CN220652291U - Battery top cover positioning structure and power battery top cover - Google Patents

Abstract

The utility model discloses a battery top cover positioning structure and a power battery top cover, which comprise a cover plate penetrating through a pole mounting hole and an upper plastic part pressed on the cover plate and corresponding to the position of the pole mounting hole, wherein a positioning part is formed on the upper surface of the cover plate at the position corresponding to the pole mounting hole, and a positioning matching part matched with the positioning part for positioning the upper plastic part is formed on the bottom of the upper plastic part at the position corresponding to the positioning part. Compared with the prior art, the circumferential anti-rotation device has the advantages that the positioning part and the positioning matching part are in limit matching, so that the circumferential anti-rotation device is simple in structure and convenient to assemble.

Description

Battery top cover positioning structure and power battery top cover

Technical Field

The utility model relates to the technical field of power batteries, in particular to a battery top cover positioning structure and a power 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, go up the plastic part and adopt injection moulding mostly, do not relate to the location problem of plastic part on the location for all do not set up corresponding location structure on current apron and the last plastic part and realize going up the quick location of plastic part in the equipment process. Therefore, it is needed to design a positioning structure with a simple structure to quickly position the prefabricated upper plastic part, so as to improve the assembly efficiency of the top cover of the power battery.

Disclosure of Invention

Therefore, the present utility model is directed to a battery top cover positioning structure and a power battery top cover, so as to solve the problems of the prior art that the prefabricated upper plastic part cannot be positioned quickly and the assembly efficiency is low.

In order to achieve the above-mentioned objective, a technical scheme of the present utility model provides a battery top cover positioning structure, which comprises a cover plate penetrating through and forming a pole mounting hole, and an upper plastic part press-fitted on the cover plate and corresponding to the pole mounting hole, wherein a positioning portion is formed on the upper surface of the cover plate corresponding to the pole mounting hole, and a positioning matching portion for matching with the positioning portion to position the upper plastic part is formed on the bottom of the upper plastic part corresponding to the positioning portion.

Further, the positioning part is a positioning convex ring arranged around the outer edge of the pole mounting hole, and the positioning matching part is a positioning matching ring groove formed at the bottom of the upper plastic part and in limit matching with the positioning convex ring; or alternatively

The positioning convex ring is a positioning annular groove arranged around the outer edge of the pole mounting hole, and the positioning matching part is a positioning matching convex ring which is formed at the bottom of the upper plastic part and is in limiting fit with the positioning annular groove.

Further, the outer convex surface of the positioning convex ring or the inner concave surface of the positioning annular groove is defined as a first supporting surface, and the inner concave surface of the positioning matching annular groove or the outer convex surface of the positioning matching convex ring is defined as a second supporting surface supported on the first supporting surface.

Further, a plurality of anti-rotation protruding points protruding to the upper plastic part are integrally formed on the cover plate, the anti-rotation protruding points are circumferentially distributed on the cover plate, anti-rotation matching grooves for correspondingly accommodating the anti-rotation protruding points are formed on the upper plastic part at positions corresponding to the anti-rotation protruding points, and the anti-rotation protruding points are matched with the anti-rotation matching grooves to realize circumferential anti-rotation of the upper plastic part; or alternatively

The cover plate is provided with a plurality of recessed anti-rotation grooves, the anti-rotation grooves are circumferentially distributed on the cover plate, the position corresponding to the anti-rotation grooves on the upper plastic part is provided with anti-rotation matching convex points which correspondingly protrude into the anti-rotation grooves, and the anti-rotation grooves and the anti-rotation matching convex points are matched to realize circumferential anti-rotation of the upper plastic part.

Further, the upper plastic part comprises a main body ring part supported on the cover plate, an upper ring part which is arranged on the outer periphery of the main body ring part in a surrounding manner and integrally protrudes upwards to form, and a lower ring part which is arranged on the inner periphery of the main body ring part in a surrounding manner and integrally protrudes downwards to form, the positioning matching part is formed on the lower surface of the main body ring part, and when the upper plastic part is supported on the cover plate, the lower ring part protrudes into the pole mounting hole and is matched with the pole to seal the pole mounting hole.

Further, the size of the outer peripheral surface of the lower ring portion is adapted to the size of the inner peripheral surface of the pole mounting hole, a through hole for the pole to pass through is formed in the main body ring portion, and when the pole passes through the through hole, the corresponding position of the pole presses the upper plastic part and enables the outer peripheral surface of the lower ring portion to abut against the outer peripheral surface of the pole mounting hole.

Further, a receiving groove for receiving the pole is formed in the upper plastic part; the receiving groove is formed on the upper surface of the upper plastic part and corresponds to the position above the positioning matching part, so that the receiving groove can be supported above the positioning part.

In order to achieve the above object, another technical scheme of the present utility model provides a top cover of a power battery, which comprises the above-mentioned positioning structure of the top cover of the power battery, a pole disposed in the pole mounting hole, a sealing ring press-fitted between the pole and the cover plate, and a lower plastic member.

Further, the pole penetrates into the pole mounting hole from the lower side of the cover plate and penetrates out of the upper side of the cover plate, and the penetrating end of the pole is formed with a riveting part which is turned outwards and is in pressure connection with the upper plastic part.

Further, the pole comprises a base positioned at the lower side of the cover plate and a column body integrally formed on the upper surface of the base, and the riveting part integrally extends outwards from the outer edge of one end, far away from the base, of the column body; the post is limited to be long strip-shaped, the post mounting hole is limited to be a strip-shaped hole matched with the shape of the post, and the post penetrates into the post mounting hole from the lower side of the cover plate so that the riveting part can be pressed into the upper plastic part.

According to the utility model, the positioning part arranged on the cover plate is matched with the positioning matching part arranged at the bottom of the upper plastic part, so that the upper plastic part can be rapidly positioned during assembly, and the anti-rotation of the pole can be realized by combining the pole with the strip-shaped structure, so that the reliability of pole fixing is improved. Simultaneously, the locating part is protruding upwards and corresponds the below that is located the receiving tank for when the riveting, go up the plastic part and can support on the locating part, with the structural strength who guarantees to go up the plastic part and correspond in this position department, avoid going up the plastic part fracture, ensure power battery quality.

In addition, the bottom of the column body is provided with the bottom limiting part of the base and the cover plate, and the top of the column body is provided with the riveting part which is turned outwards by adopting a riveting process, so that the riveting part can be pressed in the receiving groove of the upper plastic part after forming, the fixing of the pole body is realized, the whole process only needs to assemble the cover plate, the pole body, the upper plastic part, the sealing ring and the lower plastic part and then place the cover plate, the pole body, the upper plastic part, the sealing ring and the lower plastic part in riveting equipment for forming the riveting part, the assembling process is less, high-temperature operation is not needed, the deformation of the sealing ring can be effectively avoided, and the sealing effect is good.

Drawings

Fig. 1 is a schematic view of the power battery top cover of the present utility model.

Fig. 2 is an exploded view of fig. 1.

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

Fig. 4 is a schematic structural view of the cover plate.

Fig. 5 is a schematic structural view of a pole.

Fig. 6 is a schematic structural view of the post prior to crimping.

Fig. 7 is a schematic structural diagram of the upper plastic part.

Fig. 8 is another schematic structural view of the upper plastic part.

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

Fig. 10 is a view from the direction of B-B in fig. 1.

Fig. 11 is a schematic view of fig. 10 prior to pole staking.

The specification reference numerals are as follows:

the cover plate 100, the pole mounting hole 110, the positioning part 120, the positioning convex ring 121, the first supporting surface 122, the second first limiting groove 130 and the explosion-proof mounting hole 140;

post 200, rivet 210, base 220, post 230, ring 240;

the upper plastic 300, the through hole 310, the receiving groove 320, the positioning and matching part 330, the positioning and matching ring groove 331, the second supporting surface 332, the main body ring 340, the upper ring 350, and the lower ring 360;

seal ring 400, press-holding ring portion 410, and plugging ring portion 420;

the lower plastic part 500, the first through hole 510, the limit fit convex ring 520, the first limit groove 530 and the second through hole 540;

assembly gap 600;

explosion proof assembly 700, explosion proof sheet 710, protective film 720.

Detailed Description

The following is a further detailed description of the embodiments:

examples

Referring to fig. 1, 2 and 3, the top cover of the power battery of the present utility model includes a cover plate 100, a pole 200 disposed on the cover plate 100, an upper plastic member 300, a sealing ring 400 and a lower plastic member 500 disposed between the cover plate 100 and the pole 200 for insulating and sealing the cover plate 100 and the pole 200; the cover plate 100 is formed with a pole mounting hole 110, and the pole 200 penetrates from the lower side of the cover plate 100 and is fixed in the pole mounting hole 110. The cover plate 100 is correspondingly formed with an explosion-proof mounting hole 140 and/or a liquid injection hole (not shown), wherein the explosion-proof mounting hole 140 is used for mounting the explosion-proof assembly 700, and the liquid injection hole is used for injecting electrolyte into the battery. In particular, some power batteries are generally configured with a positive top cover and a negative top cover at two opposite ends of the power battery, where the positive top cover and the negative top cover are separately disposed, a positive post is disposed in the positive top cover and is insulated and sealed by a positive plastic part, a positive sealing ring and a positive plastic part, and a negative post is disposed in the negative top cover and is insulated and sealed by a negative plastic part, a negative sealing ring and a negative plastic part, and the explosion-proof mounting hole 140 is generally disposed on the positive cover and the liquid injection hole is disposed on the negative cover. Of course, in other embodiments, the explosion-proof mounting hole 140 may be disposed on the negative electrode cover plate and the injection hole is disposed on the positive electrode cover plate, or two parallel post mounting holes 110 may be disposed on the cover plate 100 to accommodate the post 200, the upper plastic member 300, the sealing ring 400 and the lower plastic member 500 of the positive electrode and the negative electrode, respectively, and the explosion-proof mounting hole 140 and the injection hole may be disposed on the cover plate 100.

Referring to fig. 4, the pole mounting hole 110 is defined as a strip-shaped hole with a strip-shaped structure, the pole 200 is fittingly mounted in the pole mounting hole 110, the pole mounting hole 110 has a first long axis along the length direction of the cover plate 100 and a first short axis along the width direction of the cover plate 100, and the first long axis is not equal to the first short axis, so that the rotation range of the pole 200 can be limited. It will be appreciated that in other embodiments, the post mounting hole 110 may be defined as a square hole to limit the axial rotation range of the post 200, or the post mounting hole 110 may be defined as a circular hole, and when the post mounting hole 110 is a circular hole, the rotation prevention of the post 200 may be achieved by the engagement of the bottom of the post 200 with the lower plastic 500 (specifically described in the lower plastic 500).

The upper surface of the cover plate 100 is formed with a positioning portion 120 surrounding the pole mounting hole 110, the positioning portion 120 is similar to the pole mounting hole 110 in shape, and the positioning portion 120 can be matched with the bottom of the upper plastic piece 300 to realize quick positioning of the upper plastic piece 300, so as to improve assembly efficiency. In this embodiment, the positioning portion 120 is preferably a positioning convex ring 121 disposed around an outer edge of the pole mounting hole 110, the positioning convex ring 121 integrally protrudes upward from an upper surface of the cover plate 100, and when the upper plastic member 300 is press-mounted on the cover plate 100, the positioning convex ring 121 can be positioned at the bottom of the upper plastic member 300. The outer convex surface of the positioning convex ring 121 is defined as a first supporting surface 122 to stably support the upper plastic 300 after the assembly of the upper plastic 300 is completed, in conformity with the shape of the pole mounting hole 110. The positioning convex ring 121 is defined as a strip convex ring distributed along the length direction of the cover plate 100, the first inner diameter and the first outer diameter of the positioning convex ring 121 along the length direction of the cover plate 100 are different from the corresponding second inner diameter and second outer diameter along the width direction of the cover plate 100, and when the positioning mating portion 330 is positioned on the positioning convex ring 121, the positioning convex ring 121 can limit the circumferential rotation and the quick positioning of the plastic part 300 on the whole through the inner diameter and the outer diameter of the positioning convex ring 121 which are different in the length direction and the width direction of the cover plate 100. Of course, in a specific implementation, the positioning convex ring 121 may also be a square convex ring or a circular convex ring that is adapted to the shape of the pole mounting hole 110.

It should be appreciated that, in other embodiments, the positioning portion 120 may also be a positioning ring groove (not shown) disposed around an outer edge of the pole mounting hole 110, and the positioning ring groove is formed by integrally recessing from an upper surface of the cover plate 100, and at this time, a structure capable of extending into the positioning ring groove may be disposed at a bottom of the upper plastic part 300 to cooperate with the positioning ring groove to achieve quick positioning of the upper plastic part 300, and at this time, the first supporting surface 122 is a concave surface of the positioning ring groove to support the upper plastic part 300. The positioning ring groove is defined as an elongated ring groove distributed along the length direction of the cover plate 100, wherein the third inner diameter and the third outer diameter of the positioning ring groove along the length direction of the cover plate 100 are not equal to the fourth inner diameter and the fourth outer diameter corresponding to each other along the width direction of the cover plate 100, and when the positioning matching portion 330 is positioned in the positioning ring groove, the circumferential rotation and the quick positioning of the whole upper plastic part 300 can be limited by the inner diameter and the outer diameter of the positioning ring groove which are not equal to each other along the length direction and the width direction of the cover plate 100. Also, in a specific implementation, the shape of the positioning ring groove may be adaptively designed to be similar to the shape of the pole mounting hole 110 according to the shape of the pole mounting hole 110.

As a preferred mode of this embodiment, in order to realize the anti-rotation of the upper plastic part 300, a plurality of anti-rotation bumps (not shown) protruding to the upper plastic part 300 are integrally formed on the cover plate 100, and the plurality of anti-rotation bumps are circumferentially distributed on the cover plate 100, so that after the upper plastic part 300 is assembled in place, the anti-rotation bumps extend into the bottom of the upper plastic part 300 to realize the circumferential anti-rotation of the upper plastic part 300. In particular, the anti-rotation protruding point integrally protrudes upwards from the upper surface of the cover plate 100 and corresponds to the position outside the positioning portion 120 to extend into the bottom of the upper plastic part 300 to realize anti-rotation of the upper plastic part 300; in addition, the anti-rotation protruding point may be integrally formed by protruding upwards from the first supporting surface 122, so as to extend into the corresponding position of the positioning matching portion 330 of the upper plastic part 300 to realize anti-rotation of the upper plastic part 300; furthermore, the anti-rotation bumps may be disposed on the cover plate 100 and the first supporting surface 122 to respectively cooperate with the bottom of the upper plastic part 300 and the positioning and matching portion 330 to realize anti-rotation of the upper plastic part 300.

It will be appreciated that in other embodiments, a plurality of anti-rotation grooves (not shown) may be disposed on the upper surface of the cover plate 100 and/or the first supporting surface 122, the plurality of anti-rotation grooves are circumferentially distributed on the cover plate 100 and/or the first supporting surface 122, and the anti-rotation grooves are formed by recessing the upper surface of the cover plate 100 and/or the surface of the first supporting surface 122, so that after the upper plastic part 300 is assembled in place, the anti-rotation of the upper plastic part 300 is achieved by matching with corresponding structures on the bottom or the positioning matching portion 330 of the upper plastic part 300.

The lower surface of the cover plate 100 is formed with a second limit groove 130 encircling the outer edge of the pole mounting hole 110, the second limit groove 130 is arranged around the outer edge of the pole mounting hole 110 and is formed by integrally and upwardly recessing the lower surface of the cover plate 100, so as to cooperate with the lower plastic part 500 to realize the positioning of the lower plastic part 500, and the lower plastic part 500 is convenient to be accurately pressed at the bottom of the cover plate 100. It should be appreciated that in other embodiments, the second limiting groove 130 may be configured as a positioning convex ring integrally protruding downward from the lower surface of the cover plate 100, so as to cooperate with the lower plastic member 500 to achieve positioning, etc.

Referring to fig. 5, the pole 200 penetrates into the pole mounting hole 110 from the lower side of the cover plate 100 and passes out of the upper side of the cover plate 100, so that the top of the pole 200 is exposed on the upper surface of the cover plate 100, a rivet 210 is formed on the protruding end of the pole 200, which is turned outwards and can be crimped on the upper plastic 300, and the bottom of the pole 200 is positioned in cooperation with the lower side of the cover plate 100 and fixed by the lower plastic 500, and the top of the pole 200 is fixed in cooperation with the upper plastic 300 by the rivet 210. In this embodiment, the riveting portion 210 is an annular flange formed on the top of the pole 200 by a riveting process, and the annular flange is disposed around the top outer edge of the pole 200 and integrally extends radially outward from the outer peripheral surface of the pole 200 on the top outer edge of the pole 200, so as to be capable of being pressed against the upper plastic member 300.

The pole 200 includes a base 220 positioned at the lower side of the cover plate 100 and a column 230 integrally formed from the upper surface of the base 220, wherein the base 220 is disposed at a lower side of the cover plate 100 at intervals and is isolated from the cover plate 100 by a lower plastic member 500, and the column 230 is inserted into the pole mounting hole 110 from the lower side of the cover plate 100 and passes out of the pole mounting hole 110 upward to be exposed at the upper surface of the cover plate 100.

In this embodiment, the riveting portion 210 is integrally formed on the column 230 and corresponds to an outer edge of one end far away from the base 220, 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 member 500 through the upper surface of the base 220, and the top of the pole 200 is positioned by pressing the riveting portion 210 against the upper plastic member 300, so as to limit the axial displacement of the pole 200. An assembly gap 600 for accommodating the upper plastic member 300 is formed between the outer circumferential surface of the post 230 and the pole mounting hole 110, so that after the assembly is in place, the corresponding position of the bottom of the upper plastic member 300 can be pressed between the outer circumferential surface of the post 230 and the inner circumferential surface of the pole mounting hole 110 to limit the radial displacement of the pole 200. The cylinder 230 is defined as an elongated shape similar to the shape of the post mounting hole 110, and the cylinder 230 has a second long axis along the length direction of the cap plate 100 and a second short axis along the width direction of the cap plate 100, which correspond to less than the first long axis and the second short axis, respectively, to form the assembly gap 600 between the outer circumferential surface of the cylinder 230 and the inner circumferential surface of the post mounting hole 110; the second long axis of the post 230 is not equal to the second short axis, and the rotation track of the distal end of the post 230 is determined by the long axis when the post 230 rotates in the circumferential direction, and since the size of the post mounting hole 110 is similar to the shape of the bar-shaped hole and the upper plastic member 300 is supported on the cover plate 100 and pressed between the post 200 and the post mounting hole 110, the circumferential rotation of the post 200 is limited.

The shape of the base 220 is similar to that of the column 230, and the area of the base 220 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 220 can completely cover the pole mounting hole 110, and the upper surface of the base 220 corresponding to the outside of the column 230 is at least partially overlapped with the cover plate 100 and is abutted against the lower plastic member 500, so as to realize the positioning of the bottom of the pole 200. It should be appreciated that, in other embodiments, the shape of the base 220 need not be similar to that of the post 230, and it may be implemented by a circular base 220 or a square base 220 with a conventional structure, which is only required to satisfy that the area of the base 220 on the horizontal projection plane is larger than the post mounting hole 110 and can abut against the lower plastic member 500.

Referring to fig. 6, 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 230, the annular body 240 is disposed around the top outer edge of the post 230 and extends upward integrally from the upper surface of the post 230 on the outer edge of the top of the post 230, and after the post 200 is assembled with the cover plate 100, the upper plastic member 300, the seal ring 400 and the lower plastic member 500, the post 200 can be placed in a riveting device to rivet the annular body 240, so that the annular body 240 is bent outwards by 90 ° and then is pressed on the upper plastic member 300, thereby fixing the post 200.

Referring to fig. 7 and 8, 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 assembly gap 600, thereby increasing the tightness of the whole top cover. Preferably, a receiving groove 320 is formed at the top of the upper plastic part 300 for pressing the riveting part 210, the shape of the receiving groove 320 is adapted to the shape of the riveting part 210, and the size of the receiving groove 320 is slightly larger than the size of the riveting part 210, so as to adapt to the micro deformation of the riveting part 210 caused by stretching and stamping in the riveting process. It should be appreciated that in other embodiments, the top of the upper plastic 300 may not be provided with the receiving groove 320, and the riveting portion 210 of the pole 200 may be directly pressed against the upper surface of the upper plastic 300 during riveting.

In this embodiment, the positioning structure is formed by the upper plastic part 300 and the cover plate 100, so that the upper plastic part 300 can be positioned in the installation process of the upper plastic part 300, so that the upper plastic part 300 can be quickly assembled on the cover plate 100. Specifically, a positioning matching portion 330 that can be matched with the positioning portion 120 to position the upper plastic part 100 is formed at the bottom of the upper plastic part 300 corresponding to the positioning portion 120. In this embodiment, the positioning and matching portion 330 is defined as a positioning and matching annular groove 331 formed at the bottom of the upper plastic part 300 and in spacing fit with the positioning and matching convex ring 121, the positioning and matching annular groove 331 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 331 is disposed corresponding to the positioning and matching convex ring 121 on the cover plate 100, and the size of the positioning and matching annular groove 331 is adapted to the size of the positioning and matching convex ring 121, since the positioning and matching annular groove 121 and the positioning and matching annular groove 331 are both elongated and shaped similar to the pole mounting hole 110 and the pole 200, the positioning and matching convex ring 121 can extend into and be positioned in the positioning and matching annular groove 331 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. The concave surface of the positioning ring groove 331 is defined as a second supporting surface 332, and the second supporting surface 332 is attached to and supported on the first supporting surface 122 after the upper plastic part 300 is assembled in place. Corresponding to the shape of the positioning convex ring 121, the positioning matching annular groove 331 is defined as an elongated annular groove that is adapted to the shape of the positioning convex ring 121 and can accommodate the positioning convex ring 121, so that the upper plastic member 300 can be quickly positioned with the cover plate 100 during assembly.

It should be appreciated that, in some other embodiments, when the positioning portion 120 is configured as a positioning ring groove, the positioning mating ring groove 331 on the upper plastic member 300 may also be configured as a positioning mating protruding ring (not shown) corresponding to the positioning ring groove, and the positioning mating protruding ring extends into and is positioned in the positioning ring groove when the upper plastic member 300 is supported on the upper surface of the cover plate 100 to achieve the purpose of quick positioning of the upper plastic member 300, where the second supporting surface 332 is an outer convex surface of the positioning mating protruding ring, so as to be in fit support with the first supporting surface 122 formed by an inner concave surface of the positioning ring groove. The location matching convex ring is defined to be a strip convex ring which is matched with the shape of the location ring groove and can be matched with and accommodate the location ring groove, corresponding to the shape of the location ring groove, so that the upper plastic part 300 can be quickly located with the cover plate 100 when being assembled.

Correspondingly, for the cooperation realization is gone up the anti-rotating of plastic part 300, go up and be provided with a plurality of anti-rotating cooperation recess on the plastic part 300, a plurality of anti-rotating cooperation recess set up in the bottom of plastic part 300 along the circumference of last plastic part 300, a plurality of anti-rotating cooperation recess and anti-rotating bump one-to-one set up, and anti-rotating cooperation recess is formed by the surface depression of the bottom of last plastic part 300 for after last plastic part 300 equipment, anti-rotating bump can stretch into in the anti-rotating cooperation recess in order to realize the circumference of going up plastic part 300 and prevent changeing. In particular, the anti-rotation matching groove is formed by recessing upwards from the lower surface of the upper plastic part 300 to match with the anti-rotation protruding point positioned on the upper surface of the cover plate 100 after the upper plastic part 300 is assembled in place, so as to realize anti-rotation of the upper plastic part 300; in addition, the anti-rotation matching groove may be formed by integrally recessing upwards from the surface of the second supporting surface 332, so as to match with the anti-rotation protruding point provided on the first supporting surface 122 to realize anti-rotation of the upper plastic part 300; furthermore, the anti-rotation matching grooves may be disposed on the lower surface of the upper plastic 300 and the second supporting surface 332 to respectively match with the anti-rotation protrusions on the upper surface of the cover plate 100 and the first supporting surface 122 to realize the circumferential anti-rotation of the upper plastic 300.

Similarly, when the anti-rotation grooves are formed on the upper surface of the cover plate 100 and/or the first supporting surface 122, a plurality of anti-rotation matching protruding points corresponding to the anti-rotation grooves are arranged on the lower surface of the upper plastic part 300 and/or the second supporting surface 332, the anti-rotation matching protruding points are circumferentially distributed on the lower surface of the upper plastic part 300 and/or the second supporting surface 332, and the anti-rotation matching protruding points integrally protrude from the lower surface of the upper plastic part 300 and/or the surface of the second supporting surface 332 towards the upper surface of the cover plate 100 and/or the first supporting surface 122, so that after the upper plastic part 300 is assembled, the anti-rotation matching protruding points can extend into the anti-rotation grooves to realize circumferential anti-rotation of the upper plastic part 300.

The upper plastic part 300 comprises a main body ring part 340 supported on the cover plate 100, an upper ring part 350 which is annularly arranged on the outer periphery of the main body ring part 340 and integrally protrudes upwards to form, and a lower ring part 360 which is annularly arranged on the inner periphery of the main body ring part 340 and integrally protrudes downwards to form, wherein the upper plastic part 300 is integrally prefabricated and formed by adopting an injection mold, and can be assembled after batch injection molding. The inner circumferential surface of the main body ring portion 340 surrounds to form a perforation 310 for the penetration of the pole 200, and the main body ring portion 340 is supported on the upper surface of the cover plate 100, so that after the pole 200 is riveted, the main body ring portion 340 can be tightly attached to the upper surface of the cover plate 100, thereby increasing the sealing performance. The upper ring portion 350 is disposed around the outer edge of the upper surface of the body ring portion 340 such that the inner circumferential surface of the upper ring portion 350 and the upper surface of the body ring portion 340 form the receiving groove 320. The lower ring portion 360 is disposed around the outer edge of the through hole 310 on the lower surface of the main body portion, and extends downward into and is accommodated in the assembly gap 600, and after the upper plastic member 300 is assembled in place, the bottom of the lower ring portion 360 can be supported on the seal ring 400 to isolate the outer peripheral surface of the post 230 from the inner peripheral surface of the post mounting hole 110. The outer circumferential surface of the lower ring portion 360 is sized to fit the inner circumferential surface of the pole mounting hole 110 such that the lower ring portion 360 can be pressed outward and the outer circumferential surface of the lower ring portion 360 can be tightly abutted against the inner circumferential surface of the pole mounting hole 110 when the pole 200 passes through the through hole 310 of the body ring portion 340 to isolate the inner space of the power battery.

It will be appreciated that in other embodiments where the receiving groove 320 is not provided, the upper plastic member may not be provided with the corresponding upper ring portion 350, so that the overall structure of the upper plastic member 300 may be simplified.

In this embodiment, the positioning and matching portion 330 is formed on the lower surface of the main body ring portion 340, and is defined as a positioning and matching ring groove 331 formed by upwardly recessing the lower surface of the main body ring portion 340, the positioning and matching portion 330 is correspondingly formed below the receiving groove 320 in the vertical direction, so that when the positioning portion 120 is positioned in the positioning and matching portion 330, the receiving groove 320 can be supported above the positioning portion 120, that is, when the positioning convex ring 121 is positioned in the positioning and matching ring groove 331, the groove bottom of the positioning and matching ring groove 331 can be supported on the upper surface of the positioning convex ring 121, and because the positioning and matching ring groove 331 corresponds to the receiving groove 320 in the vertical direction, the receiving groove 320 will bear the impact force from the riveting device when the riveting device rivets the pole 200, and because of the supporting effect of the positioning convex ring 121, the strength of the upper plastic 300 at the position can be ensured, so as to prevent the upper plastic 300 from cracking.

Referring back to fig. 3, the sealing ring 400 is sleeved on the outer periphery of the pole 200, when the pole 200 is mounted in place, the upper end of the sealing ring 400 is opposite to the bottom of the upper plastic part 300, and the lower end of the sealing ring 400 abuts against the corresponding position of the cover plate 100, so that not only can the pole 200 and the cover plate 100 be isolated, but also the pole mounting hole 110 can be plugged to seal the internal space of the power battery, and the electrolyte in the power battery is prevented from leaking. Specifically, the seal ring 400 is sleeved on the outer peripheral surface of the cylinder 230 and supported on the base 220, and the seal ring 400 has a pressing ring portion 410 pressed between the lower surface of the cover plate 100 and the upper surface of the base 220, and a sealing ring portion 420 integrally extending from the upper surface of the pressing ring portion 410. When the seal ring 400 is sleeved outside the column 230, the lower surface of the holding ring portion 410 abuts against the upper surface of the base 220, the upper surface of the holding ring portion 410 abuts against the lower surface of the cover plate 100, the sealing ring portion 420 can extend into the pole mounting hole 110 from bottom to top, the outer peripheral surface of the sealing ring portion 420 abuts against the inner peripheral surface of the pole mounting hole 110 to be held between the inner peripheral surface of the pole mounting hole 110 and the outer peripheral surface of the column 230, and the top of the sealing ring portion 420 is opposite to the bottom of the upper plastic member 300, thereby realizing insulation sealing inside the power battery.

In other embodiments, the sealing ring 400 may be omitted, and the portion of the lower plastic member 500 corresponding to the pole mounting hole 110 is integrally formed to be capable of extending into the pole mounting hole 110 to isolate the pole 200 from the inner peripheral surface of the pole mounting hole 110, so that the sealing ring 400 may be simplified, thereby simplifying the assembly process.

Referring to fig. 3 and 9, the lower plastic member 500 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 500 is a plate-shaped member corresponding to the shape of the cover plate 100, a first through hole 510 for the pole 200 to pass through is provided at the position of the lower plastic member 500 corresponding to the pole mounting hole 110, and for facilitating the assembly of the seal ring 400, the aperture of the first through hole 510 is slightly larger than the aperture of the pole mounting hole 110, so as to allow the pressing ring portion 410 of the seal ring 400 to pass through.

The upper surface of the lower plastic part 500 is provided with a limit fit convex ring 520 matched and positioned with the cover plate 100, specifically, the limit fit convex ring 520 surrounds the outer edge of the first through hole 510, and the limit fit convex ring 520 is arranged corresponding to the second limit groove 130, so that when the cover plate 100 and the lower plastic part 500 are assembled, the cover plate 100 and the lower plastic part 500 can be positioned and assembled through the limit fit convex ring 520 and the second limit groove 130. It can be appreciated that in other embodiments, when the cover plate 100 is provided with a limiting convex ring, the lower plastic part 500 may be correspondingly provided with a limiting matching ring groove capable of accommodating the limiting convex ring to position the cover plate 100 and the lower plastic part 500.

The lower surface of the lower plastic member 500 is formed with a first limit groove 530 surrounding the first through hole 510, and the shape of the first limit groove 530 is adapted to the shape of the base 220, so that the base 220 can be positioned in the first limit groove 530 and the post 230 can penetrate into the pole mounting hole 110 through the first through hole 510. The shape of the first limiting groove 530 depends on the shape of the base 220, and since the shape of the base 220 in this embodiment is an elongated shape similar to the shape of the column 230, the first limiting groove 530 is also defined as an elongated groove capable of accommodating the base 220, so that the base 220 can be limited in the first limiting groove 530. Specifically, the first diameter of the first limiting groove 530 along the length direction of the cover plate 100 is different from the second diameter along the width direction of the cover plate 100, and the first diameter or the second diameter is adapted to the outer diameter of the base 220, so that the first limiting groove 530 can limit the base 220 in the direction of the adapted diameter, so as to realize the circumferential anti-rotation of the pole 200. It will be appreciated that in other embodiments, if the shape of the base 220 is square or circular, the shape of the first limiting groove 530 will be configured to correspond to the square first limiting groove 530 and the circular first limiting groove 530 of the square base 220 or the circular base 220.

In this embodiment, the power battery top cover further includes an explosion-proof assembly 700 installed in the explosion-proof installation hole 140, so as to timely release pressure inside the power battery, and prevent explosion caused by excessive internal pressure. The lower plastic member 500 is provided with a second through hole 540 at a position corresponding to the explosion-proof mounting hole 140, so as to allow the gas to overflow. The explosion-proof assembly 700 includes an explosion-proof sheet 710 disposed in the explosion-proof mounting hole 140 and a protective film 720 disposed on the upper surface of the cover plate 100 to cover the explosion-proof mounting hole 140, 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.

In this embodiment, when the size of the plastic part on the positive electrode corresponding to the positive electrode 200 is different from the size of the plastic part on the negative electrode corresponding to the negative electrode 200, the size of the positive electrode positioning matching part 330 and the size of the negative electrode positioning part 120 corresponding to the plastic part on the positive electrode are different from the size of the negative electrode positioning matching part 330 and the size of the negative electrode positioning part 120 corresponding to the plastic part on the negative electrode, so that when the positive electrode, the plastic part on the positive electrode and the plastic part on the negative electrode are assembled, whether the positive electrode or the negative electrode is determined by the sizes of the plastic part on the positive electrode and the plastic part on the negative electrode is realized, and thus the foolproof problem of the positive electrode and the negative electrode of the power battery in the assembly process is solved, and the yield is improved.

Referring to fig. 1 to 11, when the power battery top cover of the present utility model is assembled, firstly, a preformed cover plate 100, a pole 200, an upper plastic member 300, a sealing ring 400 and a lower plastic member 500 are provided, wherein the pole 200 is the non-riveted pole 200 shown in fig. 6, and an explosion-proof assembly 700 is pre-assembled on the cover plate 100; then, the pole 200 is put into riveting equipment for fixing and the sealing ring 400 is sleeved on the periphery of the column 230; next, the lower insulating member is placed on the pole 200 and positioned, the first through hole 510 on the lower plastic member 500 is sleeved outside the column 230, the base 220 of the pole 200 is positioned in the first limiting groove 530, the upper surface of the base 220 abuts against the bottom surface of the first limiting groove 530, the cover plate 100 is placed on the lower insulating member, the column 230 passes through the pole mounting hole 110 upwards, the upper surface of the pressing ring portion 410 of the sealing ring 400 abuts against the lower surface of the cover plate 100, and the plugging ring portion 420 of the sealing ring 400 enters the pole mounting hole 110 along with the column 230 and is pressed into the assembly gap 600 between the pole mounting hole 110 and the column 230; then, the upper plastic 300 is sleeved outside the column 230 and is supported on the cover plate 100 through the matching of the positioning part 120 and the positioning matching part 330, the lower ring part 360 of the upper plastic 300 extends into the assembly gap 600 and is pressed between the pole mounting hole 110 and the column 230, meanwhile, the bottom of the lower ring part 360 is propped against the upper surface of the plugging ring part 420 of the sealing ring 400, and the annular body 240 at the top of the pole 200 upwards exceeds the bottom plane of the receiving groove 320; finally, the ring body 240 is downwardly punched by using a riveting device, so that the ring body 240 is bent outwards by 90 degrees to form the riveting portion 210 to be pressed in the receiving groove 320, thereby completing the assembly of the cover plate 100, the pole 200, the upper plastic piece 300, the sealing ring 400 and the lower plastic piece 500.

As another embodiment of the present utility model, there is provided a power battery including the power battery top cover in the above embodiment.

According to the power battery top cover and the power battery, the riveting part 210 is formed at the top of the pole 200 by adopting the riveting process, so that the stretching step of a pole 200 ring on the cover plate 100 and the welding step of the pole 200 are avoided, the assembly process is simplified, and the assembly efficiency is improved; meanwhile, the upper plastic part 300 is prefabricated and formed, so that an injection molding process after assembly is omitted, the whole process assembly process is simple, high-temperature operation is not needed, deformation of the sealing ring 400 can be effectively avoided, the sealing effect is good, the structure is simple, and the practicability is high.

Claims (10)

1. The utility model provides a battery top cap location structure, is in including running through the apron that is formed with the utmost point post mounting hole and pressure equipment is in on the apron and correspond the last plastic part of utmost point post mounting hole position department, its characterized in that, the upper surface of apron corresponds the position department of utmost point post mounting hole and is formed with location portion that the bottom of going up the plastic part corresponds the position department of location portion be formed with location portion cooperation is to going up the plastic part and is fixed a position.

2. The battery top cover positioning structure according to claim 1, wherein the positioning portion is a positioning convex ring arranged around the outer edge of the pole mounting hole, and the positioning matching portion is a positioning matching annular groove formed at the bottom of the upper plastic part and in limit matching with the positioning convex ring; or alternatively

The positioning convex ring is a positioning annular groove arranged around the outer edge of the pole mounting hole, and the positioning matching part is a positioning matching convex ring which is formed at the bottom of the upper plastic part and is in limiting fit with the positioning annular groove.

3. The battery top cover positioning structure according to claim 2, wherein an outer convex surface of the positioning convex ring or an inner concave surface of the positioning annular groove is defined as a first support surface, and an inner concave surface of the positioning mating annular groove or an outer convex surface of the positioning mating convex ring is defined as a second support surface supported on the first support surface.

4. The battery top cover positioning structure according to claim 1, wherein a plurality of anti-rotation protruding points protruding to an upper plastic part are integrally formed on the cover plate, the anti-rotation protruding points are circumferentially distributed on the cover plate, anti-rotation matching grooves for correspondingly accommodating the anti-rotation protruding points are formed on the upper plastic part at positions corresponding to the anti-rotation protruding points, and the anti-rotation protruding points are matched with the anti-rotation matching grooves to realize circumferential anti-rotation of the upper plastic part; or alternatively

The cover plate is provided with a plurality of recessed anti-rotation grooves, the anti-rotation grooves are circumferentially distributed on the cover plate, the position corresponding to the anti-rotation grooves on the upper plastic part is provided with anti-rotation matching convex points which correspondingly protrude into the anti-rotation grooves, and the anti-rotation grooves and the anti-rotation matching convex points are matched to realize circumferential anti-rotation of the upper plastic part.

5. The battery top cover positioning structure according to claim 1, wherein the upper plastic member comprises a main body ring part supported on the cover plate, an upper ring part which is annularly arranged on the outer periphery of the main body ring part and integrally protrudes upwards to form, and a lower ring part which is annularly arranged on the inner periphery of the main body ring part and integrally protrudes downwards to form, the positioning matching part is formed on the lower surface of the main body ring part, and when the upper plastic member is supported on the cover plate, the lower ring part protrudes into the pole mounting hole and is matched with a pole to seal the pole mounting hole.

6. The battery top cover positioning structure according to claim 5, wherein the outer peripheral surface of the lower ring portion is sized to fit the inner peripheral surface of the pole mounting hole, a through hole through which the pole penetrates is formed in the main body ring portion, and when the pole penetrates into the through hole, the corresponding position of the pole presses the upper plastic member and the outer peripheral surface of the lower ring portion abuts against the outer peripheral surface of the pole mounting hole.

7. The battery top cover positioning structure according to claim 3, wherein the upper plastic member is further formed with a receiving groove for receiving the pole; the receiving groove is formed on the upper surface of the upper plastic part and corresponds to the position above the positioning matching part, so that the receiving groove can be supported above the positioning part.

8. A power battery top cover, characterized by comprising the battery top cover positioning structure as claimed in any one of claims 1-7, a pole arranged in the pole mounting hole, a sealing ring pressed between the pole and a cover plate and a lower plastic part.

9. The power cell top cover of claim 8, wherein the pole penetrates the pole mounting hole from the underside of the cover plate and penetrates the upper side of the cover plate, and the penetrating end of the pole is formed with a rivet portion which is turned outwards and crimped in the upper plastic part.

10. The power cell top cover according to claim 9, wherein the pole includes a base positioned on the underside of the cover plate and a column integrally formed from an upper surface of the base, the caulking portion integrally extending outwardly from an outer edge of an end of the column remote from the base; the post is limited to be long strip-shaped, the post mounting hole is limited to be a strip-shaped hole matched with the shape of the post, and the post penetrates into the post mounting hole from the lower side of the cover plate so that the riveting part can be pressed into the upper plastic part.