convex edge.

6. The battery top cover according to claim 5, characterized in that: The sealing member further comprises an extending tube portion extending downward from the inner edge of the clamping ring body, wherein the extending tube portion extends to the inner wall surface of the through hole.

7. The battery top cover according to claim 6, characterized in that: The fixing ring of the pole and the radial outer surface of the step portion are provided with an anti-rotation plane, the inner wall surface of the annular body and the inner wall surface of the isolation protrusion are provided with an anti-rotation mating surface matching the anti-rotation plane, the outer side surface of the annular body is protruding to form an anti-rotation block, the side wall of the pole hole is provided with an anti-rotation groove, and the anti-rotation block is stuck in the anti-rotation groove to prevent rotation.

8. A method for assembling a battery top cover as claimed in any one of claims 1 to 7, characterized in that: The steps include: S101: Pressing the pole into the upper shell from bottom to top, and fixing the pole and the upper shell by interference fit; S102: Pressing the sealing member into the annular body of the upper shell from the lower side and fitting it onto the lower surface of the fixing ring; S103: Installing the assembled pole, upper shell and seal into the pole hole, wherein the seal is clamped by the bottom surface of the fixing ring and the bottom wall surface; S104: The upper portion of the side wall is riveted radially inward to form a flange pressed onto the covering body, the flange applies sufficient pressing force downward to deform the seal to achieve sealing, and when viewed in the vertical projection direction, the flange at least partially overlaps with the fixing ring.

9. A power battery, characterized in that: It comprises a battery top cover, a battery shell and a battery cell encapsulated in the battery shell as described in any one of claims 1 to 7, wherein the battery top cover is installed on the battery shell and seals the battery cell in the battery shell, the battery cell is connected to the lower surface of the pole through a conductive sheet, and the conductive sheet passes through the through hole and is welded to the bottom surface of the pole.

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