CN220753588U - Battery top cover - Google Patents

Abstract

The utility model discloses a battery top cover, which comprises a cover plate, wherein a pole mounting hole group is formed in the cover plate; the pole group is arranged in the pole mounting hole group in a penetrating manner, and the top of the pole group is provided with a pressing part group; the upper plastic part group is supported on the cover plate, and the pressing part group is riveted and pressed on the upper plastic part group; and the lower plastic part is connected to the bottom of the cover plate, and a limiting groove group matched with the pole group for limiting is arranged at the bottom of the lower plastic part. Compared with the prior art, the pole top is provided with the pressing part, the pressing part is formed by riveting and folding the annular body at the top of the pole after the pole is assembled in place so as to be pressed on the upper plastic part, a pole ring does not need to be formed, the pole is not required to be welded, the assembly process is less, and the assembly efficiency can be effectively improved.

Description

Battery top cover

Technical Field

The utility model relates to the technical field of power batteries, in particular to a battery top cover.

Background

The basic structure of the power battery mostly comprises a hollow shell, an electric core arranged in the shell, a positive top cover respectively covered on the shell and connected with the shell through a positive plate, and a negative top cover connected with the shell through a negative plate. The positive pole top cap and the negative pole top cap all include apron, utmost point post, sealing washer, go up plastic part and lower plastic part, and current utmost point post is when the installation, adopts punching press or tensile after forming the utmost point post ring on the apron to weld the utmost point post and fix on the post ring, goes up the injection moulding parcel utmost point post of plastic part and realizes the isolation of utmost point post and apron again, and the technology is complicated and need adopt independent injection molding equipment and mould to realize, and packaging efficiency is low. Meanwhile, high temperature is introduced in both the welding process and the injection molding process, so that the sealing ring is deformed by heating to influence the sealing performance.

Disclosure of Invention

Therefore, the present utility model is directed to a battery top cover, which solves the problem of complex assembly and molding process of the pole and the upper plastic member in the prior art.

In order to achieve the above object, the present utility model provides a battery top cover, comprising:

the cover plate is provided with a pole mounting hole group;

the pole group is arranged in the pole mounting hole group in a penetrating manner, and the top of the pole group is provided with a pressing part group;

the upper plastic part group is supported on the cover plate, and the pressing part group is riveted and pressed on the upper plastic part group; and

the lower plastic part is connected to the bottom of the cover plate, and a limit groove group matched with the pole group for limiting is arranged at the bottom of the lower plastic part.

Further, the post group includes first post and second post, the spacing groove group of plastic part down is including corresponding to respectively first spacing groove and the second spacing groove that first post and second post set up, the shape of the base of first post and second post with the shape adaptation in first spacing groove and second spacing groove makes first post limit is located in the first spacing groove, the second post limit is located in the second spacing groove.

Further, the pole group comprises a base, a column body arranged on the base and an annular body arranged at the outer edge of the top of the column body, the annular body is outwards riveted to form the pressing part group after the pole group is assembled in place, and the column body sequentially penetrates through the lower plastic part and the cover plate from bottom to top.

Further, the bottom of apron is formed with and encircles the pressure equipment groove group of the edge of utmost point post mounting hole group, the top of lower plastic part be provided with the cooperation of pressure equipment groove group realizes the pressure equipment of apron and lower plastic part location and closes the ring group.

Further, the shape of the base is limited to a shape formed by circular arcs and/or three or more sides.

Further, the upper plastic part group comprises a main body ring part supported on the cover plate and an isolation ring part integrally extending downwards from the inner peripheral surface of the main body ring part, the pressing part is pressed on the main body ring part, and the isolation ring part is sleeved in the pole mounting hole group.

Further, the lower surface of main part ring portion is formed with the anti-rotation portion along circumference, correspond on the apron anti-rotation portion the position department be provided with the anti-rotation portion cooperation realizes go up the plastic part group circumference prevents changeing the anti-rotation cooperation portion.

Further, the anti-rotation part comprises a plurality of anti-rotation protruding points and/or a plurality of anti-rotation grooves which are circumferentially distributed, the anti-rotation matching part comprises a plurality of anti-rotation matching grooves and/or anti-rotation matching protruding points which are circumferentially distributed, and the anti-rotation protruding points are matched with the anti-rotation matching grooves and/or the anti-rotation grooves are matched with the anti-rotation matching protruding points to realize circumferential anti-rotation of the upper plastic part.

Further, the upper plastic part group comprises a first upper plastic part and a second upper plastic part, the pressing part group comprises a first pressing part formed on the first pole and a second pressing part formed on the second pole, the first upper plastic part is sleeved outside the first pole, the first pressing part is pressed on the first upper plastic part, the second upper plastic part is sleeved outside the second pole, and the second pressing part is pressed on the second upper plastic part.

Further, the arrangement mode of the corresponding anti-rotation protruding points and/or anti-rotation grooves on the first upper plastic part is different from the arrangement mode of the anti-rotation matching protruding points and/or anti-rotation matching grooves on the second upper plastic part.

According to the utility model, the pressing part is arranged at the top of the pole, and is formed by riveting and folding after the annular body at the top of the pole is assembled in place so as to be pressed on the upper plastic part, and meanwhile, the first limit groove and the second limit groove are arranged at the bottom of the lower plastic part, so that the base of the pole can be limited in the first limit groove and the second limit groove to limit the axial displacement of the pole, the fixing of the pole is realized, the pole ring is not required to be formed, the pole is not required to be welded, the assembling procedure is less, and the assembling efficiency can be effectively improved. Meanwhile, the upper plastic part is prefabricated and formed, in-mold injection is not needed, injection molding equipment and a mold can be saved, high-temperature introduction is avoided, and therefore the sealing ring is prevented from being deformed by heat, and the sealing effect is good.

Drawings

Fig. 1 is a schematic view showing the structure of a battery top cover according to an embodiment of the present utility model.

Fig. 2 is an exploded view of the present utility model.

Fig. 3 is a view from A-A of fig. 1.

Fig. 4 is an enlarged view at B in fig. 3.

Fig. 5 is a schematic structural view of the cover plate.

Fig. 6 is an enlarged view at C in fig. 5.

Fig. 7 is a schematic structural view of a pole.

Fig. 8 is a schematic structural view of the post prior to crimping.

Fig. 9 is a schematic structural view of the upper plastic part.

Fig. 10 is another schematic structural view of the upper plastic part.

Fig. 11 is a schematic structural view of the bottom of the lower plastic part.

Fig. 12 is a schematic structural view of the seal ring.

Fig. 13 is a schematic view of the post of fig. 3 prior to crimping.

The specification reference numerals are as follows:

cover plate 100, post mounting hole 110, liquid injection hole 120, explosion-proof mounting hole 130, rotation preventing portion 140, rotation preventing groove 141, positioning portion 150, positioning collar 151, first supporting surface 152, press-fit groove 160, post 200, base 210, column 220, holding portion 230, annular body 240, first foolproof portion 250, second foolproof portion 260, upper plastic part 300, perforation 310, main body ring portion 320, spacer ring portion 330, rotation preventing mating portion 340, rotation preventing mating bump 341, positioning mating portion 350, positioning mating ring groove 351, second supporting surface 352, accommodation groove 360, lower plastic part 400, through hole 410, press-fit mating ring 420, first limiting groove 430, first foolproof mating portion 431, second limiting groove 440, second foolproof mating portion 441, sealing ring 500, assembly groove 510, spacing ring groove 600, explosion-proof assembly 700, explosion-proof piece 710, and protective film 720.

Detailed Description

The following is a further detailed description of the embodiments:

examples

Referring to fig. 1, 2, 3 and 4, the battery top cover of the present utility model includes a cover plate 100, a post 200 penetrating through the cover plate 100, an upper plastic part 300 and a lower plastic part 400 pressed between the cover plate 100 and the post 200, and a sealing ring 500 surrounding the post 200, wherein the post 200 penetrates into the cover plate 100 from bottom to top, and is sealed with the cover plate 100 in an insulating manner by the upper plastic part 300, the lower plastic part 400 and the sealing ring 500. In a common example, the battery top cover is generally configured to include a pole group, two poles 200 in the pole group, a first pole and a second pole, respectively, where the first pole may be defined as a positive pole and the second pole may be defined as a negative pole, or the first pole may be defined as a negative pole and the second pole may be defined as a positive pole. The cover plate 100 is provided with a pole mounting hole group corresponding to the first pole and the second pole, the pole mounting hole group comprises a first pole mounting hole corresponding to the first pole and a second pole mounting hole corresponding to the second pole, and the first pole and the second pole correspondingly penetrate through the first pole mounting hole and the second pole mounting hole; meanwhile, an upper plastic part group, a lower plastic part group and a sealing ring group are correspondingly arranged between the pole group and the cover plate 100, the upper plastic part group comprises a first upper plastic part, a second lower plastic part and a lower plastic part, the lower plastic part group comprises a first lower plastic part, a second lower plastic part and a sealing ring group which comprises a first sealing ring and a second sealing ring, the first upper plastic part, the first lower plastic part and the first sealing ring are correspondingly arranged with the first pole, and the second upper plastic part, the second lower plastic part and the second sealing ring are correspondingly arranged with the second pole. The first lower plastic part and the second lower plastic part can be of an integral structure, namely, the first pole and the second pole are positioned and insulated from the cover plate 100 at the same time by arranging the integral lower plastic part 400 under the cover plate 100, and the first lower plastic part and the second lower plastic part can also be of a split structure, namely, the first lower plastic part and the second lower plastic part are respectively arranged, so that the positioning of the first pole and the insulation of the cover plate 100 are realized through the first lower plastic part, and the positioning of the second pole and the insulation of the cover plate 100 are realized through the second lower plastic part.

In this embodiment, since the first and second poles are identical or similar in structure, and since the battery top cover may have only one pole 200 in some embodiments, the present embodiment will be described below with the pole 200 replacing the first and second poles or pole groups, the pole mounting holes 110 replacing the first and second pole mounting holes or pole mounting hole groups, the upper insulator replacing the first and second upper insulators or upper insulator groups, the lower insulator replacing the first and second lower insulators, and the seal ring 500 replacing the first and second seal rings or seal ring groups for clarity of description.

Referring to fig. 5 and 6, the cover plate 100 is provided with a pole mounting hole 110, the pole 200 penetrates into the pole mounting hole 110 from bottom to top, and when the pole 200 is assembled in place, the bottom of the pole 200 abuts against and is limited on the lower surface of the lower plastic member 400, and the top of the pole 200 penetrates out of the upper surface of the cover plate 100 upwards and is crimped on the upper plastic member 300, so that axial limitation of the pole 200 after the assembly is completed can be realized by matching the pole 200 with the upper plastic member 300 and the lower plastic member 400, and further quick fixing of the pole 200 is realized without welding. The cover plate 100 is further formed with a liquid injection hole 120 and an explosion-proof mounting hole 130 in a penetrating manner, wherein the liquid injection hole 120 is a stepped hole with a large upper part and a small lower part and is used for injecting electrolyte into the power battery; the hole diameter of the end of the liquid injection hole 120 close to the upper surface of the cover plate 100 is larger, the hole diameter of the end close to the lower surface of the cover plate 100 is smaller, and the hole wall of the end with larger hole diameter is in a conical surface structure, and the hole diameter of the hole wall is gradually reduced from outside to inside so as to collect liquid in the liquid injection process.

The cover plate 100 is provided with an anti-rotation part 140 corresponding to the upper plastic part 300, and the anti-rotation part 140 is circumferentially distributed on the upper surface of the cover plate 100 around the periphery of the pole mounting hole 110. The anti-rotation portion 140 includes a plurality of anti-rotation grooves 141 uniformly distributed on the cover plate 100, and the plurality of anti-rotation grooves 141 are circumferentially distributed on the periphery of the pole mounting hole 110 to cooperate with corresponding positions of the bottom of the upper plastic 300 to limit circumferential rotation of the upper plastic 300. Specifically, the anti-rotation groove 141 is integrally formed in a recessed manner from the upper surface of the cover plate 100 in a direction away from the upper plastic part 300, so that after the upper plastic part 300 is assembled in place, the anti-rotation groove 141 can accommodate a protruding structure at the bottom of the upper plastic part 300 to realize circumferential anti-rotation of the upper plastic part 300.

It will be appreciated that in other embodiments, the anti-rotation portion 140 may also be a plurality of anti-rotation bumps (not shown) formed on the cover plate 100, and the plurality of anti-rotation bumps are circumferentially distributed on the periphery of the pole mounting hole 110 to cooperate with the bottom of the upper plastic 300 to realize circumferential anti-rotation of the upper plastic 300. Specifically, the anti-rotation protruding point is integrally protruded from the upper surface of the cover plate 100 toward the direction approaching to the upper plastic part 300, so that after the upper plastic part 300 is assembled in place, the anti-rotation protruding point can extend into the bottom of the upper plastic part 300 to limit the circumferential rotation of the upper plastic part 300. In other still other embodiments, the anti-rotation portion 140 may also include anti-rotation grooves 141 and anti-rotation protrusions, where when the anti-rotation grooves 141 and the anti-rotation protrusions are formed on the cover plate 100 at the same time, the anti-rotation grooves 141 and the anti-rotation protrusions may be distributed at intervals along the circumferential direction or in any arrangement order, so as to cooperate with the upper plastic part 300 to achieve circumferential anti-rotation of the upper plastic part 300.

In this embodiment, the anti-rotation grooves 141 and the anti-rotation protruding points may be formed by integrally stamping or stretching the cover plate 100 during the forming process of the cover plate 100, so that an anti-rotation structure is not required to be additionally arranged, which is beneficial to the rapid assembly of the battery top cover, and meanwhile, the omission of the anti-rotation structure can reduce the assembly gap between each component, thereby being beneficial to improving the sealing performance of the interior of the power battery.

In particular, when the pole 200 is defined as a first pole and/or a second pole, the rotation preventing part 140 is defined as a first rotation preventing part 140 formed on the first pole side and/or a second rotation preventing part 140 formed on the second pole side, the number and/or arrangement of rotation preventing grooves 141 and/or rotation preventing protrusions corresponding to the first rotation preventing part 140 are different from the number and/or arrangement of rotation preventing grooves 141 and/or rotation preventing protrusions corresponding to the second rotation preventing part 140, and preferably the first rotation preventing part 140 is defined to include four rotation preventing grooves 141 and/or rotation preventing protrusions to indicate that the first pole on the side is the positive electrode of the battery cover 100, and the second rotation preventing part 140 is defined to include six rotation preventing grooves 141 and/or rotation preventing protrusions to indicate that the second pole on the side is the negative electrode of the battery cover 100, and vice versa; so, during the assembly, only the upper plastic part 300 that matches can accurately assemble to the anti-rotation part 140 on the corresponding side, can realize the foolproof of the first upper plastic part and the second upper plastic part in the assembly process, thereby reducing the reworked products after the assembly, and improving the yield and the production efficiency of the products. It should be understood that the number of four, six, etc. shown in the present embodiment is only an example for facilitating understanding of the present disclosure, and the present disclosure is not limited to the present disclosure, that is, in other embodiments, the first anti-rotation portion 140 may be limited to include an odd number of anti-rotation grooves 141 and/or anti-rotation protrusions, and the second anti-rotation portion 140 may be limited to include an even number of anti-rotation grooves 141 and/or anti-rotation protrusions to implement assembly fool-proofing of the first upper plastic part and the second upper plastic part, so long as the number of the two parts is different.

The cover plate 100 is further provided with a positioning portion 150, and the positioning portion 150 is correspondingly formed at the side of the anti-rotation portion 140 and is disposed around the edge of the pole mounting hole 110, so as to cooperate with the upper plastic member 300 to rapidly position the cover plate 100 during assembly, thereby improving the assembly efficiency of the battery top cover. The positioning portion 150 is defined as a positioning convex ring 151 disposed around the edge of the pole mounting hole 110, the positioning convex ring 151 integrally protrudes from the upper surface of the cover plate 100 toward a direction close to the upper plastic part 300, when the upper plastic part 300 is assembled, the upper plastic part 300 is circumferentially and axially positioned by matching the positioning convex ring 151 with the bottom of the upper plastic part 300, and after the upper plastic part 300 is assembled in place, the positioning convex ring 151 can protrude and be positioned at the bottom of the upper plastic part 300, so that not only the upper plastic part 300 can be quickly positioned, but also after the upper plastic part 300 is positioned, the anti-rotation groove 141 and/or the anti-rotation convex point can be quickly aligned with the corresponding structure of the bottom of the upper plastic part 300 only after the upper plastic part 300 is circumferentially rotated by a certain angle, thereby further improving the assembly efficiency.

In this embodiment, the positioning convex ring 151 is integrally formed on the cover plate 100 by riveting, stamping or stretching, and the outer convex surface of the positioning convex ring 151 (i.e. the surface of the positioning convex ring 151 protruding toward the upper plastic part 300) is defined as the first supporting surface 152 directly contacting the bottom of the upper plastic part 300, so as to stably support the upper plastic part 300. In particular, when the first supporting surface 152 may be further used as a forming plane of the anti-rotation groove 141 and/or the anti-rotation protrusion, so that the anti-rotation groove 141 and/or the anti-rotation protrusion is formed on the first supporting surface 152, and the anti-rotation portion 140 and the positioning portion 150 are integrated in the same structure to form simultaneously, so that the process steps are reduced, and the thickness of the positioning convex ring 151 is thicker than that of the whole cover plate 100, so that the positioning convex ring 151 can bear larger acting force, and the anti-rotation groove 141 and/or the anti-rotation protrusion are formed on the positioning convex ring 151, so that the cover plate 100 can be prevented from being broken due to stress.

It should be appreciated that, in other embodiments, the positioning portion 150 may also be a positioning ring groove (not shown) disposed around an edge of the pole mounting hole 110, and the positioning ring groove is formed by integrally recessing from the upper surface of the cover plate 100, so that the quick positioning of the upper plastic part 300 can be achieved by providing a structure capable of extending into the positioning ring groove at the bottom of the upper plastic part 300 and matching with the positioning ring groove, and at this time, the first supporting surface 152 is an inner concave surface of the positioning ring groove to support the upper plastic part 300.

The lower surface of the cover plate 100 is formed with a press-fit groove 160 encircling the edge of the pole mounting hole 110, and the press-fit groove 160 is formed by integrally and upwardly recessing the lower surface of the cover plate 100 around the pole mounting hole 110 so as to cooperate with the lower plastic part 400 to realize the positioning and press-fitting of the lower plastic part 400, thereby facilitating the accurate press-fitting of the lower plastic part 400 at the bottom of the cover plate 100. It will be appreciated that in other embodiments, the press-fit groove 160 may be configured as a press-fit ring integrally protruding downward from the lower surface of the cover plate 100, so as to cooperate with the upper surface of the lower plastic part 400 to achieve quick positioning and press-fitting of the lower plastic part 400.

A space ring groove 600 for accommodating the bottom of the upper plastic member 300 is formed between the pole 200 and the pole mounting hole 110, and the outer diameter of the corresponding position of the pole 200 is smaller than the inner diameter of the pole mounting hole 110, so that the outer circumferential surface of the pole 200 is spaced from the inner circumferential surface of the pole mounting hole 110, and the space ring groove 600 is formed therebetween, and the space ring groove 600 can prevent the outer circumferential surface of the pole 200 from contacting the inner circumferential surface of the pole mounting hole 110, and isolate the pole 200 from the pole mounting hole 110 by accommodating the upper plastic member 300 therein. In other embodiments, the annular groove 600 may also correspond to a corresponding position of the seal ring 500 and/or the lower plastic member 400, so as to ensure that the outer peripheral surface of the pole 200 is completely isolated from the inner peripheral surface of the pole mounting hole 110.

Referring to fig. 7, the pole 200 includes a base 210 positioned at the bottom of the lower plastic 400, a column 220 disposed on the base 210, and a pressing portion 230 disposed at the top of the column 220, wherein the column 220 penetrates into the pole mounting hole 110 from the lower side of the cover plate 100 and upwards penetrates out of the upper surface of the cover plate 100, so that the base 210 abuts against and is positioned at the bottom of the lower plastic 400, and the pressing portion 230 can be riveted onto the upper plastic 300 after penetrating out, so that the axial limitation and fixation of the pole 200 are realized by the cooperation of the upper and lower ends of the pole 200 with the upper plastic 300 and the lower plastic 400, respectively. When two poles 200 (i.e., pole groups) are provided, the pressing portion 230 corresponds to a pressing portion group provided on the pole group. In this embodiment, the base 210, the column 220 and the pressing portion 230 are integrally formed, and the pressing portion 230 is integrally formed on the outer edge of the column 220 by a riveting process, and the pressing portion 230 is defined as an outward flange integrally extending radially outward from the top edge of the column 220 and formed by the outer peripheral surface of the column 220, and the bottom surface of the outward flange is pressed against the upper plastic member 300. The upper surface of the outward flange formed by the outward turning 90 ° of the holding portion 230 and the upper surface of the column 220 are located at the same level to form a flat plane at the top of the pole 200, so that a groove or a convex edge can be prevented from being formed on the upper surface of the pole 200, so as to increase the contact area between the pole 200 and an external device, and further improve the contact stability between the pole 200 and the external device. It should be appreciated that in other embodiments, the base 210, the post 220 and the pressing portion 230 may be formed separately and then welded to form the pole 200, so as to reduce the difficulty of die sinking of the formed pole 200.

The pressing part 230 is integrally formed on the column 220 and corresponds to an outer edge of one end far away from the base 210, so that the pole 200 is in an i shape as a whole, the bottom of the pole 200 is positioned by abutting against the lower plastic part 400 through the upper surface of the base 210, and the top of the pole 200 is positioned by pressing the pressing part 230 and the upper plastic part 300, so as to limit the axial displacement of the pole 200. The annular groove 600 is formed between the outer circumferential surface of the cylinder 220 and the inner circumferential surface of the pole mounting hole 110, and when the pole 200 and the upper plastic member 300 are assembled in place, the bottom corresponding position of the upper plastic member 300 can extend into the annular groove 600 and be tightly pressed by the outer circumferential surface of the cylinder 220 and the inner circumferential surface of the pole mounting hole 110, so as to limit the radial displacement of the pole 200.

Referring to fig. 8, a schematic structural diagram of the post 200 before riveting is shown in the present embodiment, before the post 200 is riveted, an annular body 240 is integrally formed at the top of the post 220, the annular body 240 is disposed around the top outer edge of the post 220 and extends upward integrally from the upper surface of the post 220 on the top outer edge of the post 220, and after the post 200 is assembled with the cover plate 100, the upper plastic member 300, the sealing ring 500 and the lower plastic member 400, the post 200 may be placed in a riveting device to rivet the annular body 240, so that the annular body 240 is bent outwards by 90 ° to form a pressing portion 230 and is pressed against the upper plastic member 300, thereby realizing axial positioning and fixing of the post 200.

Referring back to fig. 2 and 7, the shape of the base 210 is similar to that of the column 220, and the area of the base 210 on the horizontal projection plane is larger than that of the pole mounting hole 110, so that after the pole 200 is mounted in place, the base 210 can completely cover the pole mounting hole 110, and the upper surface of the base 210 corresponding to the outside of the column 220 is at least partially overlapped with the cover plate 100 and abuts against the lower plastic member 400, so as to realize positioning of the bottom of the pole 200.

In this embodiment, when the pole 200 is defined as a first pole and a second pole, that is, when two poles 200 are provided on the battery top cover, the base 210 and the lower plastic member 400 cooperate to realize foolproof of the first pole and the second pole during assembly. Specifically, the base 210 is defined as a first base of the first pole and/or a second base of the second pole, corresponding to the first pole and/or the second pole, and the shapes of the first base and the second base are defined as shapes formed by circular arcs and/or three or more sides, such as circles, ovals, triangles, quadrilaterals (squares), and the like. When the first base and the second base are defined as square bases, at least three sides of the first base and the second base are adapted to the corresponding positions of the bottom of the lower plastic part 400, so as to cooperate with the lower plastic part 400 to realize the anti-rotation of the first pole and the second pole.

In particular, the first base and/or the second base have a first side portion and a second side portion that are disposed opposite to each other along a length direction or a width direction of the cover plate 100, a first foolproof portion 250 is formed at the first side portion of the first base, a second foolproof portion 260 is formed at the second side portion of the second base, and the first foolproof portion 250 and the second foolproof portion 260 are matched with the bottom of the lower plastic part 400 to realize foolproof of the first pole and the second pole. The first fool-proof portion 250 is a first notch formed on a first side of the first base, the second fool-proof portion 260 is a second notch formed on a second side of the second base, the first notch and the second notch are triangular notches formed on corresponding sides of the square base, and the first side of the first base and the second side of the second base are different sides of the pole 200, so that the first pole and the second pole can be integrally regarded as axisymmetric structures.

It is understood that in other embodiments, the first base and the second base may be defined as circular bases, and the first notch and the second notch are semi-circles or arc-shaped notches formed on the circular bases, so as to realize foolproof of the first pole and the second pole.

Referring to fig. 9 and 10, the upper plastic member 300 is supported on the cover plate 100 and is press-fitted between the cover plate 100 and the pole 200 to isolate the cover plate 100 and the pole 200, a through hole 310 is formed in the upper plastic member 300 along the axial direction, the pole 200 penetrates into the upper plastic member 300 through the through hole 310, and the outer peripheral surface of the pole 200 is tightly attached to the inner peripheral surface of the through hole 310, so as to press the upper plastic member 300 in the spacing ring groove 600, thereby increasing the tightness of the whole top cover. A pressing plane for pressing the pressing part 230 is formed at the top of the upper plastic part 300,

in this embodiment, the upper plastic part 300 and the cover plate 100 may form an anti-rotation structure to limit the circumferential rotation of the upper plastic part 300 when the upper plastic part 300 is installed in place, so as to prevent rotation of the upper plastic part 300. The upper plastic member 300 includes a main body ring portion 320 supported on the cover plate 100, a spacer ring portion 330 integrally extending downward from an inner circumferential surface of the main body ring portion 320 to form a spacer ring portion 330, and an anti-rotation fitting portion 340 and a positioning fitting portion 350 formed on a lower surface of the main body ring portion 320, the pressing portion 230 is pressed against an upper surface of the main body ring portion 320 after being riveted, the spacer ring portion 330 extends downward into the spacer ring groove 600 and is pressed between an outer circumferential surface of the column 220 and an inner circumferential surface of the pole mounting hole 110 to separate the cover plate 100 and the pole 200, and the through hole 310 is formed in a space formed around the inner circumferential surface of the spacer ring portion 330. In this embodiment, the isolating ring 330 integrally penetrates the pole mounting hole 110, and the outer peripheral surface thereof at least completely covers the inner peripheral surface of the pole mounting hole 110, so as to ensure complete isolation between the outer peripheral surface of the post 220 and the inner peripheral surface of the pole mounting hole 110, and at the same time, the end of the isolating ring 330 has a portion extending downward beyond the pole mounting hole 110, and the portion of the isolating ring 330 beyond the pole mounting hole 110 abuts against the seal ring 500, so as to further increase the tightness of the interior of the power battery.

Preferably, a receiving groove 360 into which the pressing part 230 is pressed is formed at the top of the upper plastic part 300, the shape of the receiving groove 360 is adapted to the shape of the pressing part 230, and the size of the receiving groove 360 is slightly larger than the size of the pressing part 230, so as to adapt to the micro deformation of the pressing part 230 caused by stretching and stamping in the riveting process. It should be understood that in other embodiments, the top of the upper plastic 300 may not be provided with the receiving groove 360, and the holding portion 230 of the pole 200 may be directly pressed against the upper surface of the upper plastic 300 during riveting.

The anti-rotation matching portion 340 is disposed corresponding to the anti-rotation portion 140, so as to match with the anti-rotation portion 140 to realize circumferential anti-rotation of the upper plastic part 300, and the anti-rotation matching portion 340 is distributed around the periphery of the through hole 310 on the lower surface of the upper plastic part 300. The anti-rotation matching portion 340 includes a plurality of anti-rotation matching protruding points 341 uniformly distributed at the bottom of the upper plastic part 300, and the plurality of anti-rotation matching protruding points 341 are circumferentially distributed on the lower surface of the upper plastic part 300 and correspond to the periphery of the through hole 310, so as to cooperate with the anti-rotation groove 141 on the cover plate 100 to limit the circumferential rotation of the upper plastic part 300 when the upper plastic part 300 is press-mounted on the cover plate 100. More specifically, the anti-rotation matching protruding points 341 are integrally formed by protruding from the lower surface of the upper plastic part 300 towards the direction close to the cover plate 100, and the shape and the size of the anti-rotation matching protruding points 341 are matched with those of the anti-rotation grooves 141, so that after the upper plastic part 300 is assembled in place, the anti-rotation matching protruding points 341 can extend into and are limited in the corresponding anti-rotation grooves 141, further, the anti-rotation of the upper plastic part 300 is realized, and the assembly stability of the top cover of the battery is increased.

In the embodiment, when the anti-rotation grooves 141 are formed in the cover plate 100 and the anti-rotation matching protruding points 341 are formed in the upper plastic member 300, the number of the anti-rotation grooves 141 can be greater than that of the anti-rotation matching protruding points 341, and preferably the number of the anti-rotation grooves 141 is a multiple of the anti-rotation matching protruding points 341, for example, four anti-rotation matching protruding points 341 are formed, eight anti-rotation grooves 141 are formed at the same time, namely, one group of anti-rotation protruding points 341 corresponds to two groups of anti-rotation grooves 141, each group of anti-rotation grooves 141 can be obtained by rotating any other group of anti-rotation grooves 141 around the circumferential direction by any angle, so that at least one corresponding matched anti-rotation groove 141 is formed in each anti-rotation matching protruding point 341, and when the upper plastic member 300 is assembled, the anti-rotation matching protruding points 341 can be aligned with the anti-rotation grooves 141 rapidly and limited in the anti-rotation grooves 141 after rotating the upper plastic member 300 by a certain angle. It can be appreciated that in other embodiments, the number of the anti-rotation grooves 141 may be set corresponding to the number of the anti-rotation matching protruding points 341, that is, the anti-rotation grooves 141 and the anti-rotation matching protruding points 341 are set in a one-to-one correspondence to realize the anti-rotation matching between the upper plastic part 300 and the cover plate 100.

Correspondingly, in some other embodiments, if the rotation preventing portion 140 is provided as a plurality of rotation preventing protrusions, the rotation preventing engaging portion 340 may also be a plurality of rotation preventing engaging grooves (not shown) formed on the upper plastic part 300 and capable of engaging with the corresponding rotation preventing protrusions, and the plurality of rotation preventing engaging grooves are circumferentially distributed on the lower surface of the upper plastic part 300 and correspond to the periphery of the through hole 310 to engage with the cover plate 100 to realize rotation prevention. Specifically, the anti-rotation matching groove is formed by integrally recessing from the lower surface of the upper plastic part 300 in a direction away from the cover plate 100, and the shape and size of the anti-rotation matching groove are adapted to those of the anti-rotation protruding points, so that the anti-rotation matching groove can accommodate the anti-rotation protruding points at corresponding positions to limit the circumferential rotation of the upper plastic part 300 when the anti-rotation matching groove is press-fitted on the cover plate 100. Also, the anti-rotation matching portion 340 may also include an anti-rotation matching protrusion 341 and an anti-rotation matching groove at the same time corresponding to the anti-rotation portion 140 formed by the anti-rotation groove 141 and the anti-rotation protrusion, so as to implement circumferential anti-rotation of the upper plastic member 300.

Likewise, when the anti-rotation protruding points are arranged on the cover plate 100, and the anti-rotation matching grooves are arranged on the upper plastic part 300, the number of the anti-rotation matching grooves can be more than that of the anti-rotation protruding points, and preferably, the number of the anti-rotation matching grooves is multiple of the number of the anti-rotation protruding points, if six anti-rotation protruding points are arranged, twelve anti-rotation matching grooves are arranged, namely, one group of anti-rotation protruding points correspond to two groups of anti-rotation matching grooves, each group of anti-rotation matching grooves can be obtained by rotating any other group of anti-rotation matching grooves around the circumferential direction by any angle, so that at least one corresponding matched anti-rotation matching groove can be ensured for each anti-rotation protruding point, and when the upper plastic part 300 is assembled, the anti-rotation protruding points can be aligned with the anti-rotation matching grooves quickly and limited in the anti-rotation matching grooves after rotating by a certain angle. It can be appreciated that in other embodiments, the number of the anti-rotation matching grooves may be set corresponding to the number of the anti-rotation protrusions, that is, the anti-rotation matching grooves and the anti-rotation protrusions are set in a one-to-one correspondence to realize the matching anti-rotation of the upper plastic part 300 and the cover plate 100.

In this embodiment, the anti-rotation matching protruding points 341 and the anti-rotation matching grooves may be formed by injection molding with the upper plastic part 300 in the injection molding process of the upper plastic part 300, so that an anti-rotation matching structure is not required to be additionally arranged, and the battery top cover is quickly assembled.

In particular, when the pole 200 is defined as a first pole and/or a second pole, the upper plastic 300 is defined as a first upper plastic and/or a second upper plastic, the anti-rotation mating portion 340 is defined as a first anti-rotation mating portion 340 and/or a second anti-rotation mating portion 340, and the number and/or arrangement of anti-rotation mating protrusions 341 and/or anti-rotation mating grooves corresponding to the first anti-rotation mating portion 340 are adapted to the number and/or arrangement of anti-rotation grooves 141 and/or anti-rotation protrusions corresponding to the first anti-rotation portion 140, and the number and/or arrangement of anti-rotation mating protrusions 341 and/or anti-rotation grooves corresponding to the second anti-rotation mating portion 340 are adapted to the number and/or arrangement of anti-rotation protrusions 141 and/or anti-rotation protrusions corresponding to the second anti-rotation portion 140. That is, the number and/or arrangement of the anti-rotation matching protruding points 341 and/or the anti-rotation matching grooves corresponding to the first anti-rotation matching portion 340 are different from the number and/or arrangement of the anti-rotation matching protruding points 341 and/or the anti-rotation matching grooves corresponding to the second anti-rotation matching portion 340, so that the first upper plastic part and the second upper plastic part can be prevented from rotating circumferentially through the matching of the first anti-rotation matching portion 340 and the first anti-rotation portion 140 and the matching of the second anti-rotation matching portion 340 and the second upper plastic part, and the left and right foolproof of the first upper plastic part and the second upper plastic part can be realized.

The positioning matching portion 350 is disposed corresponding to the positioning portion 150, and the positioning matching portion 350 is formed on the inner side of the anti-rotation matching portion 340, so as to match with the positioning portion 150 to realize quick positioning of the upper plastic part 300. The positioning and matching portion 350 is defined as a positioning and matching annular groove 351 formed on the lower surface of the main body ring portion 320 of the upper plastic part 300 and matched with the positioning and matching convex ring 151, the positioning and matching annular groove 351 is disposed at the bottom of the upper plastic part 300 around the outer edge of the through hole 310 on the upper plastic part 300, the positioning and matching annular groove 351 is disposed corresponding to the positioning and matching convex ring 151 on the cover plate 100, and the size of the positioning and matching annular groove 351 is adapted to the size of the positioning and matching convex ring 151, so that the positioning and matching annular groove 351 can be extended into and positioned in the positioning and matching annular groove 351 when the upper plastic part 300 is supported on the upper surface of the cover plate 100, thereby realizing rapid positioning of the upper plastic part 300 and the cover plate 100.

In this embodiment, the positioning matching annular groove 351 is integrally injection molded with the upper plastic part 300, the concave surface of the positioning matching annular groove 351 (i.e. the surface of the positioning matching annular groove 351 recessed into the upper plastic part 300) is defined as a second supporting surface 352 directly contacting with the first supporting surface 152 on the positioning convex ring 151, and after the upper plastic part 300 is assembled in place, the second supporting surface 352 can be attached to the first supporting surface 152 and supported above the first supporting surface 152, so that the upper plastic part 300 can be stably supported on the cover plate 100. In particular, when the anti-rotation groove 141 and/or the anti-rotation protruding point are formed on the first supporting surface 152, the second supporting surface 352 may also be correspondingly used as a forming plane of the anti-rotation protruding point 341 and/or the anti-rotation matching groove, so that the anti-rotation protruding point 341 and/or the anti-rotation matching groove are integrally formed on the second supporting surface 352, and further the anti-rotation matching portion 340 and the positioning matching portion 350 are integrated in the same structure, thereby simplifying the forming process steps.

The second supporting surface 352 is correspondingly formed below the riveting position of the crimping portion in the vertical direction, so that when the positioning portion 150 is positioned in the positioning matching portion 350, the second supporting surface 352 is supported on the first supporting surface 152, and the upper surface of the main body ring portion 320 can transmit the pressure of the riveting device during the riveting operation to the first supporting surface 152 through the second supporting surface 352, so that the positioning convex ring 151 can support the main body ring portion 320, and the supporting strength of the upper plastic part 300 at the position can be ensured, so as to prevent the upper plastic part 300 from being cracked due to compression.

Correspondingly, in some other embodiments, when the positioning portion 150 is a positioning ring groove provided on the cover plate 100, the positioning mating portion 350 may also be a positioning mating protruding ring (not shown) provided on the upper plastic part 300, where the positioning mating protruding ring integrally protrudes downward from the lower surface of the upper plastic part 300, and when positioning, the positioning mating protruding ring may extend into the positioning ring groove to mate with the positioning ring groove to achieve quick positioning of the upper plastic part 300, and at this time, the second supporting surface 352 is an outer protruding surface of the positioning mating protruding ring to support the upper plastic part 300.

Referring to fig. 3 and 11, the lower plastic member 400 is disposed at the lower side of the cover plate 100 and is pressed between the lower surface of the cover plate 100 and the pole 200 to isolate the lower surface of the cover plate 100 from the pole 200. In this embodiment, the lower plastic member 400 is an integral plate-shaped member adapted to the shape of the cover plate 100, and a through hole 410 for the pole 200 to pass through is provided at the position of the lower plastic member 400 corresponding to the pole mounting hole 110, and because the sealing ring 500 is sleeved outside the pole 200, for facilitating the assembly of the sealing ring 500, the aperture of the through hole 410 is slightly larger than the outer diameter of the sealing ring 500, so that the sealing ring 500 penetrates into the through hole 410 along with the pole 200 to seal the assembly gap.

The upper surface of the lower plastic part 400 is provided with a press-fit ring 420 that cooperates with the cover plate 100 to position, specifically, the press-fit ring 420 surrounds the outer edge of the through hole 410, and the press-fit ring 420 is arranged corresponding to the press-fit groove 160, so that when the cover plate 100 and the lower plastic part 400 are assembled, the cover plate 100 and the lower plastic part 400 can be positioned and assembled through the press-fit ring 420 and the press-fit groove 160. It can be appreciated that, in other embodiments, when the cover plate 100 is provided with a press-fit ring, the lower plastic part 400 may be correspondingly provided with a press-fit groove capable of accommodating the press-fit ring to position the cover plate 100 and the lower plastic part 400.

The lower surface of the lower plastic member 400 is concave at a position corresponding to the through hole 410 to form a limit groove set, and the shape of the limit groove set is adapted to the shape of the base 210, so that the base 210 can be limited in the limit groove set after the column 220 sequentially passes through the through hole 410 and the pole mounting hole 110 from bottom to top. In this embodiment, the limiting groove set includes a first limiting groove 430 corresponding to the first pole and/or a second limiting groove 440 corresponding to the second pole, corresponding to the square base, where the first limiting groove 430 and the second limiting groove 440 are defined as square limiting grooves, and at least three sides of the first base and/or the second base are adapted to the groove walls of the first limiting groove 430 and the second limiting groove 440, so that the circumferential anti-rotation of the pole 200 can be realized while the anti-fool is realized by matching with the square base.

In particular, a first foolproof matching portion 431 for matching with the first foolproof portion 250 to realize the installation of the first pole is disposed in the first limiting groove 430, a second foolproof matching portion 441 for matching with the second foolproof portion 260 to realize the installation of the second pole is formed at a position corresponding to the second foolproof portion 260 in the second limiting groove 440, and thus, the first pole and the second pole are assembled and foolproof by matching the first foolproof matching portion 431 and/or the second foolproof matching portion 441 with the first foolproof portion 250 and/or the second foolproof portion 260, so that the reverse installation of the positive pole and the negative pole of the power battery is avoided. The first fool-proof engaging portion 431 is a first protrusion disposed on a groove wall of the first limiting groove 430 and corresponding to the first notch, the second fool-proof engaging portion 441 is a second protrusion disposed on a groove wall of the second limiting groove 440 and corresponding to the second notch, the first protrusion and the second protrusion are triangular protrusions complementary to the triangular notch, when the pole 200 is assembled, the first notch can only be correspondingly engaged with the lower plastic member 400 on the mounting side of the first pole and accommodate the corresponding first protrusion, and the second notch can only be correspondingly engaged with the lower plastic member 400 on the mounting side of the second pole and correspondingly accommodate the second protrusion, so that when the first pole and the second pole are reversely assembled, the first pole and the second pole cannot be assembled in place due to the existence of the first fool-proof portion 250 and the second fool-proof portion 260, thereby realizing fool-proof of the first pole and the second pole.

Correspondingly, the first limit groove 430 and the second limit groove 440 may be defined as circular limit grooves, and the first protrusion and the second protrusion are semicircular or arc protrusions complementary to the semicircular or arc notch, so as to cooperatively implement foolproof of the first pole and the second pole.

Referring to fig. 3 and 12, the seal ring 500 is sleeved on the outer periphery of the pole 200 and is located between the pole 200 and the lower plastic member 400. When the pole 200 is assembled in place, the upper surface of the seal ring 500 abuts against the lower surface of the cap plate 100 and the lower surface of the seal ring 500 abuts against the upper surface of the base 210, so as to seal the internal space of the power battery, and prevent the electrolyte from leaking. In this embodiment, an assembling groove 510 is formed on the upper surface of the seal ring 500 at a position corresponding to the annular spacer groove 600, such that when the end of the isolating ring 330 extends out of the annular spacer groove 600, the end of the isolating ring 330 can extend into the assembling groove 510 and abut against the bottom of the assembling groove 510 to receive the end of the isolating ring 330. The arrangement of the assembly groove 510 can close the assembly gap between the upper plastic member 300 and the pole 200 to ensure the sealing effect, and can lengthen the path of the electrolyte to permeate outwards to further increase the sealing performance.

In other embodiments, the sealing ring 500 may be omitted, and the sealing ring 500 may be simplified by integrally forming a portion of the lower plastic member 400 corresponding to the post mounting hole 110, which can extend into the post mounting hole 110, or by providing a portion of the lower plastic member 400, which can abut against between the lower surface of the cover plate 100 and the upper surface of the base 210, to isolate the post 200 from the cover plate 100, thereby simplifying the assembly process.

Referring back to fig. 2, the battery top cover further includes an explosion-proof assembly 700 press-mounted on the cover plate 100, where the explosion-proof assembly 700 is press-mounted in the explosion-proof mounting hole 130, so as to timely release pressure inside the power battery and prevent explosion caused by excessive internal pressure. The explosion-proof assembly 700 includes an explosion-proof sheet 710 disposed in the explosion-proof mounting hole 130 and a protective film 720 disposed on the upper surface of the cover plate 100 to cover the explosion-proof mounting hole 130, wherein the explosion-proof sheet 710 is capable of being torn to release pressure when the internal pressure of the power battery is too high.

Referring to fig. 1 to 13, when the battery top cover of the present utility model is assembled, firstly, a preformed cover plate 100, a post 200, an upper plastic member 300, a lower plastic member 400 and a sealing ring 500 are provided, wherein the post 200 is the post 200 shown in fig. 7, which is not riveted, and the cover plate 100 is pre-assembled with an explosion-proof assembly 700; then, the pole 200 is put into riveting equipment for fixing and the sealing ring 500 is sleeved on the periphery of the column 220; next, placing the lower insulating member on the pole 200, sleeving the through hole 410 on the lower plastic member 400 outside the column 220 in a ring manner, positioning the base 210 of the pole 200 in the limit groove, abutting the upper surface of the base 210 against the bottom of the limit groove, matching the first notch with the first protrusion and the second notch with the second protrusion, placing the cover plate 100 on the lower insulating member, allowing the column 220 to pass through the pole mounting hole 110 upwards, abutting the upper surface of the sealing ring 500 against the lower surface of the cover plate 100, and exposing the assembly groove 510 from the interval ring groove 600; then, the upper plastic 300 is sleeved outside the column 220 and supported on the cover plate 100 through the matching of the positioning convex ring 151 and the positioning matching annular groove 351, meanwhile, the isolating ring 330 extends into the spacing annular groove 600, the tail end of the isolating ring 330 is correspondingly positioned above the assembling groove 510, the upper plastic 300 is circumferentially rotated, the anti-rotation matching convex point 341 is pressed into the anti-rotation groove 141, and the tail end of the isolating ring 330 extends into the assembling groove 510 and abuts against the bottom of the assembling groove 510 to fix the upper plastic 300; finally, the ring body 240 is downwardly punched by riveting equipment, so that the ring body 240 is bent outwards by 90 degrees to form a pressing part 230 to be pressed on the upper surface of the main body ring part 320, thereby completing the assembly of the cover plate 100, the pole 200, the upper plastic part 300, the sealing ring 500 and the lower plastic part 400.

According to the battery top cover, the pressing part 230 is arranged at the top of the pole 200, the pressing part 230 is formed by riveting and folding after the annular body 240 at the top of the pole 200 is assembled in place to press and hold the pole 200 on the upper plastic part 300, and meanwhile, the first limit groove 430 and the second limit groove 440 are arranged at the bottom of the lower plastic part 400, so that the base 210 of the pole 200 can be limited in the first limit groove 430 and the second limit groove 440 to limit the axial displacement of the pole 200, the fixing of the pole 200 is realized, the pole 200 does not need to be welded without forming a pole 200 ring, the assembly procedure is few, and the assembly efficiency can be effectively improved. Meanwhile, the first foolproof matching portion 431 and the second foolproof matching portion 441 are respectively disposed in the first limiting groove 430 and the second limiting groove 440, and the first foolproof portion 250 and the second foolproof portion 260 disposed on the base 210 are correspondingly matched to synchronously realize positive and negative foolproof and circumferential rotation prevention of the pole 200, thereby increasing the assembly stability of the pole 200.

In addition, the upper plastic part 300 is prefabricated and formed, in-mold injection is not needed, injection equipment and a mold can be saved, high temperature is avoided, and therefore the sealing ring 500 is prevented from being deformed due to heating, and the sealing effect is good. Moreover, by arranging the anti-rotation groove 141 on the cover plate 100 and correspondingly arranging the anti-rotation matching convex points 341 on the upper plastic part 300, the multiple functions of positioning, anti-rotation and foolproof of the upper plastic part 300 in the assembly process can be realized at the same time, the quick assembly of the battery top cover is facilitated, and the assembly efficiency is provided.

Claims (10)

1. A battery top cover, comprising:

the cover plate is provided with a pole mounting hole group;

the pole group is arranged in the pole mounting hole group in a penetrating manner, and the top of the pole group is provided with a pressing part group;

the upper plastic part group is supported on the cover plate, and the pressing part group is riveted and pressed on the upper plastic part group; and

the lower plastic part is connected to the bottom of the cover plate, and a limit groove group matched with the pole group for limiting is arranged at the bottom of the lower plastic part.

2. The battery top cover according to claim 1, wherein the pole group comprises a first pole and a second pole, the limit groove group of the lower plastic part comprises a first limit groove and a second limit groove which are respectively arranged corresponding to the first pole and the second pole, the shapes of bases of the first pole and the second pole are matched with the shapes of the first limit groove and the second limit groove, so that the first pole is limited in the first limit groove, and the second pole is limited in the second limit groove.

3. The battery top cover according to any one of claims 1-2, wherein the pole group comprises a base, a column body arranged on the base and an annular body arranged on the outer edge of the top of the column body, the annular body is riveted outwards after the pole group is assembled in place to form the holding part group, and the column body sequentially penetrates through the lower plastic part and the cover plate from bottom to top.

4. The battery top cover according to claim 1, wherein a press-fit groove group surrounding the edge of the pole mounting hole group is formed at the bottom of the cover plate, and a press-fit ring group which is matched with the press-fit groove group to position the cover plate and the lower plastic part is arranged at the top of the lower plastic part.

5. A battery top cover according to claim 3, wherein the shape of the base is defined as a circular arc and/or a shape surrounded by three or more sides.

6. The battery top cover according to claim 2, wherein the upper plastic member group comprises a main body ring portion supported on the cover plate and a spacer ring portion integrally extending downwards from an inner peripheral surface of the main body ring portion, the pressing portion is pressed on the main body ring portion, and the spacer ring portion is sleeved in the pole mounting hole group.

7. The battery top cover according to claim 6, wherein an anti-rotation portion is formed on the lower surface of the main body ring portion along the circumferential direction, and an anti-rotation matching portion which is matched with the anti-rotation portion to realize circumferential anti-rotation of the upper plastic component group is arranged on the cover plate at a position corresponding to the anti-rotation portion.

8. The battery top cover according to claim 7, wherein the rotation preventing part comprises a plurality of rotation preventing protruding points and/or a plurality of rotation preventing grooves which are circumferentially distributed, the rotation preventing matching part comprises a plurality of rotation preventing matching grooves and/or rotation preventing matching protruding points which are circumferentially distributed, and the rotation preventing protruding points are matched with the rotation preventing matching grooves and/or the rotation preventing protruding points to realize circumferential rotation preventing of the upper plastic part.

9. The battery top cover of claim 8, wherein the upper plastic component set comprises a first upper plastic component and a second upper plastic component, the pressing component set comprises a first pressing component formed on the first pole and a second pressing component formed on the second pole, the first upper plastic component ring is sleeved outside the first pole and the first pressing component is pressed on the first upper plastic component, the second upper plastic component ring is sleeved outside the second pole and the second pressing component is pressed on the second upper plastic component.

10. The battery top cover of claim 9, wherein the arrangement of the corresponding anti-rotation bumps and/or grooves on the first upper plastic part is different from the arrangement of the anti-rotation mating bumps and/or grooves on the second upper plastic part.