CN221080166U - Cover plate assembly and battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a battery cell. The cover plate component comprises a top cover, and is provided with a through hole; the pole is assembled in the through hole, the side wall of the pole is provided with a protruding limiting part, and the limiting part comprises a first limiting part and a second limiting part which are positioned at two sides of the top cover; the limiting part is provided with at least one concave breaking groove; the plastic assembly comprises an upper plastic and a lower plastic, wherein the upper plastic is arranged between the first limiting part and the top cover, the lower plastic is arranged between the second limiting part and the top cover, and a positioning part capable of extending into the breaking groove is formed on the plastic assembly. According to the cover plate assembly, the breaking grooves are formed in the limiting parts of the polar posts, and the positioning parts on the plastic assembly are matched with the breaking grooves, so that the purpose of stopping rotation of the polar posts is achieved, the situation that the plastic assembly and the sealing rings are damaged due to rotation of the polar posts is avoided, the safety of the battery cell is improved, and good usability of the battery cell is guaranteed.

Description

Cover plate assembly and battery cell

Technical Field

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

Background

The traditional battery cell cover plate adopts a pole and riveting block riveting structure, because the riveting block needs to be subjected to laser welding with a module busbar, a pole base needs to be subjected to laser welding with a connecting sheet of a battery cell, and the riveting block and the pole all need to be welded with a certain thickness, so that the whole height of the battery cell cover plate can be higher, the occupied space is larger, the energy density of the battery cell is influenced, and the weight and the cost of the cover plate are higher.

In the prior art, the riveting block is canceled, and the cover plate part and the assembly process are reduced in an extrusion molding mode, so that the purposes of reducing the cost and the like are achieved, but the laser welding process is omitted, the pole is not fixed relative to other parts of the battery cell cover plate, and the pole rotates to easily damage the parts such as an insulating part or a sealing ring and the like, so that the safety and the service performance of the battery cell are affected.

Disclosure of utility model

Therefore, the present application is directed to a cover assembly and a battery cell, so as to solve the problem that other components in the battery cell cover are damaged easily due to the rotation of a pole in the existing battery cell cover structure without rivet connection blocks, and the safety and the usability of the battery cell are affected.

The first aspect of the present utility model provides a cover plate assembly, wherein the cover plate assembly comprises:

A top cover provided with a through hole;

The pole is assembled in the through hole, a protruding limiting part is formed on the side wall of the pole, and the limiting part comprises a first limiting part and a second limiting part which are positioned on two sides of the top cover; the limiting part is provided with at least one concave breaking groove;

The plastic component comprises an upper plastic and a lower plastic, wherein the upper plastic is arranged between the first limiting part and the top cover, the lower plastic is arranged between the second limiting part and the top cover, and a positioning part capable of extending into the breaking groove is formed on the plastic component.

Preferably, the upper plastic is annular and is sleeved on the periphery of the pole; the inner wall of the upper plastic is formed into a step structure, so that the upper plastic is attached to the bottom wall of the first limiting part and at least part of the side wall of the first limiting part;

The positioning part is arranged on the step structure, and the first limiting part is provided with a breaking groove into which the positioning part extends.

Preferably, the limit part is formed in an annular structure surrounding the periphery of the pole, and the limit part provided with the breaking groove is formed in an annular structure with at least one opening.

Preferably, the positioning part is formed into a convex block structure, and the fracture groove is in profiling fit with the positioning part, so that the positioning part is attached to the groove wall of the fracture groove.

Preferably, the breaking grooves are arranged in a plurality, the breaking grooves are arranged at intervals around the circumference of the limiting part, and the positioning parts are arranged in one-to-one correspondence with the breaking grooves.

Preferably, a plurality of the breaking grooves are arranged at equal intervals along the circumferential direction of the limiting part, and/or a plurality of the breaking grooves are symmetrically arranged.

Preferably, the pole comprises a pole body, and the first limiting part and the second limiting part arranged at two ends of the pole body, and the breaking groove extends from the outer edge of the limiting part to the side wall of the pole body.

Preferably, the outer edge dimension of the limiting part is larger than the inner wall dimension of the through hole.

Preferably, the cover plate assembly further comprises:

And the sealing piece is arranged between the top cover and the second limiting part and/or between the outer wall of the pole and the inner wall of the through hole.

The second aspect of the utility model provides a battery cell, which comprises the cover plate assembly according to any one of the above technical schemes.

Compared with the prior art, the utility model has the beneficial effects that:

According to the cover plate assembly, the breaking grooves are formed in the limiting parts of the polar posts, and the positioning parts on the plastic assembly are matched with the breaking grooves, so that the purpose of stopping rotation of the polar posts is achieved, the situation that the plastic assembly and the sealing rings are damaged due to rotation of the polar posts is avoided, the safety of the battery cell is improved, and good usability of the battery cell is guaranteed.

In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

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 diagram of a cover assembly according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a cover plate assembly according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of a cover plate assembly according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a pole in a cover assembly according to an embodiment of the present utility model;

Fig. 5 is a schematic structural diagram of an upper plastic in a cover assembly according to an embodiment of the present utility model.

Icon: 10-pole; 11-a pole body; 12-a first limit part; 13-a second limit part; 14-breaking grooves; 20-top cover; 21-a through hole; 31-plastic feeding; 311-step structure; 32-lower plastic; 33-positioning part; 40-seal.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but rather, obvious variations may be made upon an understanding of the present disclosure, other than operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided solely to illustrate some of the many possible ways of implementing the methods, devices, and/or systems described herein that will be apparent after understanding the present disclosure.

In the entire specification, when an element (such as a layer, region or substrate) is described as being "on", "connected to", "bonded to", "over" or "covering" another element, it may be directly "on", "connected to", "bonded to", "over" or "covering" another element or there may be one or more other elements interposed therebetween. In contrast, when an element is referred to as being "directly on," directly connected to, "or" directly coupled to, "another element, directly on," or "directly covering" the other element, there may be no other element intervening therebetween.

As used herein, the term "and/or" includes any one of the listed items of interest and any combination of any two or more.

Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, component, region, layer or section discussed in examples described herein could also be termed a second member, component, region, layer or section without departing from the teachings of the examples.

For ease of description, spatially relative terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to another element would then be oriented "below" or "lower" relative to the other element. Thus, the term "above … …" includes both orientations "above … …" and "below … …" depending on the spatial orientation of the device. The device may also be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Singular forms also are intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" are intended to specify the presence of stated features, integers, operations, elements, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, and/or groups thereof.

Variations from the shapes of the illustrations as a result, of manufacturing techniques and/or tolerances, are to be expected. Accordingly, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shapes that occur during manufacture.

The features of the examples described herein may be combined in various ways that will be apparent upon an understanding of the present disclosure. Further, while the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the present disclosure.

According to a first aspect of the present utility model, a cover plate assembly is provided, which includes a top cover 20, a pole 10, and a plastic assembly.

Hereinafter, a specific structure of the above-described components of the cap plate assembly according to the present embodiment will be described.

In this embodiment, as shown in fig. 1 to 3, the top cover 20 is formed into a long plate-shaped structure, the top cover 20 is provided with a through hole 21, the pole 10 is assembled to the through hole 21, the side wall of the pole 10 is formed with a protruding limit part, and the limit part comprises a first limit part 12 and a second limit part 13 positioned at two sides of the top cover 20 along the axial direction of the through hole 21; the plastic subassembly includes plastic 31 and lower plastic 32, wherein, go up plastic 31 setting between first spacing portion 12 and top cap 20, lower plastic 32 sets up between second spacing portion 13 and top cap 20, plastic subassembly and utmost point post 10 crimping are connected, cancel the riveting piece so, avoid there is the risk that drops between riveting piece and the utmost point post 10, also reduced the height of utmost point post 10 simultaneously, practiced thrift the cost of manufacture and the weight of apron subassembly, promoted the energy density of electric core.

Further, in the present embodiment, the pole 10 includes a pole body 11, and first and second stopper portions 12 and 13 provided at both ends of the pole body 11 as shown in fig. 1 to 4. In this embodiment, as shown in fig. 3, the outer edge dimension of the limiting portion is larger than the inner wall dimension of the through hole 21, so that the plastic component, the top cover 20 and the seal member 40 described below are all assembled on the pole body 11 and pressed between the first limiting portion 12 and the second limiting portion 13, thereby ensuring reliable crimping of the cover plate component without the rivet block.

Specifically, the top of the lower plastic 32 is attached to the bottom of the top cover 20, the top of the second limiting portion 13 is attached to the bottom of the lower plastic 32 to press the lower plastic 32 toward the top cover 20, the bottom of the upper plastic 31 is attached to the top of the top cover 20, and a portion of the upper plastic 31 extends between the inner wall of the through hole 21 and the outer wall of the pole body 11.

In addition, in the present embodiment, the top of the first limiting portion 12 is coplanar with the top of the pole 10, and the bottom of the second limiting portion 13 is coplanar with the bottom of the pole 10, so that the first limiting portion 12 and the second limiting portion 13 are located at two axial ends of the pole 10, thereby reducing the size of the pole 10 while ensuring the performance of the pole 10, reducing the weight and cost of the cover plate assembly, and improving the energy density of the battery cell.

In this embodiment, as shown in fig. 1 to 5, at least one recessed breaking groove 14 is provided on the limiting portion, and a positioning portion 33 capable of extending into the breaking groove 14 is formed on the plastic component to form a rotation stopping structure, so that after the plastic component is assembled with the pole 10, the positioning portion 33 extending into the breaking groove 14 can effectively prevent the pole 10 from rotating, thus avoiding damage to the plastic component or the sealing member 40 described below caused by the pole 10, and further ensuring the usability of the cover plate component.

In the preferred embodiment, the breaking groove 14 extends from the outer edge of the limiting portion to the side wall of the pole body 11, so that the breaking groove 14 has a sufficient depth and does not damage the structure of the pole body 11, and the performance and the rotation stopping reliability of the pole 10 are ensured.

Further, in the present embodiment, as shown in fig. 1 to 5, the upper plastic 31 is ring-shaped to be sleeved on the outer periphery of the pole 10; the inner wall of the upper plastic 31 is formed into a step structure 311, so that the upper plastic 31 is attached to the bottom wall of the first limiting portion 12 and at least part of the side wall, so as to ensure that the upper plastic 31 is firmly pressed with the pole 10. The top of the upper plastic 31 is lower than the top of the pole 10 to ensure the usability of the pole 10.

In this embodiment, as shown in fig. 5, the positioning portion 33 is disposed on the step structure 311, specifically, the positioning portion 33 protrudes from the top of the step structure 311 toward the first limiting portion 12, and the first limiting portion 12 is formed with a breaking groove 14 into which the positioning portion 33 extends, so that a rotation stopping structure in which the positioning portion 33 and the breaking groove 14 are engaged is disposed above the top cover 20, thereby facilitating assembly and ensuring reliable assembly.

However, in another alternative embodiment, the breaking groove 14 may be provided on the second limiting portion 13, and the positioning portion 33 is provided on the lower plastic 32, so that the rotation stop of the pole 10 can be achieved as well; in an alternative embodiment, the first limiting portion 12 and the second limiting portion 13 are respectively provided with a breaking groove 14, and the upper plastic 31 and the lower plastic 32 are respectively provided with a positioning portion 33, so that the reliability of the rotation stopping of the pole 10 can be improved.

Further, in the present embodiment, the limiting portion is formed as an annular structure surrounding the outer periphery of the pole 10, wherein the limiting portion provided with the breaking grooves 14 is formed as an annular structure having at least one opening, as shown in fig. 4, the first limiting portion 12 is provided with a plurality of breaking grooves 14 such that the annular structure of the first limiting portion 12 is discontinuous, and the second limiting portion 13 is not provided with breaking grooves 14 such that the second limiting portion 13 is a closed annular structure.

It should be noted that, the limit portion of the annular structure is adapted to the shape of the pole 10, for example, when the cross section of the pole 10 is circular, the limit portion is a circular ring, for example, when the cross street of the pole 10 is square, the limit portion is a square ring.

Furthermore, in the present embodiment, the positioning portion 33 is formed into a convex structure, such as a cube structure, and the breaking groove 14 is adapted to the positioning portion 33 in a profiling manner, so that the positioning portion 33 is attached to the wall of the breaking groove 14, thereby ensuring the reliable rotation stopping of the pole 10 and avoiding the shaking or loosening of the pole 10 in the cover assembly.

In addition, in the present embodiment, as shown in fig. 4, a plurality of, for example, four breaking grooves 14 are provided, and a plurality of breaking grooves 14 are arranged at intervals around the circumference of the limiting portion, and the positioning portions 33 are arranged in one-to-one correspondence with the breaking grooves 14, so that the reliability of the rotation stopping of the pole 10 is improved.

Further, in this embodiment, as shown in fig. 4, the plurality of breaking grooves 14 are arranged at equal intervals along the circumferential direction of the limiting portion and/or the plurality of breaking grooves 14 are symmetrically arranged, so as to ensure that the pole 10 is stressed uniformly, avoid the situation that the positioning portion 33 of the pole 10 is severely worn, and further ensure the reliability of the rotation stopping of the pole 10 and the service life of the cover plate assembly. When the plurality of break grooves 14 are symmetrically arranged, the number of break grooves 14 is an even number, and the plurality of break grooves 14 may be mirror-symmetrically arranged with respect to the length direction of the cover plate.

In addition, in this embodiment, as shown in fig. 2 and 3, the cover plate assembly further includes a sealing member 40, where the sealing member 40 is a sealing ring, and the sealing member 40 is disposed between the top cover 20 and the second limiting portion 13 and/or between the outer wall of the pole 10 and the inner wall of the through hole 21, so as to fill gaps between the pole 10 and the top cover 20 and between the pole and the plastic assembly, so that the inside and the outside of the battery cell are isolated, and leakage or damage caused by external moisture, dust and the like is avoided, thereby ensuring normal operation of the battery cell and prolonging the service life of the battery cell. Specifically, in the present embodiment, the outer wall of the seal member 40 is provided with a boss such that a part of the seal member 40 is sandwiched between the second stopper 13 and the top cover 20, and a part of the seal member 40 is provided between the outer wall of the pole body 11 and the inner wall of the through hole 21 to achieve reliable sealing.

In addition, in the present embodiment, the top of the top cover 20 is provided with an upwardly protruding protrusion, and the bottom of the upper plastic 31 is formed with a groove into which the protrusion protrudes, so that the position between the upper plastic 31 and the top cover 20 is fixed, and the protrusion and the groove may be formed in a ring structure.

According to the cover plate assembly provided by the utility model, parts of riveting blocks are omitted, laser welding is not needed, the height of the pole is reduced, and the weight and cost of the cover plate assembly are reduced; the pole is of an integral structure, so that the problem of overlarge internal resistance is solved; through set up the broken groove on the spacing portion of utmost point post to make the locating part on the plastic subassembly cooperate with the broken groove, reach the purpose that the utmost point post was splines, avoid so because of the circumstances that the post rotated and caused plastic subassembly and sealing washer to damage, thereby satisfy the user demand of apron subassembly.

According to the battery cell provided by the second aspect of the utility model, the cover plate assembly provided by the embodiment is included, so that the height of the pole is reduced to save the occupied space, and the energy density of the battery cell is improved; the purpose of stopping rotation of the pole is achieved through the cooperation of the breaking groove and the positioning part, the safety of the battery cell is effectively improved, and good usability of the battery cell is guaranteed.

Finally, it should be noted that: the above examples are only specific embodiments of the present application, and are not intended to limit the scope of the present application, but it should be understood by those skilled in the art that the present application is not limited thereto, and that the present application is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A cover plate assembly, the cover plate assembly comprising:

A top cover provided with a through hole;

The pole is assembled in the through hole, a protruding limiting part is formed on the side wall of the pole, and the limiting part comprises a first limiting part and a second limiting part which are positioned on two sides of the top cover; the limiting part is provided with at least one concave breaking groove;

The plastic component comprises an upper plastic and a lower plastic, wherein the upper plastic is arranged between the first limiting part and the top cover, the lower plastic is arranged between the second limiting part and the top cover, and a positioning part capable of extending into the breaking groove is formed on the plastic component.

2. The cover plate assembly according to claim 1, wherein the upper plastic is ring-shaped to be sleeved on the outer periphery of the pole; the inner wall of the upper plastic is formed into a step structure, so that the upper plastic is attached to the bottom wall of the first limiting part and at least part of the side wall of the first limiting part;

The positioning part is arranged on the step structure, and the first limiting part is provided with a breaking groove into which the positioning part extends.

3. The cover plate assembly according to claim 1, wherein the limit portion is formed in an annular structure surrounding the outer periphery of the pole, and the limit portion provided with the break groove is formed in an annular structure having at least one opening.

4. The cover plate assembly according to claim 1, wherein the positioning portion is formed in a convex block structure, and the breaking groove is in profiling fit with the positioning portion, so that the positioning portion is attached to a groove wall of the breaking groove.

5. The cover plate assembly according to claim 1, wherein a plurality of breaking grooves are provided, the breaking grooves are arranged at intervals around the circumference of the limiting portion, and the positioning portions are arranged in one-to-one correspondence with the breaking grooves.

6. The cover plate assembly according to claim 5, wherein a plurality of the break grooves are provided at equal intervals along the circumferential direction of the limit portion, and/or a plurality of the break grooves are provided symmetrically.

7. The cover plate assembly of claim 1, wherein the pole includes a pole body, and the first and second limiting portions are disposed at both ends of the pole body, and the breaking groove extends from an outer edge of the limiting portion to a sidewall of the pole body.

8. The cover plate assembly of claim 1, wherein an outer edge dimension of the limiting portion is greater than an inner wall dimension of the through hole.

9. The cover plate assembly of claim 1, further comprising:

And the sealing piece is arranged between the top cover and the second limiting part and/or between the outer wall of the pole and the inner wall of the through hole.

10. A cell comprising a cap assembly according to any one of claims 1 to 9.