CN116984534A

CN116984534A - Cover plate forming method and battery top cover

Info

Publication number: CN116984534A
Application number: CN202310821426.2A
Authority: CN
Inventors: 田刚; 王理栋; 李亚勇; 杜秋文; 刘潇龙; 黄朝兵
Original assignee: Shenzhen Everwin Precision Technology Co Ltd
Current assignee: Shenzhen Everwin Precision Technology Co Ltd
Priority date: 2023-07-05
Filing date: 2023-07-05
Publication date: 2023-11-03

Abstract

A cover plate forming method comprises the following steps: s201, providing a metal sheet, extruding a preset area of the metal sheet, thinning the area and forcing excessive metal to flow upwards to form a side wall, and forming a thinned bottom wall in the area; s202, shaping the bottom wall and the side wall; s203, cutting off the middle part of the bottom wall to form a perforation and finally obtaining the cover plate with the pole column hole. The application also includes a battery top cover.

Description

Cover plate forming method and battery top cover

Technical Field

The application relates to the field of power batteries, in particular to a cover plate forming method and a battery top cover.

Background

The battery technology is widely applied to electric locomotives, creates great economic benefits for society, and is beneficial to environmental protection and emission reduction. The most important properties for a battery for vehicles include safety, energy density, impact resistance, etc. The power battery comprises a plurality of battery cells, and each battery cell is connected in series-parallel connection to form a powerful vehicle battery pack. Each battery unit comprises a battery shell, an electric core encapsulated in the battery shell, electrolyte and a battery top cover for sealing the battery shell. The battery cells have various forms, and most commonly used in the market include cylindrical batteries, prismatic batteries, and blade batteries. Although the battery has various shapes, the product components have consistent construction principle and all comprise components such as a shell, a top cover and the like.

The patent application 201911418867.8 of the people's republic discloses a power battery top cover structure, which comprises a cover plate provided with a pole hole, a pole and an encapsulation piece formed on the periphery of the pole. The utility model discloses a pole, including the apron, the apron is last the shaping has the pole hole, the pole hole is formed with the vertical wall of lower step and initial state non-vertical outer wall, the pole includes the bulge loop, the rubber coating piece extends to bulge loop lower surface periphery, bulge loop bottom surface edge with lower step passes through the rubber coating piece contacts, the rubber coating piece covers equally the bulge loop upper surface, the pole is packed into in the pole hole after, through spin riveting the vertical wall upside, make the vertical wall upper end inwards bend and form the suppression the turn-ups of bulge loop upper surface thereby fix the pole. The comparison document simplifies the product structure, but the pole hole forming process of the cover plate is difficult; the rubber coating piece with post in-mold forming, the cost of moulding plastics is higher, and the rubber coating piece is to realize sealedly, and it must adopt flexible material such as silica gel, and both sides are flexible material crimping about the post promptly, and the steadiness appears the problem easily, and the material cost is higher. The rubber coating piece and the pole are integrally formed, so that the universality is poor.

Disclosure of Invention

In view of this, it is necessary to provide a cover plate molding method and a battery top cover that realize an unconventional cover plate post hole by a stamping process.

In order to solve the technical problems, the application provides a cover plate forming method, which comprises the following steps:

s201, providing a metal sheet, extruding a preset area of the metal sheet, thinning the area and forcing excessive metal to flow upwards to form a side wall, and forming a thinned bottom wall in the area;

s202, shaping the bottom wall and the side wall;

s203, cutting off the middle part of the bottom wall to form a perforation and finally obtaining the cover plate with the pole column hole.

Preferably, in step S201, the selected area of the metal plate is the area where the pole hole is located, and the thinned metal on the upper layer of the metal plate flows to form the side wall.

Preferably, step S201 implements the operation through a pier extruding die, where the pier extruding die includes a lower die holder with a flat surface, a hollow upper die sleeve, and a pier extruding punch inserted into the upper die sleeve, the lower die holder is supported on the bottom surface of the metal plate corresponding position, the upper die sleeve is hollow and is pressed on the upper surface of the metal plate corresponding position, and a distributing groove is formed by recessing the lower side of the hollow cavity of the upper die sleeve radially outwards, the height of the distributing groove is greater than the height required by the side wall, the middle position of the pier extruding punch protrudes downwards, and the outer diameter of the protruding part is not greater than the inner diameter of the perforation.

Preferably, the wall thickness of the side wall obtained in step S201 is in a state of being thick at the bottom and thin at the top, the middle protruding portion of the upsetting punch presses the metal plate at a predetermined position downwards, so that the metal at the position flows radially outwards to be thinned, the metal plate at the corresponding position is continuously pressed downwards, at this time, the metal at the position flows radially outwards and finally grows along the material dividing groove to form the side wall, the bottom wall is formed at the same time, and the middle of the bottom wall corresponding to the protruding portion of the upsetting punch forms a bottom wall intermediate body thinner than the bottom wall.

Preferably, step S202 is performed by a shaping die, where the shaping die includes a lower die holder, an upper die sleeve, and a shaping punch inserted into the upper die sleeve, the upper die sleeve and the shaping punch are formed with a shaping groove at positions corresponding to the side walls, the shaping groove is formed by combining an outward recess of an inner wall surface of a hollow cavity of the upper die sleeve with an inward recess of an outer surface of the shaping punch, and a height of the shaping groove is consistent with a predetermined height of the side walls.

Preferably, in step S202, a concave space is formed in the middle of the lower die holder corresponding to the side wall, so that the bottom wall protrudes downward and forms a protruding surface.

Preferably, in step S203, the cut-out portion is the thinner bottom wall intermediate.

Preferably, after step S203, the method further includes a step of cutting the metal plate into cover plate units, each cover plate unit including at least one of the pole holes.

In order to solve the technical problem, the application also provides a battery top cover, which comprises a cover plate molded by the process and a pole assembly fixed in the cover plate, wherein the pole assembly comprises a pole, an upper shell covered on the upper surface of the pole part and a sealing piece attached to the lower surface of the pole, the sealing piece is clamped between the bottom wall and the lower surface of the pole, and the side wall is bent inwards to be pressed on the upper shell and applies downward pressure to deform the sealing piece to realize sealing.

Preferably, the upper shell is made of conductive plastic material, and the resistance value of the conductive plastic is 1-

10000 ohms.

Preferably, the post includes solid fixed ring, from the connecting portion that upwards protrudes in the middle of the solid fixed ring and form in the step portion between connecting portion and the solid fixed ring, the external diameter of step portion is greater than the external diameter of connecting portion just is less than the external diameter of solid fixed ring, the post subassembly is still including the parcel gu fixed ring lateral surface's inferior valve, the inferior valve adopts insulating plastic to make, the inferior valve includes annular main part, from annular main part inner wall face towards radial inboard spacing step that protrudes formation, the epitheca includes cover main part and the follow that cover main part inner edge upwards extends the isolation bulge that forms, the isolation bulge covers the lateral surface of step portion, will gu fixed ring is pressed in the inferior valve, gu fixed ring lower surface outer edge limit is located spacing step is last, the epitheca down detains in the inferior valve and fix the post in inferior valve and epitheca, connecting portion surpasses the cover main part upwards.

According to the cover plate forming method and the battery top cover, the pole hole of the cover plate is formed in a stamping mode, and the side wall is bent through integral riveting to fix the pole assembly, so that the situation that in the prior art, a separate forming welding ring is needed to fix the pole assembly in a welding mode is avoided, the cost is greatly reduced, the structure is simple, and the assembly is simple. Compared with the molding method of the fifth embodiment, the method of the fifth embodiment has simpler steps, simpler stamping equipment, effectively improved efficiency and reduced cost.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

example 1

FIG. 1 is a perspective view of a battery top cover according to an embodiment;

FIG. 2 is an exploded perspective view of a battery top cover according to an embodiment;

FIG. 3 is a cross-sectional view of a cover plate of a battery top cover of an embodiment taken along the dashed line C-C shown in FIG. 2;

FIG. 4 is a perspective view of a pole assembly according to an embodiment;

FIG. 5 is a perspective view of another angle of a pole assembly according to an embodiment;

FIG. 6 is an exploded perspective view of a pole assembly according to an embodiment;

FIG. 7 is an exploded perspective view of an alternative angle of a pole assembly according to an embodiment;

FIG. 8 is a cross-sectional view taken along the line D-D of FIG. 6;

FIG. 9 is a cross-sectional view taken along the dashed line J-J of FIG. 4;

FIG. 10 is a cross-sectional view taken along the line A-A of FIG. 1;

fig. 11 is a sectional view taken along the broken line B-B shown in fig. 1.

Example two

Fig. 12 is a cross-sectional view of a top cap of a secondary battery of the embodiment.

Example III

Fig. 13 is an exploded perspective view of the top cover of the three-cell of the embodiment;

FIG. 14 is a cross-sectional view taken along the dashed line X-X in FIG. 13;

fig. 15 is a sectional view of the three-cell top cover in a combined state according to the embodiment;

example IV

Fig. 16 is an exploded perspective view of the top cap of the fourth battery of the embodiment;

FIG. 17 is a cross-sectional view taken along the dashed line Y-Y in FIG. 16;

fig. 18 is a sectional view of the four-cell top cover in a combined state according to the embodiment.

Example five

FIG. 19 is a schematic view showing a variation of the structure of a metal plate in the method for forming a five-top cover sheet according to the embodiment;

FIG. 20 is a diagram showing the structure of a metal plate and the cooperation of a stamping die in the method for forming a five-top cover sheet according to the embodiment;

FIG. 21 is a cross-sectional view taken along the line E-E of FIG. 19;

fig. 22 is a cross-sectional view taken along the dashed line F-F shown in fig. 20.

Example six

FIG. 23 is a schematic view showing a variation of the structure of a metal plate in the sixth header sheet forming method of the embodiment;

FIG. 24 is a diagram showing the structure of a sheet metal material and the cooperation of a stamping die in the method for forming a six-top cover sheet according to the embodiment;

FIG. 25 is a cross-sectional view taken along the dashed line G-G of FIG. 23;

FIG. 26 is a cross-sectional view taken along the line H-H of FIG. 24;

description of the reference numerals

A cover plate-10; a post hole-11; perforation-112; a sidewall-113; a bottom wall-114; a bottom wall intermediate-114'; anti-rotation groove-115; flanging-116; a plate body-12; explosion-proof port-13; convex edge-131; a liquid injection port-14; a pole assembly-20; a pole-21; a retaining ring-211; a step-212; a connection portion-213; anti-rotation planes-214, 224; card slot-215; an upper shell-22; covering the body-221; isolation bumps-222; anti-rotation mating surfaces-223, 233; a snap-fit structure-225; a lower shell-23; an annular body-231; anti-rotation block-232; snap-fit structure-234; inner convex ring-235; limit step-236; seals-24, 25; a clamp ring body-241; a limit convex edge-242; extending the cylinder-243; a spacer-26; an accommodation groove-261; an explosion-proof component-30; explosion-proof sheet-31; welding edges-311; explosion-proof area-312; score-313; a protective cover-32; an insulating plate-40; an insulating plate body 41; a hot melt column-42; a connection hole-43; an annular boss-431; sheet metal-S; claw print-111; a stamping die-91; positioning a die-911; stamping punch-912; punching a die-92; the upper fixing sleeve-921; a lower retaining sleeve-922; punching punch head-923; a deburring die-93; a flanging die-94; upper die sleeve-941; flanging punch-942; positioning head-943; round head-944; shaping mold-95; edge beating mold-96; upper die base-961, 971; edge beating punch heads-962; punch press-964; lower support die-963, 973; a material distribution die-97; a material distributing punch head-972; inner groove-974; pier extruding mould-81; upper mold sleeves-811, 821; lower die holder-812,822; upsetting punch-813; a material dividing groove-814; shaping mold-82; shaping punch-823.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application.

The application takes the X direction as the transverse direction, the Y direction as the longitudinal direction and the Z direction as the vertical direction shown in figure 1.

Example 1

Fig. 1 to 11 are schematic structural views of a pole assembly and a battery top cover according to a first embodiment.

Referring to fig. 1 to 3, a battery top cover of the present embodiment includes a cover plate 10 having a post hole 11 and an explosion-proof opening 13, a post assembly 20 installed in the post hole 11, an explosion-proof assembly 30 welded on the explosion-proof opening 13, and an insulating plate 60 fixed on the lower side of the cover plate 10.

The cover plate comprises a plate body 12, the pole hole 11 and the explosion-proof opening 13 penetrate through the plate body 12 in the vertical direction, and a liquid injection opening 14 is formed in the plate body 12 in a penetrating manner.

The post hole 11 includes a through hole 112 formed by penetrating up and down, a bottom wall 114 formed by extending from the plate body 12 along the through hole, a side wall 113 formed by extending from the plate body 12 upwards along the periphery of the bottom wall 114, and a flange 116 bent from the top of the side wall 113 and extending above the bottom wall 114. At least one anti-rotation groove 115 is formed on the inner wall surface of the side wall 113. The thickness of the bottom wall 114 is not greater than half the thickness of the plate 12, and the bottom surface of the bottom wall 114 protrudes downward from the bottom surface of the plate 12. The vertical wall 113 extends upwardly beyond the upper surface of the plate body 12 and is swaged radially inwardly at the top to form the flange 116 above the bottom wall 114, and a space is formed between the bottom wall 114 and the flange 116 for mounting and securing the pole assembly 20. The inner diameter of the perforations 112 at the location of the bottom wall 114 is smaller than the inner diameter of the perforations 112 at the location of the cuffs 116. The thickness of the plate body 12 at the upper side of the bottom wall 114 is used as a part of the side wall 113.

The periphery of the surface of the explosion-proof opening 13 is provided with a convex edge 131 in an upward protruding mode, and the whole convex edge 131 is of a non-planar structure. The explosion-proof assembly 30 comprises an explosion-proof sheet 31 and a protective cover 32, wherein the explosion-proof sheet 31 comprises 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 smaller than that of the welding edge 311, and the notch is formed on the explosion-proof area 312 in a certain rule so that the explosion-proof area 312 bursts to release pressure when bearing a given pressure. The explosion-proof piece 31 is welded and fixed on the edge of the bottom surface of the explosion-proof opening 13 by the welding edge 311, the protective cover 32 is attached to the protruding edge 131 of the explosion-proof opening 13, and the non-planar structure of the protruding edge 131 enables the explosion-proof opening 13 in the protective cover 32 to be communicated with the outside, and the explosion-proof opening 32 can be a protective film.

The insulating plate 40 includes an insulating plate body 41 covering the lower surface of the plate body 12, a plurality of hot melt posts 42 protruding upward from the top of the insulating plate body 41, and connection holes 43 penetrating the corresponding post holes 11. The edge of the connecting hole 43 is formed with an annular boss 431 protruding upward. The lower surface of the plate body 12 is provided with a plurality of blind holes (not shown) corresponding to the hot-melt columns 42, and the insulating plate 40 is plugged into the blind holes through the hot-melt columns 42 and fixed by hot-melt.

With continued reference to fig. 4-9, the structural principles of the pole assembly 20 according to the embodiment will be described in detail.

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

The pole 21 includes a fixing ring 211, a step portion 212 formed to protrude upward from the middle of the fixing ring 211, and a connection portion 213 formed to protrude upward from the step portion 212. The pole 21 has 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 middle of the bottom surface of the fixing ring 211 protrudes downwards and is provided with a clamping groove 215 at the periphery.

Fig. 10 is a cross-sectional view of a positive electrode column assembly, fig. 11 is a cross-sectional view of a negative electrode column assembly, the positive electrode column 21 is made of aluminum, the negative electrode column 21 is made of copper-aluminum composite, namely, the bottom layer of the negative electrode column 21 is made of the same material, and the upper layer is made of aluminum, and the positive electrode column and the negative electrode column are fixed together through pressing schemes. In one embodiment, if the electrode post 21 is a negative electrode post, the fixing ring 211 includes a copper layer and an aluminum layer.

The sealing member 24 includes a clamping ring body 241 attached to the outer edge of the lower surface of the fixing ring 211, an extending cylinder 243 integrally extending downward from the inner edge of the clamping ring body 241, and a limiting flange 242 protruding upward from the outer edge of the clamping ring body 241. The seal 24 is preferably a fluororubber material to promote heat and corrosion resistance.

The lower case 23 includes an annular body 231, an inner convex ring 235 protruding from the bottom of the annular body 231 toward the center direction, and at least one anti-rotation block 232 protruding from the outer circumference of the annular body 231. At least one rotation preventing plane 233 is disposed on the inner wall surface of the annular main body 231, the inner wall surface of the annular main body 231 is an arc surface, and the rotation preventing plane 233 protrudes on the arc surface to form a plane structure. The anti-rotation plane 233 is provided with a snap-fit structure 234 on the upper side, and the snap-fit structure 234 is one of a clamping groove or a clamping block. The inner wall surface of the annular main body 231 is provided with a limiting step 236 above 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 sealing member 24 from the position of the pole 21, so that excessive extrusion of the sealing member 24 is avoided to protect the sealing member 24 when the pole assembly 20 is extruded by riveting.

The upper case 22 includes a cover body 221 covering the upper surface of the fixing ring 211 of the pole 21, and a separation protrusion 222 protruding upward from the inner edge of the cover body 221. The upper surface of the isolation protrusion 222 is not lower than the surface of the step 212 of the pole 21, and it is preferable that the upper surface and the surface are flush. The inner wall surface of the upper case 22 is provided with an anti-rotation mating surface 223. An anti-rotation plane 224 is disposed at the outer edge of the cover main body 221 corresponding to the anti-rotation mating surface 233 of the lower shell 23, and the anti-rotation mating surface 233 of the cover main body 221 mates with the anti-rotation plane 224 to prevent rotation therebetween. The anti-rotation mating surface 223 of the cover main body 221 is further provided with a fastening structure 225, the fastening structure is a fastening hook or a fastening groove, and the fastening structure 225 and the fastening mating structure 234 of the lower shell 23 are fastened to achieve pre-fixing of the two.

In one embodiment, the upper shell 22 further includes an extended cover (uncovered) that extends from the isolation protrusion 222 to protrude inward to cover the step 212.

The pole assembly 20 of the first embodiment may be preloaded into a single unit and then installed into the pole hole 11 of the cover plate 10.

Specifically, the sealing element 24 is firstly installed in the lower shell 23 from above, and the edge of the clamping ring body 241 of the sealing element 24 is limited on the inner convex ring 235; and then the pole column 21 is arranged in the lower shell 23 from the upper side, the lower surface of the fixing ring 211 of the pole column 21 is attached to the upper surface of the clamping ring body 241 of the sealing element 24, and the clamping groove 215 radially limits the limiting convex edge 242 of the sealing element 24 to the outer side so as to prevent the sealing element 24 from deforming and sliding inwards. Alternatively, the seal member 24 may be attached to the lower surface of the pole piece 21 and then fitted into the lower case 23, thereby preventing the seal member 24 from being deformed by displacement.

Finally, the upper case 22 is pressed into the lower case 23 from above, at this time, the cover body 221 covers the upper surface of the fixing ring 211, and the fastening structure 225 of the upper case 22 is pre-fastened with the fastening structure 235 of the lower case 23.

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 housing 23 to prevent the pole 21 from rotating in the lower housing 23. The anti-rotation plane 214 outside the step 212 of the pole 21 is matched with the anti-rotation matching surface 223 in the upper shell 22 to prevent rotation between the upper shell 22 and the pole 21. The rotation preventing plane 224 of the upper case 22 outside the cover body 221 is engaged with the rotation preventing engaging surface 233 of the lower case 23 to prevent rotation between the lower case 23 and the upper case 22.

The upper case 22 is made of conductive plastic material such as conductive PPS, and the lower case 23 is made of insulating plastic. The resistance value of the conductive plastic material of the upper shell 22 is between 1 ohm and 10000 ohm, and the upper shell 22 can effectively reduce the potential difference between the cover plate 10 and the pole 21 by adopting the conductive plastic material, thereby avoiding electric corrosion to the cover plate 10 and the pole so as to improve the service lives of the pole 21 and the cover plate 10. The price of the conductive plastic material is two to three times that of the insulating plastic material, the shell is divided into the upper shell 22 and the lower shell 23 in the embodiment, the upper shell 22 has a covering function volume and the material is greatly reduced, and the lower shell 23 has a containing function volume and the material is relatively larger. Compared with the traditional technical scheme that all adopt conductive plastic materials, the material cost can be greatly reduced, and compared with the traditional technical scheme that all adopt conductive plastic materials, the upper shell 22 and the lower shell 23 can save the conductive plastic materials by 60% -70%, and the market competitiveness of the product is effectively improved.

Meanwhile, compared with the conventional pole, the lower side of the pole 21 in the first embodiment does not need to protrude downwards, the thickness of the pole 21 is greatly reduced, the material cost of the pole 21 can be reduced by 55% -70%, the pole 21 is simple in structure, and can be manufactured by using a stamping process without performing a CNC processing technology with high cost, so that the manufacturing cost can be further reduced. Meanwhile, the space utilization rate is improved, and the energy density of the product in unit volume can be improved. The upper shell 22, the lower shell 23 and the sealing member 24 of the first embodiment are all formed by injection molding independently, i.e. the pole assembly 20 has no in-mold injection molding process, so as to reduce the manufacturing cost.

Most importantly, the pole assembly 20 according to the first embodiment is adopted, all the components are independent, and the pole assembly is simply assembled, so that the pole assembly can be standardized, and when different product types are developed, the pole assembly can be generalized, and the cover plate 10 of different types can be redeveloped. The whole industrial redundancy is reduced, the product development speed is improved, and the inventory cost is reduced.

Example two

With continued reference to fig. 12, the second embodiment is an alternative structure of the first embodiment, and is different from the first embodiment in that: the lower shell 23 is eliminated and instead the seal 25 integrates the functions of the original seal 24 and the lower shell 23.

Specifically, the pole 21 and the upper case 22 have unchanged structures, and the sealing member 25 includes a cover body 211 covering the lower surface of the fixing ring 211 of the pole 21, an extension cylinder 243 extending downward from the inner edge of the cover body 241, and an annular body 231 extending upward from the outer edge of the cover 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 stepped portion 212.

When assembled, the sealing member 25 is wrapped up around 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 being installed. The inner edge of the annular main body 231 may further extend toward the center of the circle to form an extending edge covering a part of the surface of the main body 221 of the upper shell 22, and when assembling, the upper shell 22 is sleeved outside the pole 21, and then the sealing member 25 is wrapped outside the pole 21 from bottom to top and wraps a part of the surface of the upper shell 22 to achieve pre-fixing.

The clamping groove 215 on the lower surface of the pole 21 and the limit convex edge 242 of the sealing member 25 covering the edge of the main body 241 can be kept, so that the sealing member 25 cannot generate a problem of collapsing and displacement in the process of pressing the sealing member 25. The upper shell 22 is made of conductive plastic material similar to that of the embodiment.

The embodiment is simpler in construction by eliminating one lower case 23 assembly compared to the first embodiment, but the lack of hard material support on the outer periphery of the pole 21 retaining ring 211 may present a risk of slight movement.

Example III

Fig. 13 to 15 are views showing the three pole assembly 20 and the battery top cover according to the embodiment of the present application, and the following describes the structure of the third embodiment of the present application in detail.

Embodiment three is an alternative to embodiment one, in which a part of the functional structure of the lower case 23 is integrated on the upper case 22, so that the upper case 22 and the lower case 23 form a single structure. This component is still referred to as the upper housing 22 in this embodiment, as it is nested over the pole 21.

Specifically, the upper case 22 of the pole assembly 20 of the present embodiment includes a cover body 221 covering the upper surface of the fixing ring 211 of the pole 21, a separation protrusion 222 extending upward from the inner edge of the cover body 221, and an annular body 231 extending downward from the outer edge of the cover body 221 and wrapping the outer surface of the fixing ring 211. The downwardly extending 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 inside the annular body 231.

In one implementation of this embodiment, the clamping groove 215 at the bottom of the pole 21 and the limiting flange 242 of the sealing member 24 may still remain to limit the position of the sealing member 24, so as to avoid the inward collapse after extrusion.

Compared with the first embodiment, the present embodiment eliminates the lower case 23 and integrates part of the functions of the lower case 23 to the upper case 22, which can make the structure simpler. In assembly, the pole 21 is pressed into the upper case 22 in an interference manner, and then the sealing member 24 is installed into the annular body 231 of the upper case 22 and is attached to the bottom surface of the fixing ring 211 of the pole 21. The disadvantage is that the use amount of the conductive plastic material is increased, and the material cost of the product is increased. Similarly, the embodiment can be popularized as an industry standard, so that the components are universal.

In this embodiment, the annular body 231, the cover body 221 and the inner wall surfaces of the isolation protrusion 222 of the upper case 22 still have anti-rotation mating surfaces 223,233 to mate with the anti-rotation plane 214 of the pole 21 to prevent rotation between the upper case 22 and the pole 21. The anti-rotation block 232 is retained outside the annular body 231 to cooperate with the anti-rotation slot 115 in the pole bore 11 to prevent rotation of the pole assembly 20 within the pole bore 11.

Example IV

Referring to fig. 16 to 18, a four-pole assembly 20 and a battery top cover according to an embodiment of the present application are shown, and the structural principle of the fourth embodiment of the present application will be described in detail.

The fourth embodiment is an improvement and optimization of the third embodiment, and the difference is that a gasket 26 is added, and a containing groove 261 is formed in a concave manner on the outer edge of the gasket 26. The annular body 231 of the upper case 22 is received at the bottom thereof in the receiving groove 261. And the downward extending length of the annular body 231 is correspondingly shortened, and the bottom edge of the fixing ring 211 of the pole 21 is pressed against the upper surface of the spacer 26.

The gasket 26 can restrict the annular body 231 of the upper case 22 from collapsing inwardly to press the seal 24 when the flange 116 of the pole hole 11 is swaged and the upper case 22 is pressed downward, preventing the seal 24 from being displaced.

Referring to fig. 10 and 11 with emphasis, the post assembly 20 described in the first to fourth embodiments is finally installed in the post hole 11 of the cover plate 10, and the sealing member 24 is clamped between the fixing ring 211 of the post 21 and the bottom wall 114 of the post hole 11. The extending tube 243 extends downward on the inner wall of the through hole 112 at the bottom wall 114, and is in contact with the annular boss 431 of the connecting hole 43 of the insulating plate body 40, and the annular boss 431 plays a certain supporting role on the sealing member 24, so as to prevent the sealing member 24 from being deformed by extrusion and extending downward. In an embodiment, the limiting boss 431 may be configured to be inclined toward the center of the circle, such that the extended cylindrical portion 243 of the sealing member 24 is located between the limiting boss 431 and the inner wall surface of the through hole 112.

Subsequently, the top of the side wall 113 of the pole hole 11 is riveted in the center direction to form a flange 116 which presses the cover body 221 of the upper case 22 downward, and the clamping body 241 of the sealing member 24 between the fixing ring 211 and the bottom wall 114 is sealed by pressing. The outer edge of the fixing ring 211 at least partially overlaps the flange 116 in the vertical projection direction. The flange 116 and the isolation protrusion 222 are flush with the surface of the step 212.

After the pole assembly 20 of the first embodiment and the second embodiment is riveted and fixed in the pole hole 11, the limiting flange 242 of the sealing member 24 is limited radially outwards by the clamping groove 215 at the bottom of the fixing ring 211, so as to avoid the sealing member 24 from collapsing towards the center of the circle.

It should be noted that the pole assembly 20 of the first to fourth embodiments can be equally applied to the cover plate 10 using the weld ring, and the pole assembly 20 can be applied thereto as in the patent application No. 202110666517.4 filed by the applicant. This greatly increases the versatility of the post assembly 20 of the present application and makes it a common standard.

The battery cover plate is used for a power battery, and the power battery further comprises a battery shell, an electric core packaged in the battery shell, a battery cover plate for sealing the electric core in the battery shell and a conductive sheet for connecting the pole column 21 and the electric core. Specifically, the conductive sheet is welded to the lower surface of the middle portion of the fixing ring 211 of the pole 21 through the connection hole 43 of the insulating plate body 40 under the battery cover.

The pole assemblies 20 in the embodiments of the present application are all cylindrical in shape, and in other embodiments, square poles are still within the scope of the present application.

Example five

With continued reference to fig. 19 to 22, a fifth embodiment mainly describes the molding process of the post hole 11 of the cover plate 10.

In this embodiment, the Y direction shown in fig. 19 is the longitudinal direction, the X direction is the transverse direction, and the Z direction is the vertical direction.

The cover plate forming method mainly comprises the following steps:

s101, providing a metal plate S, and stamping to form claw marks 111 distributed in an annular mode at a preset position of the metal plate S;

this step is an optional step and in various embodiments, the stamping of the jaws in this step may be omitted. The claw mark 111 is used in some in-mold injection molding schemes to increase the bonding force with the molded plastic.

The claw marks 111 are punched and formed on both sides of the metal plate S in the transverse direction, and correspond to the positive electrode and the negative electrode of the post hole 11. In some embodiments, such as a blade battery, it is only necessary to form one annular claw print 11 in the transverse direction of the metal sheet S.

In this step, the stamping die 91 is implemented by the stamping die 91, and the stamping die 91 includes a positioning die 911 that is cylindrically pressed against the surface of the metal sheet S, and a stamping punch 912 that is disposed in the positioning die 911 and configured to impact the metal sheet S downward from a plurality of hole structures formed in the positioning die 911 so as to form the claw mark. Specifically, a plurality of hole structures distributed in a ring shape are arranged at the periphery of the positioning die 911, and the stamping punch 912 is stamped downwards from the hole structures to form the claw marks.

S102, punching a through hole 112 in the middle of the claw mark 111 of the metal plate S;

in this step, a punching die 92 is used to punch a hole 112 in the middle of the annular claw mark 111, the hole 112 is concentric with the annular claw mark 111, and a certain distance exists between the edge of the hole 112 and the position of the claw mark 111.

The stamping die 92 includes a lower fixing sleeve 922 that is hollow and supported on the lower surface of the metal sheet S, an upper fixing sleeve 921 that corresponds to the lower fixing sleeve 922 and is hollow and held on the upper surface of the metal sheet S, and a punching punch 923 that is sleeved in the upper fixing sleeve 921. The portion of the metal plate S at the predetermined position is punched and cut downward by the punching punch 923 and the through hole 112 is formed.

S103, deburring the punched holes;

the step is mainly to remove burrs formed in the punching process of the step S102, is unnecessary, and can be canceled according to the conditions of product quality, punching process improvement and the like. The deburring die 93 is used for removing substances such as burrs, and the subsequent short circuit and the like are avoided.

S104, flanging the metal plate S at the periphery of the through hole 112 upwards to form an upwards extending side wall 113;

The flanging amount in this step is determined by the product dimension specification. The flanging operation in this step is realized by using the 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 through hole 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 protrudes into the through hole 112, and the head 945 is beneficial to protect the edge of the through hole 112. The edge of the top end of the flanging punch 942 is of an arc structure, so that the metal plate S is prevented from being damaged during upward flanging.

In the flanging operation, the head 945 of the positioning head 943 is inserted downward into the through hole 112 to protect the edge of the through hole 112, the flanging punch 942 presses the metal sheet S upward, and the flanging punch 942 is concentric with the through hole 112. A gap exists 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 which is bent upward. When the flanging punch 942 moves upward, it contacts the head 945 of the positioning head 943 and pushes the positioning head 943 upward, and then, starts to press the metal sheet S upward until the metal sheet S around the periphery of the through-hole 112 is pressed upward to form the side wall 113. At this time, the side wall 113 preferably has a certain inclination angle, and in particular, the side wall 113 is inclined at a small angle toward the center of the circle.

S105, shaping the side wall 113 at the periphery of the through hole 112;

this step mainly shapes the side wall 113 to be vertical. The operation is mainly performed by the shaping mold 95, the shaping mold 95 limits the peripheral position of the side wall 113 by 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 press the side wall 113 outwards so as to be in a numerical state of 90 degrees.

S106, shaping the side wall 113 to enable the side wall 113 to reach a preset shape;

in this step, the flatness of the top surface of the sidewall 113 is mainly shaped, and the thickness of each position is shaped. Bringing the side walls 113 to a predetermined shape configuration. Specifically, the process of this step is performed by a side-beating die 96, the side-beating die 96 includes a hollow upper die base 961, a side-beating punch 962 inserted into the upper die base 961, and a lower supporting die 963. The bottom surface middle portion of the edge beating punch 962 is formed with a punch pressing portion 964 protruding downward, and a gap for accommodating the side wall 113 is formed between the outer periphery of the punch pressing portion 964 and the inner wall surface of the upper die base 961, and the height of the gap is a predetermined height of the side wall 113.

When the edge is tapped, the edge beating punch 962 presses downwards, so that the side wall 113 generates metal flow and makes the metal flow uniform, and the heights at all positions are kept consistent.

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

in this step, a part of the inner wall thickness of the side wall 113 is pressed downward to form the horizontal bottom wall 114, and after this step, the thickness of the side wall 113 is reduced by more than half, that is, more than half of the inner wall thickness of the side wall 113 is pressed into the bottom wall 114. Meanwhile, the thickness of the bottom wall 114 is greater than that of the side wall 113.

The step adopts a material distributing die 97 for operation, wherein the material distributing die 97 comprises a hollow upper die base 971, a hollow lower die base 973 and a material distributing 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 by a certain position, and the recess is located at the outer side of the 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 material dividing.

In another embodiment, the dispensing die 97 of the present application is modified to form the perforations 112 intact while dispensing. At this time, according to the inner diameter of the through hole 112, the bottom surfaces of the lower die base 973 and the material dividing punch 972 are respectively provided with a hole and a protrusion structure which are matched with each other, so that the metal material extruded downwards is limited at the periphery of the protrusion. The protrusion is provided with a slope to be easily inserted into the hole, preferably the protrusion is provided on the bottom surface of the material dividing punch 972, the hole is provided in the lower die base 972, and the positions of the protrusion and the hole can be interchanged. At this time, the bottom wall 114 and the through hole 112 can be punched well by controlling the thickness of the material.

S108, cutting the metal sheet S into a plurality of cover plate units along the transverse direction;

the step is to cut the plurality of pole holes 11 continuously punched in the metal sheet S into a plurality of independent cover plate 10 units. In the present embodiment, each cap plate 10 unit includes two pole holes 11 distributed in the longitudinal direction. I.e. the metal sheet S is cut into a plurality of cover plate 10 units along the dashed line C shown in fig. 23.

In the fifth embodiment, the pole hole 11 of the cover plate 10 is formed by stamping, and the side wall 113 is bent by integral riveting to fix the pole assembly 20, so that the need of welding and fixing the pole assembly 20 by adopting an independent forming welding ring in the prior art is avoided, the cost is greatly reduced, the structure is simple, and the assembly is simple.

Example six

With continued reference to fig. 23 to 26, a sixth embodiment mainly describes another molding process of the post hole 11 of the cover plate 10.

The cover plate forming method of the embodiment mainly comprises the following steps:

s201, providing a metal sheet S, pressing a predetermined area of the metal sheet S to thin the area and forcing the excessive metal to flow upwards to form the side wall 113, and forming a thinned bottom wall 114;

in this step, the operation is performed by the upsetting die 81, and specifically, the upsetting die 81 includes a lower die holder 812 having a flat surface, a hollow upper die sleeve 811, and a upsetting punch 813 inserted into the upper die sleeve 811.

The lower die holder 812 is supported on the bottom surface of the metal plate S corresponding to the position, the upper die sleeve 811 is hollow and pressed on the upper surface of the metal plate S corresponding to the position, and a material dividing groove 814 is formed on the lower side of the hollow cavity of the upper die sleeve 811 in a recessed manner along the radial direction, 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 upsetting punch 813 protrudes downward, and the outer diameter of the protruding portion is not larger than the inner diameter of the through hole 112.

In this step, the wall thickness of the side wall 113 in the vertical direction is not necessarily uniform, and may be designed to be thick at the bottom and thin at the top.

In another embodiment, the material dividing groove 814 may be disposed at the lower periphery of the upsetting punch 813, and the hollow inner wall surface of the upper die seat 811 may be kept flat; or the material dividing groove 814 is formed by combining the upper die seat 811 and the upsetting punch 813 together.

In the upsetting process of this step, the middle protruding portion of the upsetting punch 813 presses the metal plate S downward at a predetermined position, so that the metal at the position flows radially outward to be thinned, and the metal at the corresponding position S is completely pressed by the lower surface of the upsetting punch 813, and at this time, the metal at the position flows radially outward and finally grows along the distribution groove 814 to form the side wall 113, and simultaneously the bottom wall 114 is formed, and the middle protruding portion of the bottom wall 114 corresponding to the upsetting punch 813 forms a bottom wall intermediate 114' thinner than the bottom wall 114.

S202, shaping the bottom wall 114 and the side wall 113;

in this step, the irregular positions of the bottom wall 114 and the side wall 113 are shaped to have a predetermined thickness and shape.

This step is operated by a sizing die 82, which sizing die 82 comprises a lower die holder 822, an upper die sleeve 822 and a sizing punch 823 inserted into the upper die sleeve 823. Similar to the pier extruding die 81, the upper die sleeve 822 and the shaping punch 823 are formed with shaping grooves 824 at positions corresponding to the side walls 113, the shaping grooves 824 are formed by combining outward concave inner wall surfaces of the hollow cavity of the upper die sleeve 821 with inward concave outer surfaces of the shaping punch 823, so that the shaping punch 823 can be prevented from separating the side walls 113 again when stamping and shaping the side walls 113 downwards, and the lower thickness of the side walls 113 is also reduced in the step S201. The middle portion of the bottom surface of the shaping punch 823 is also formed with a protruding portion protruding downward to further bring the thickness of the bottom wall 114 to a predetermined thickness and secure the flatness of the bottom wall 114. The height of the shaping groove 824 corresponds to the predetermined height of the sidewall 113, and after this step, the surface of the sidewall 113 is shaped to be flat and the thickness of the sidewall 113 is maintained to be uniform.

A concave space is formed in the middle of the lower die holder 822 corresponding to the side wall 113, so that the bottom wall 114 is slightly convex downwards and forms a convex surface T.

S203, cutting off the middle part of the bottom wall 114 to form a perforation 112;

in this step, the stamping is performed by a simple stamping die, and the corresponding die structure is not shown in the drawing. Specifically, the bottom wall intermediate 114' is cut away to form the perforations 112.

S204, cutting the metal sheet S into a plurality of cover plate units along the transverse direction;

the step is to cut the plurality of pole holes 11 continuously punched in the metal sheet S into a plurality of independent cover plate 10 units. In the present embodiment, each cap plate 10 unit includes two pole holes 11 distributed in the longitudinal direction. I.e. the metal sheet S is cut into a plurality of cover plate 10 units along the dashed line C shown in fig. 26. The cutting device is relatively simple and is not shown in the figures. The cutting step and the operation flow can be arranged in a continuous stamping device, and each stamping procedure can be completed once by continuous operation and one stamping action, so that the stamping efficiency can be effectively improved.

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 integral riveting to fix the pole assembly 20, so that the need of welding and fixing the pole assembly 20 by adopting an independent forming welding ring in the prior art is avoided, the cost is greatly reduced, the structure is simple, and the assembly is simple. Compared with the molding method of the fifth embodiment, the method of the fifth embodiment has simpler steps, simpler stamping equipment, effectively improved efficiency and reduced cost.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The cover plate forming method is characterized by comprising the following steps of:

s202, shaping the bottom wall and the side wall;

2. The method of claim 1, wherein in step S201, the selected area of the metal plate is the area where the post hole is located, and the thinned metal on the upper layer of the metal plate flows to form the sidewall.

3. The method for forming a cover plate according to claim 2, wherein the operation is performed in step S201 by a upsetting die, the upsetting die comprises a lower die holder with a flat surface, a hollow upper die sleeve and a upsetting punch inserted into the upper die sleeve, the lower die holder is supported on the bottom surface of the metal plate at the corresponding position, the upper die sleeve is hollow and is pressed on the upper surface of the metal plate at the corresponding position, a material dividing groove is formed by recessing the lower side of the hollow cavity of the upper die sleeve radially outwards, the height of the material dividing groove is larger than the required height of the side wall, the middle position of the upsetting punch protrudes downwards, and the outer diameter of the protruding part is not larger than the inner diameter of the through hole.

4. The method of forming a cover plate according to claim 3, wherein the sidewall obtained in step S201 has a wall thickness of a lower thickness and an upper thickness, and the middle protruding portion of the upsetting punch presses the metal plate downward at a predetermined position, so that the metal at the position flows radially outward to be thinned, and continues to press downward, and the lower surface of the upsetting punch presses the metal plate at the corresponding position completely, and at this time, the metal at the position flows radially outward and grows along the distribution groove finally to form the sidewall, and the bottom wall is formed, and the middle of the bottom wall corresponds to the protruding portion of the upsetting punch to form a bottom wall intermediate thinner than the bottom wall.

5. The method of forming a cover plate according to claim 4, wherein step S202 is performed by a forming die including a lower die holder, an upper die sleeve, and a forming punch inserted into the upper die sleeve, the upper die sleeve and the forming punch being formed with a forming groove at a position corresponding to the sidewall, the forming groove being formed by combining an outward recess of an inner wall surface of a hollow cavity of the upper die sleeve with an inward recess of an outer surface of the forming punch, a height of the forming groove being identical to a predetermined height of the sidewall, and after the step, the sidewall surface being formed to be flat and a thickness of the sidewall being identical.

6. The method of forming a cover plate according to claim 5, wherein in step S202, a concave space is formed in the middle of the lower die holder corresponding to the side wall, so that the bottom wall protrudes downward and forms a protruding surface.

7. The cover plate molding method according to claim 5, wherein in step S203, the cut-away portion is the thinner bottom wall intermediate.

8. The cover plate molding method as claimed in claim 1, further comprising a step of cutting the metal plate material into cover plate units after the step S203, each cover plate unit including at least one of the pole holes.

9. The battery top cover is characterized by comprising the cover plate formed by the method of claim 1 and a pole assembly fixed in the cover plate, wherein the pole assembly comprises a pole, an upper shell covered on the upper surface of the pole part and a sealing element attached to the lower surface of the pole, the sealing element is clamped between the bottom wall and the lower surface of the pole, and the side wall is bent inwards to be pressed on the upper shell and applies downward pressure to deform the sealing element to realize sealing.

10. The battery top cover of claim 9, wherein the upper case is made of a conductive plastic material, and the resistance of the conductive plastic is between 1 ohm and 10000 ohm.

11. The battery top cover according to claim 10, wherein the post comprises a fixing ring, a connecting portion formed by protruding upwards from the middle of the fixing ring, and a step portion formed 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 post assembly further comprises a lower shell wrapping the outer side surface of the fixing ring, the lower shell is made of insulating plastic, the lower shell comprises an annular main body, a limit step formed by protruding inwards in the radial direction from the inner wall surface of the annular main body, the upper shell comprises a cover main body covered on the upper surface of the fixing ring and a separation protrusion formed by extending upwards from the inner edge of the cover main body, the separation protrusion covers the outer side surface of the step portion, the fixing ring is pressed into the lower shell, the outer edge of the lower surface of the fixing ring is limited on the limit step, the upper shell is buckled into the lower shell and the post is fixed in the lower shell, and the upper shell exceeds the upper surface of the upper main body.