CN220121968U - Battery top cover and battery - Google Patents

Abstract

The utility model provides a battery top cover and a battery, and belongs to the technical field of batteries, wherein the battery top cover comprises: the cover plate is provided with a pole hole; the pole assembly is arranged in the pole hole; the injection molding piece is connected with the pole assembly and the cover plate to fix the position of the pole assembly; the injection molding device comprises a cover plate, a limiting groove and a limiting protrusion, wherein one of the limiting groove and the limiting protrusion is arranged on the cover plate, the other one of the limiting groove and the limiting protrusion is arranged on the injection molding piece, and the limiting protrusion is matched with the limiting groove. According to the battery top cover, the limiting grooves and the limiting protrusions are arranged, so that the connection between the cover plate and the injection molding piece is enhanced, the injection molding piece is strengthened and fixed in the axial direction, the fixation of the injection molding piece to the pole assembly in the axial direction is further enhanced, and the tensile strength of the pole assembly is improved.

Description

Battery top cover and battery

Technical Field

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

Background

With the development of new energy, the market demand of lithium ion batteries is increasing. At present, the battery industry commonly adopts technologies such as pole encapsulation injection molding, riveting and laser welding to manufacture a top cover of a battery. For example, in a relatively common top cover manufacturing process, a pole needs to be fixed on a cover plate through a connecting sheet welding mode, a plurality of parts for insulating and isolating the pole are assembled and welded with the cover plate, and finally, encapsulation and injection molding are performed, so that protection of the pole and the parts is realized, the top cover assembly process is complicated, the difficulty is high, and the improvement of the production efficiency of the battery is not facilitated.

Chinese patent document CN212907879U discloses a power battery top cover, including lamina tecti, utmost point post and aluminium spacer, the aluminium spacer is located the post mounting hole and overlaps the periphery of locating the post, seals admittedly between post, aluminium spacer and the post mounting hole. However, in the pole tensile strength test, the pole is axially fixed mainly by injection molding, and the tensile strength is poor.

Disclosure of Invention

Therefore, the utility model aims to overcome the defect of poor tensile strength of the battery top cover pole in the prior art, thereby providing a battery top cover and a battery.

In order to solve the above problems, the present utility model provides a battery top cover comprising: the cover plate is provided with a pole hole; the pole assembly is arranged in the pole hole; the injection molding piece is connected with the pole assembly and the cover plate to fix the position of the pole assembly; the injection molding device comprises a cover plate, a limiting groove and a limiting protrusion, wherein one of the limiting groove and the limiting protrusion is arranged on the cover plate, the other one of the limiting groove and the limiting protrusion is arranged on the injection molding piece, and the limiting protrusion is matched with the limiting groove.

Optionally, the limit groove is formed on the hole wall of the pole hole.

Optionally, the post hole includes along the thickness direction intercommunication of apron sets up first hole section and second hole section, the trompil scope of first hole section is greater than the trompil scope of second hole section, the injection molding is located in the first hole section, spacing recess set up in the lateral wall and/or the diapire department of first hole section.

Optionally, the post subassembly includes post body, seal structure and solid fixed ring, gu fixed ring with the pore wall in post hole is connected, seal structure is located the post body with gu fixed ring between, the injection molding is connected simultaneously the post body with gu fixed ring.

Optionally, the post body includes the post boss, the solid fixed ring includes base ring and tip bulge loop, the base ring with the pore wall of second hole section is connected, the post boss with the tip bulge loop corresponds the setting, the upside of post boss the post boss with between the tip bulge loop and all be provided with between the tip bulge loop with between the diapire of first hole section the injection molding.

Optionally, a first through hole is formed in the pole boss, a second through hole is formed in the end part convex ring, the first through hole and the second through hole are correspondingly formed, and the injection molding piece is simultaneously arranged in the first through hole and the second through hole.

Optionally, the sealing structure includes a first sealing portion located between the pole body and an upper surface of the fixing ring; and/or, the sealing structure further comprises a second sealing part, wherein the second sealing part is positioned between the pole body and the inner wall of the fixing ring.

Optionally, the battery top cover further comprises lower plastic, the lower plastic is attached to the lower surface of the cover plate, an avoidance hole is formed in the lower plastic, the avoidance hole is correspondingly formed in the pole hole, the battery top cover further comprises a connecting sheet, the connecting sheet is attached to the lower surface of the lower plastic, and at least one of the pole body and the connecting sheet extends into the avoidance hole so that the pole body is connected with the connecting sheet.

Optionally, the lower plastic has an extension portion, and the extension portion is located between the pole body and the fixing ring and is connected with the sealing structure, or is located between the connecting piece and the fixing ring and is higher than the sealing structure.

The utility model also provides a battery, which comprises the battery top cover.

The utility model has the following advantages:

1. according to the battery top cover, the limiting grooves and the limiting protrusions are arranged, so that the connection between the cover plate and the injection molding piece is enhanced, the injection molding piece is strengthened and fixed in the axial direction, the fixation of the injection molding piece to the pole assembly in the axial direction is further enhanced, and the tensile strength of the pole assembly is improved.

2. According to the battery top cover provided by the utility model, the limiting groove is formed in the hole wall of the pole hole, and the positions of the limiting groove and the limiting protrusion on the battery top cover are concentrated near the pole assembly, so that the occupation of the injection molding part on the mold space is reduced, and the utilization rate of the mold space is improved.

3. According to the battery top cover, the pole boss and the end convex ring are arranged, so that the injection molding piece is conveniently matched with the pole boss and the end convex ring, and the pole body and the fixing ring are fixed.

4. According to the battery top cover provided by the utility model, the injection molding piece penetrates through the first through hole and the second through hole at the same time, so that the pole body and the fixing ring are connected to form a whole through the injection molding piece, and the installation stability of the pole body is enhanced.

5. According to the battery top cover provided by the utility model, the extending part is arranged on the lower plastic body, so that the extending part is used for insulating between the connecting sheet and the fixing ring, and the integral structure of the battery top cover is simplified.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

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

fig. 2 is a schematic view showing a partially cut-away structure of a first embodiment of a battery top cover provided by an example of the present utility model;

fig. 3 is a schematic view showing a partially cut-away structure of a second embodiment of a battery top cover provided by an embodiment of the present utility model;

fig. 4 is a schematic view showing a partially cut-away structure of a third embodiment of a battery top cover provided by an embodiment of the present utility model;

fig. 5 is a schematic view showing a partially cut-away structure of a fourth embodiment of a battery top cover provided by an embodiment of the present utility model;

reference numerals illustrate:

10. a cover plate; 11. a post hole; 111. a first bore section; 112. a second bore section; 12. a limit groove; 20. a pole assembly; 21. a pole body; 211. a post boss; 2111. a first through hole; 22. a sealing structure; 221. a first sealing part; 222. a second sealing part; 23. a fixing ring; 231. a base ring; 232. an end collar; 2321. a second through hole; 30. an injection molding; 31. a limit protrusion; 40. lower plastic; 41. avoidance holes; 42. an extension; 50. and a connecting sheet.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

One embodiment of the battery top cover as shown in fig. 1 to 5 includes: cover plate 10, pole assembly 20, and injection molding 30. The cover plate 10 is provided with a pole hole 11, the pole assembly 20 is arranged in the pole hole 11, and the injection molding piece 30 is connected with the pole assembly 20 and the cover plate 10 to fix the position of the pole assembly 20. The cover plate 10 is also provided with a limit groove 12, and correspondingly, the injection molding piece 30 is provided with a limit protrusion 31, and the limit protrusion 31 is matched with the limit groove 12.

It should be noted that, when the injection molding is performed on the injection molding piece 30, the injection molding material will be filled into the limiting groove 12, so that the portion filled into the limiting groove 12 forms the limiting protrusion 31, and the limiting protrusion 31 is limited and fixed by the limiting groove 12.

Through setting up spacing recess 12 and spacing arch 31, strengthen the connection between apron 10 and the injection molding 30, strengthen fixedly to injection molding 30 along axial direction, and then strengthened the fixed of injection molding 30 to pole subassembly 20 along axial direction, improve pole subassembly 20's tensile strength.

Of course, in other alternative embodiments, the cover plate 10 may be provided with a limiting protrusion 31, and the injection molding 30 may be correspondingly formed with the limiting groove 12.

It should be noted that, the limiting grooves 12 and the limiting protrusions 31 may be provided with a plurality of limiting grooves 12 and a plurality of limiting protrusions 31 which are disposed in one-to-one correspondence.

In this embodiment, as shown in fig. 2 to 5, the limiting groove 12 is opened on the wall of the pole hole 11, and the limiting protrusion 31 is correspondingly formed on the outer wall of the injection molding member 30.

The limiting groove 12 is formed in the hole wall of the pole hole 11, the positions of the limiting groove 12 and the limiting protrusion 31 on the battery top cover are concentrated near the pole assembly 20, occupation of the injection molding piece 30 to the mold space is reduced, and the mold space utilization rate is improved.

Specifically, as shown in fig. 2 to 5, the post hole 11 includes a first hole section 111 and a second hole section 112 that are disposed in communication along the thickness direction of the cover plate 10, the opening range of the first hole section 111 is larger than the opening range of the second hole section 112, the injection molding member 30 is located in the first hole section 111, and the limit groove 12 is opened at the side wall and/or the bottom wall of the first hole section 111.

It should be noted that the post hole 11 is a countersunk hole structure, and the first hole section 111 is a countersunk hole section, so the hole wall of the first hole section 111 includes a side wall along the vertical direction and a bottom wall along the horizontal direction. As shown in fig. 2, the limiting groove 12 is formed at the bottom wall of the first hole section 111, and correspondingly, the limiting protrusion 31 is located on the bottom surface of the injection molding 30; as shown in fig. 3 and 5, the limiting groove 12 is formed at the connection between the bottom wall of the first hole section 111 and the side wall of the first hole section 111, and correspondingly, the limiting protrusion 31 is located at the connection between the bottom surface and the side surface of the injection molding 30; as shown in fig. 4, the limiting groove 12 is formed at the side wall of the first hole section 111, and correspondingly, the limiting protrusion 31 is located on the side surface of the injection molding 30.

As shown in fig. 1 to 5, the pole assembly 20 includes a pole body 21, a sealing structure 22 and a fixing ring 23, the fixing ring 23 is connected with the wall of the pole hole 11, the sealing structure 22 is located between the pole body 21 and the fixing ring 23, and the injection molding 30 simultaneously connects the pole body 21 and the fixing ring 23.

In this embodiment, the sealing structure 22 is a sealing ring.

It is worth to say that, in the process of assembling the battery top cover, the fixing ring 23 and the cover plate 10 are welded first, and then the sealing ring is installed, so that the sealing ring is prevented from being influenced by heat generated during welding, and the sealing performance of the sealing ring is effectively ensured.

In the present embodiment, as shown in fig. 1 to 5, the pole body 21 includes a pole boss 211, the fixing ring 23 includes a base ring 231 and an end convex ring 232, the base ring 231 is connected with the hole wall of the second hole section 112, the pole boss 211 is disposed corresponding to the end convex ring 232, and injection molding pieces 30 are disposed on the upper side of the pole boss 211, between the pole boss 211 and the end convex ring 232, and between the end convex ring 232 and the bottom wall of the first hole section 111.

By arranging the pole boss 211 and the end convex ring 232, the injection molding piece 30 is convenient to be matched with the pole boss 211 and the end convex ring 232, so that the pole body 21 and the fixing ring 23 are fixed.

It should be noted that, the fixing ring 23 is welded and fixed with the hole wall of the pole hole 11, and then the injection molding piece 30 is used to connect the pole body 21 with the fixing ring 23, so that the installation and fixation of the pole body 21 can be realized, and the connection strength between the injection molding piece 30 and the cover plate 10 is enhanced through the limit protrusion 31 and the limit groove 12 which are matched, so that the secondary fixation of the pole body 21 is realized.

In this embodiment, as shown in fig. 1 to 5, a first through hole 2111 is formed in the pole boss 211, a second through hole 2321 is formed in the end collar 232, the first through hole 2111 and the second through hole 2321 are correspondingly disposed, and the injection molding member 30 is simultaneously disposed in the first through hole 2111 and the second through hole 2321.

It should be noted that, the first through holes 2111 may be formed in a plurality along the circumferential direction of the pole boss 211 at intervals, the second through holes 2321 may be formed in a plurality along the circumferential direction of the end convex ring 232 at intervals, the plurality of first through holes 2111 and the plurality of second through holes 2321 are arranged in a one-to-one correspondence, further, the plurality of first through holes 2111 are uniformly arranged at intervals, and the plurality of second through holes 2321 are also uniformly arranged at intervals, so that the uniformity of force application and fixation of the injection molding piece 30 on the pole body 21 and the fixing ring 23 is ensured.

The injection molding 30 simultaneously penetrates through the first through hole 2111 and the second through hole 2321, so that the pole body 21 and the fixing ring 23 are connected to form a whole through the injection molding 30, and the installation stability of the pole body 21 is enhanced.

It should be noted that, referring to fig. 2 to 4, the outer periphery of the sealing structure 22 is located inside the first through hole 2111 and the second through hole 2321, so as to avoid blocking the communication between the first through hole 2111 and the second through hole 2321 by the sealing structure 22, and ensure that the injection molding 30 smoothly penetrates through the first through hole 2111 and the second through hole 2321.

It should be further noted that, the outer periphery of the sealing structure 22 may also extend to form the first through hole 2111 and the second through hole 2321, and only a third through hole needs to be formed in the sealing structure 22, so that the first through hole 2111, the second through hole 2321 and the third through hole are all correspondingly formed.

As shown in fig. 1 to 5, the battery top cover further includes a lower plastic 40, the lower plastic 40 is attached to the lower surface of the cover plate 10, and the lower plastic 40 is provided with an avoidance hole 41, and the avoidance hole 41 is disposed corresponding to the pole hole 11.

It should be noted that the lower plastic 40 is an insulating structure.

As shown in fig. 1 to 5, the battery top cover further includes a connecting piece 50, and the connecting piece 50 is attached to the lower surface of the lower plastic 40.

As shown in fig. 2 to 4, the lower end of the pole body 21 extends into the relief hole 41 to be connected with the convex portion of the connection piece 50 located therebelow. As shown in fig. 5, the convex portion of the connection piece 50 extends into the relief hole 41 to be connected with the lower end of the pole body 21 located above.

Of course, both the lower end of the pole body 21 and the convex portion of the connection piece 50 may extend into the relief hole 41 for connection.

As shown in fig. 5, the sealing structure 22 includes a first sealing portion 221, and the first sealing portion 221 is located between the pole body 21 and the upper surface of the fixing ring 23. The lower plastic 40 has an extension 42, the extension 42 is located between the connecting piece 50 and the fixing ring 23, and an upper end of the extension 42 is disposed higher than the sealing structure 22.

As shown in fig. 2 to 4, the sealing structure 22 includes a first sealing portion 221 and a second sealing portion 222, the first sealing portion 221 being located between the upper surfaces of the pole body 21 and the fixing ring 23, and the second sealing portion 222 being located between the pole body 21 and the inner wall of the fixing ring 23. The lower plastic 40 has an extension portion 42, the extension portion 42 is located between the pole body 21 and the fixing ring 23, and an upper end of the extension portion 42 is connected to a lower end of the second sealing portion 222.

It is worth noting that the compression amount of the sealing ring should meet the sealing performance requirement after the assembly of the battery top cover is completed.

By providing the extension 42 on the lower plastic 40 to insulate the connection piece 50 from the fixing ring 23 by the extension 42, the overall structure of the battery top cover is simplified.

In this embodiment, as shown in fig. 1, the battery top cover further includes an explosion-proof valve.

It should be noted that two post holes 11 are formed in each cover plate 10, wherein one post hole 11 is used for installing a positive post assembly, and the other post hole 11 is used for installing a negative post assembly. The injection molding 30 for fixing the positive pole component is conductive upper plastic, and the injection molding 30 for fixing the negative pole component is insulating upper plastic. Further, the resistivity of the conductive upper plastic is 1-10000 omega.

It should be further noted that, the connection piece 50 connected to the positive electrode post body is an aluminum connection piece, and the connection piece 50 connected to the negative electrode post body is a copper connection piece.

The embodiment also provides a specific implementation mode of the battery, which comprises the battery top cover, and the battery top cover, the battery core and the shell are assembled to form the battery.

In assembling the battery top cover of the present embodiment, first, the base ring 231 of the fixing ring 23 is connected with the hole wall of the second hole section 112 of the pole hole 11; then, the sealing structure 22 and the post body 21 are mounted; then, injection molding is carried out to form an injection molding piece 30, so that the injection molding piece 30 is used for fixedly sealing the pole body 21, the sealing structure 22 and the fixing ring 23; finally, the lower plastic 40 and the connecting piece 50 are assembled.

According to the above description, the present patent application has the following advantages:

1. through the arrangement of the limiting grooves and the limiting protrusions, the connection between the cover plate and the injection molding piece is enhanced, the fixation of the injection molding piece to the pole assembly along the axial direction is further enhanced, and the tensile strength of the pole assembly is improved;

2. firstly, the fixing ring is welded, and then the sealing ring is installed, so that the sealing ring is prevented from being influenced by welding heat, and the sealing performance of the sealing ring is effectively ensured;

3. an extension is provided on the lower plastic to insulate between the connection piece and the fixing ring by the extension.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (10)

1. A battery top cover, comprising:

the device comprises a cover plate (10), wherein a pole hole (11) is formed in the cover plate (10);

a pole assembly (20) disposed within the pole bore (11);

an injection molding (30) connecting the pole assembly (20) and the cover plate (10) to fix the position of the pole assembly (20);

spacing recess (12) and spacing arch (31), spacing recess (12) with one of spacing arch (31) set up in on apron (10), spacing recess (12) with another of spacing arch (31) set up in on injection molding (30), spacing arch (31) with spacing recess (12) looks adaptation.

2. The battery top cover according to claim 1, characterized in that the limit groove (12) is opened on the hole wall of the pole hole (11).

3. The battery top cover according to claim 2, wherein the pole hole (11) comprises a first hole section (111) and a second hole section (112) which are communicated and arranged along the thickness direction of the cover plate (10), the opening range of the first hole section (111) is larger than that of the second hole section (112), the injection molding piece (30) is positioned in the first hole section (111), and the limit groove (12) is formed at the side wall and/or the bottom wall of the first hole section (111).

4. A battery top cover according to claim 3, characterized in that the pole assembly (20) comprises a pole body (21), a sealing structure (22) and a fixing ring (23), the fixing ring (23) is connected with the hole wall of the pole hole (11), the sealing structure (22) is located between the pole body (21) and the fixing ring (23), and the injection molding piece (30) is simultaneously connected with the pole body (21) and the fixing ring (23).

5. The battery top cover according to claim 4, wherein the post body (21) comprises a post boss (211), the fixing ring (23) comprises a base ring (231) and an end convex ring (232), the base ring (231) is connected with the hole wall of the second hole section (112), the post boss (211) is correspondingly arranged with the end convex ring (232), and the injection molding piece (30) is arranged on the upper side of the post boss (211), between the post boss (211) and the end convex ring (232) and between the end convex ring (232) and the bottom wall of the first hole section (111).

6. The battery top cover according to claim 5, wherein a first through hole (2111) is formed in the post boss (211), a second through hole (2321) is formed in the end part convex ring (232), the first through hole (2111) and the second through hole (2321) are correspondingly arranged, and the injection molding piece (30) is simultaneously arranged in the first through hole (2111) and the second through hole (2321).

7. The battery top cover according to any one of claims 4 to 6, wherein the sealing structure (22) includes a first sealing portion (221), the first sealing portion (221) being located between the post body (21) and an upper surface of the fixing ring (23); and/or the number of the groups of groups,

the sealing structure (22) further comprises a second sealing part (222), and the second sealing part (222) is positioned between the pole body (21) and the inner wall of the fixing ring (23).

8. The battery top cover according to any one of claims 4-6, further comprising a lower plastic (40), wherein the lower plastic (40) is attached to the lower surface of the cover plate (10), a hole (41) is formed in the lower plastic (40), the hole (41) is correspondingly formed in the post hole (11), the battery top cover further comprises a connecting sheet (50), the connecting sheet (50) is attached to the lower surface of the lower plastic (40), and at least one of the post body (21) and the connecting sheet (50) extends into the hole (41) to connect the post body (21) and the connecting sheet (50).

9. The battery top cover according to claim 8, characterized in that the lower plastic (40) has an extension (42), the extension (42) being located between the post body (21) and the fixing ring (23) and being arranged in contact with the sealing structure (22) or being located between the connecting piece (50) and the fixing ring (23) and being arranged higher than the sealing structure (22).

10. A battery comprising the battery top cover of any one of claims 1-9.