CN219457810U - Secondary battery and electric equipment - Google Patents

Abstract

The utility model belongs to the technical field of batteries, and in particular relates to a secondary battery and electric equipment, which comprises the following components: an electrode assembly; a housing for accommodating the electrode assembly, wherein at least one end of the housing is provided with an opening, and a flanging part which is bent inwards is formed at the opening; the cover plate is positioned at the opening, an annular clamping groove is formed in the side wall of the cover plate, and the annular clamping groove is meshed with the flanging part to close the opening. The annular clamping groove and the flanging part form a riveting structure, so that the cover plate is prevented from being broken during riveting, the effectiveness of riveting is ensured, the design of the riveting cover plate can avoid sealing failure caused by deformation of the cover plate due to the sealing process in the assembly process of the electrode assembly, and adverse effects on the strength of the cover plate explosion-proof valve due to the sealing process are avoided.

Description

Secondary battery and electric equipment

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a secondary battery and electric equipment.

Background

In the assembly process of the cylindrical electrode assembly, the sealing is the last procedure, and the existing sealing procedure is as follows: firstly, forming a boss on the surface of a steel shell through a rolling groove process, then placing a cover plate and a sealing rubber ring on the boss, bending the steel shell through downward action of a press machine, and compacting the cover plate and the sealing rubber ring, wherein the process comprises a first sealing process, a second sealing process, a third sealing process and a pier sealing process, so that a complete cylindrical electrode assembly can be formed, and the manufacturing process is complicated. In the sealing process of the current cylindrical electrode assembly, the downward action of the press promotes the steel shell to deform and compress the sealing rubber ring, so that the cover plate is warped and deformed, sealing failure is caused, meanwhile, the strength of the cover plate explosion-proof valve is also influenced, and the explosion-proof valve is opened in advance.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a secondary battery and an electric device, which can simplify a battery sealing process, prevent deformation of a cover plate, and improve sealing quality.

To achieve the above and other related objects, the present utility model provides a secondary battery comprising:

an electrode assembly;

a housing for accommodating the electrode assembly, wherein at least one end of the housing is provided with an opening, and a flanging part which is bent inwards is formed at the opening;

the cover plate is positioned at the opening, an annular clamping groove is formed in the side wall of the cover plate, and the annular clamping groove is meshed with the flanging part to close the opening.

In an alternative embodiment of the present utility model, the annular clamping groove comprises an annular groove bottom and two side groove walls respectively arranged at the upper side and the lower side of the groove bottom, wherein at least one side groove wall is configured to be capable of generating plastic deformation.

In an alternative embodiment of the present utility model, a sealing ring is disposed between the annular clamping groove and the flanging portion, and the sealing ring is located between the flanging portion and at least one side groove wall of the annular clamping groove.

In an optional embodiment of the present utility model, at least one side groove wall of the annular clamping groove is provided with a plurality of notch portions, and each notch portion is disposed at intervals along a circumferential direction of the cover plate.

In an alternative embodiment of the utility model, the width of the cuff is less than 1/6 of the shell radius and greater than 1/10 of the shell radius.

In an alternative embodiment of the present utility model, the width of the overlapping area between the groove walls at both sides of the annular clamping groove and the flanging part is greater than 1/5 of the width of the flanging part.

In an alternative embodiment of the present utility model, the burring and the annular clamping groove are configured to be able to disengage the burring from the annular clamping groove to release the pressure in the secondary battery when the pressure in the secondary battery is greater than a preset value.

In an alternative embodiment of the present utility model, the cap plate is provided with a weak portion configured to be ruptured to release the pressure in the secondary battery when the pressure in the secondary battery is greater than a preset value.

In an alternative embodiment of the present utility model, a switching piece is disposed between the cover plate and the electrode assembly, and the tab of the electrode assembly is electrically connected to the cover plate or the case through the switching piece.

To achieve the above object and other related objects, the present utility model also provides an electric device, including the secondary battery.

To achieve the above object and other related objects, the present utility model also provides an electric device including the secondary battery.

The utility model has the technical effects that: the annular clamping groove and the flanging part form a riveting structure, when the internal pressure of the electrode assembly is increased, material damage failure occurs at the riveting part, the cover plate is opened, the purpose of pressure relief is realized, meanwhile, the notch part is arranged on the side wall of the annular clamping groove, the cover plate is prevented from being broken during riveting, the effectiveness of riveting is ensured, the design of the riveting cover plate can avoid sealing failure caused by deformation of the cover plate due to the sealing process in the assembly process of the electrode assembly, and adverse effect on the strength of the cover plate explosion-proof valve due to the sealing process is avoided.

Drawings

Fig. 1 is a perspective view of a secondary battery provided by an embodiment of the present utility model;

fig. 2 is an end view of a secondary battery provided by an embodiment of the present utility model;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is an enlarged partial view of I of FIG. 3;

fig. 5 is an exploded view of a secondary battery provided by an embodiment of the present utility model;

FIG. 6 is a partial perspective view of an open end of a housing provided by an embodiment of the present utility model;

FIG. 7 is a perspective view of a cover plate provided by an embodiment of the present utility model;

FIG. 8 is a schematic diagram of a cover plate installation provided by one embodiment of the present utility model;

FIG. 9 is a schematic diagram of a cover plate installation provided by another embodiment of the present utility model;

reference numerals: 10. an electrode assembly; 20. a housing; 21. a burring part; 30. a cover plate; 31. an annular clamping groove; 310. groove bottom, 32, side groove wall; 33. a notch portion; 40. a negative electrode switching sheet; 50. a positive electrode switching piece; 60. a seal ring; 70. a pole.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the illustrations, not according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.

The secondary battery of the present utility model is especially a cylindrical battery, which comprises a cylindrical casing 20 and an electrode assembly 10 accommodated in the casing 20, when the battery is assembled, an opening is reserved at least one end of the casing 20, then the electrode assembly 10 is put into the casing 20 from the opening, and finally the opening is plugged by a cover plate 30, and the prior art generally adopts the processes of rolling groove, spinning, upsetting, etc. to seal, and the specific process is as follows: firstly, a circle of ring grooves are rolled out on the side wall of the shell 20 at the position close to the opening, then the cover plate 30 is placed on a step formed by the ring grooves, the edge of the opening is gradually folded and pressed tightly by multiple times of spinning, and finally, the end face of the battery is subjected to upsetting, so that the end part of the battery is more tightly pressed. The sealing structure needs to be subjected to multiple spinning operations, the preparation process is complex, the production efficiency is low, and when the pressing machine acts downwards to cause deformation of the steel shell to press the sealing rubber ring, the cover plate 30 can warp and deform to cause sealing failure, meanwhile, the strength of the explosion-proof valve of the cover plate 30 can be influenced, and the explosion-proof valve can be opened in advance.

Referring to fig. 1 to 9, the secondary battery provided by the present utility model includes an electrode assembly 10, a case 20 and a cap plate 30, it should be understood that the present utility model only describes the structure of an improved portion of the secondary battery in detail, and actually the secondary battery should further include necessary structural features such as a positive electrode tab 50, a negative electrode tab 40 and a post 70, which are not essential to the present utility model, so that the connection between the cap plate 30 and the case 20 provided by the present utility model may be applied to the negative electrode of the secondary battery or the positive electrode of the secondary battery, and preferably, the cap plate 30 in the following embodiments is mounted on the negative electrode of the secondary battery, and the negative electrode tab of the electrode assembly 10 may be electrically connected to the cap plate 30 or the case 20, depending on the specific confluence manner of the secondary battery after the battery is assembled.

Referring to fig. 3, in a specific embodiment, the electrode assembly 10 may be, for example, a winding core, that is, an electrode assembly formed by winding, where two ends of the electrode assembly are respectively provided with a positive electrode tab and a negative electrode tab, specifically, the electrode assembly includes a positive electrode tab, a negative electrode tab, and a separator separating the positive electrode tab from the negative electrode tab, the positive electrode tab, the separator, and the negative electrode tab are wound to form the electrode assembly, the positive electrode tab includes a coating region coated with a positive electrode active material and an end portion not coated with an active material, the negative electrode tab includes a coating region coated with a negative electrode active material and an end portion not coated with an active material, and the uncoated regions of the positive electrode and the negative electrode after winding are respectively located at two ends of the electrode assembly and serve as the positive electrode tab and the negative electrode tab of the battery.

Referring to fig. 1-6, the housing 20 is configured to accommodate the electrode assembly 10, at least one end of the housing 20 is provided with an opening, and a flange portion 21 bent inwards is formed at the opening; it should be appreciated that the housing 20 of a cylindrical battery may serve as either the positive or negative electrode of the battery, and thus in particular embodiments, the housing 20 is made of an electrically conductive material, and in order to facilitate the sealing operation, the housing 20 needs to have a certain plasticity, for example, the housing 20 may be a steel or aluminum shell; the inward bending means bending along the radial direction of the housing 20 toward the direction where the axis of the housing 20 is located, and the flange portion 21 and the side wall of the housing 20 may form an included angle of about 90 ° for example.

Referring to fig. 1-5 and 7, the cover 30 is located at the opening, an annular clamping groove 31 is formed on a side wall of the cover 30, and the annular clamping groove 31 is meshed with the flanging portion 21 to close the opening; it should be understood that the annular clamping groove 31 refers to that the connecting line of the clamping groove in the circumferential direction is annular, and does not represent that the whole clamping groove is necessarily continuous annular, the annular clamping groove 31 and the flanging part 21 form a riveting structure, when the internal pressure of the electrode assembly 10 is increased, material damage failure occurs at the riveting position, and the cover plate 30 is opened to realize the purpose of pressure relief. The design of the riveting cover plate 30 can avoid the sealing failure caused by deformation of the cover plate 30 due to the sealing process in the assembly process of the electrode assembly 10, and also avoid the adverse effect of the sealing process on the strength of the explosion-proof valve of the cover plate 30.

Referring to fig. 8 and 9, in an embodiment, the annular clamping groove 31 includes an annular groove bottom 310, and two side groove walls 32 disposed on upper and lower sides of the groove bottom 310, wherein at least one side groove wall 32 is configured to be capable of plastic deformation; the seal ring 60 is disposed between the annular clamping groove 31 and the flange portion 21, and the seal ring 60 is disposed between the flange portion 21 and at least one side groove wall 32 of the annular clamping groove 31, in a specific embodiment, the seal ring 60 may be distributed on inner and outer sides of the flange portion 21, the seal rings 60 on the inner and outer sides may be separated from each other, may be an integral structure connected to each other, and in other alternative embodiments, may be disposed on only one side of the flange portion 21.

It should be understood that the housing 20 of the cylindrical battery may have a cylindrical structure with one end opened, or may have a cylindrical structure with both ends opened; as shown in fig. 8, when the case 20 is open at one end, it is necessary to install the electrode assembly 10 in the case 20 and then rivet the cap plate 30 and the case 20, in which case only the rivet can be performed from the outside of the cap plate 30, so at least the outer groove wall 32 of the annular clamping groove 31 should be capable of plastic deformation, as follows: after the electrode assembly 10 is assembled into the case 20, the cap plate 30 and the seal ring 60 (not shown in fig. 8) before caulking are first put into the case, and at this time, the outer groove wall 32 of the annular clamping groove 31 is in a state shown by a solid line in the drawing, and the outer groove wall 32 is cantilevered outward so as to avoid the bending path of the burring part 21; then, the flanging part 21 is processed at the opening of the housing 20 by a spinning process, at this time, the inner side of the flanging part 21 is abutted against the inner side groove wall 32 of the annular clamping groove 31, and finally, the outer side groove wall 32 of the annular clamping groove 31 is bent into a state shown by a dotted line in the figure by a crimping device, at this time, the outer side groove wall 32 is abutted against the outer side of the flanging part 21, a riveting structure is formed between the cover plate 30 and the flanging part 21, and the sealing ring 60 is clamped between the annular clamping groove 31 and the flanging part 21 in the process.

As shown in fig. 9, when the case 20 is open at both ends, the cap plate 30 may be first connected to one of the openings of the case 20, then the electrode assembly 10 may be placed into the case 20, and then the other opening may be closed, in which case riveting may be performed from the inside of the cap plate 30, for example, the inner groove wall 32 of the annular clamping groove 31 may be configured to be plastically deformed, and the specific riveting process is as follows: the flange portion 21 is first machined at one opening of the housing 20, then the cover plate 30 before riveting is inserted from the outside of the opening, and meanwhile, a sealing ring 60 (not shown in fig. 9) is placed between the cover plate 30 and the flange portion 21, so that the outer side groove wall 32 of the annular clamping groove 31 is abutted against the flange portion 21, at this time, the inner side groove wall 32 of the annular clamping groove 31 is in a state as shown by a solid line in the drawing, the inner side groove wall 32 is overhanging toward the inner side of the housing 20 to avoid the flange portion 21, after the cover plate 30 is mounted in place, the inner side groove wall 32 of the annular clamping groove 31 is bent into a state as shown by a broken line in the drawing by a crimping device, at this time, the inner side groove wall 32 is abutted against the inner side of the flange portion 21, and a riveting structure is formed between the cover plate 30 and the flange portion 21, and the sealing ring 60 is clamped between the annular clamping groove 31 and the flange portion 21 in the above process.

It should be understood that in other embodiments, when the housing 20 is open at two ends, a riveting scheme shown in fig. 8 may be used to implement riveting from the outside, which is not described herein.

Referring to fig. 7, in an embodiment, at least one of the side walls 32 of the annular clamping groove 31 is provided with a plurality of notches 33, and each notch 33 is disposed at intervals along the circumferential direction of the cover plate 30, it should be understood that the notches 33 only need to be disposed on one side where riveting is performed, and the groove wall 32 on the other side may be disposed in a continuous annular structure, and the notches 33 can prevent the edge of the side wall 32 from tearing during riveting, so as to ensure the effectiveness of riveting.

In an alternative embodiment, the width of the flanging portion 21 is smaller than 1/6 of the radius of the housing 20 and larger than 1/10 of the radius of the housing 20, so as to ensure the connection reliability of the riveting area, if the width of the flanging portion 21 is larger than 1/6, the flanging portion 21 is excessively large, the flanging portion is folded, the subsequent riveting and sealing failure are caused, and if the width of the flanging portion 21 is smaller than 1/10, the riveting contact area is excessively small, the riveting strength is insufficient, and the cover plate 30 is peeled off under a relatively small internal pressure; the width of the overlapping area of the two side groove walls 32 of the annular clamping groove 31 and the flanging part 21 is greater than 1/5 of the width of the flanging part 21, so that the defects of wrinkling, warping and the like of materials in the processing process can be avoided while the structural strength is ensured.

In an alternative embodiment, the burring 21 and the annular groove 31 are configured to be able to disengage the burring 21 from the annular groove 31 to release the pressure in the secondary battery when the pressure in the secondary battery is greater than a preset value. It should be understood that in this embodiment, the cover plate 30 itself is used as the so-called explosion-proof valve of the battery, and when the internal pressure of the battery is too high, the riveting area is broken, so that the internal pressure of the battery is rapidly released; in other alternative embodiments, a dedicated explosion-proof valve may be provided on the cover plate 30, for example, an annular weak portion may be provided on the cover plate 30, the weak portion being configured to be able to rupture when the pressure in the secondary battery is greater than a preset value, so as to release the pressure in the secondary battery.

Based on the secondary battery, the utility model also provides electric equipment, and all electric equipment comprising the secondary battery belongs to the scope defined by the utility model.

In summary, the annular clamping groove 31 and the flanging part 21 form a riveting structure, when the internal pressure of the electrode assembly 10 is increased, material damage failure occurs at the riveting position, the cover plate 30 is opened, the purpose of pressure relief is achieved, meanwhile, the notch part 33 is arranged on the side wall of the annular clamping groove 31, the cover plate 30 during riveting is prevented from being broken, the effectiveness of riveting is ensured, the design of the riveting cover plate 30 can avoid sealing failure caused by deformation of the cover plate 30 due to the sealing process in the assembly process of the electrode assembly 10, and adverse effects on the strength of the explosion-proof valve of the cover plate 30 due to the sealing process are avoided.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

In the description herein, numerous specific details are provided, such as examples of components and/or methods, to provide a thorough understanding of embodiments of the utility model. One skilled in the relevant art will recognize, however, that an embodiment of the utility model can be practiced without one or more of the specific details, or with other apparatus, systems, components, methods, components, materials, parts, and so forth. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the utility model.

Reference throughout this specification to "one embodiment," "an embodiment," or "a particular embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment, and not necessarily all embodiments, of the present utility model. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the present utility model may be combined in any suitable manner with one or more other embodiments. It will be appreciated that other variations and modifications of the embodiments of the utility model described and illustrated herein are possible in light of the teachings herein and are to be considered as part of the spirit and scope of the utility model.

It will also be appreciated that one or more of the elements shown in the figures may also be implemented in a more separated or integrated manner, or even removed because of inoperability in certain circumstances or provided because it may be useful depending on the particular application.

In addition, any labeled arrows in the drawings/figures should be considered only as exemplary, and not limiting, unless otherwise specifically indicated. Furthermore, the term "or" as used herein is generally intended to mean "and/or" unless specified otherwise. Combinations of parts or steps will also be considered as being noted where terminology is foreseen as rendering the ability to separate or combine is unclear.

As used in the description herein and throughout the claims that follow, unless otherwise indicated, "a", "an", and "the" include plural references. Also, as used in the description herein and throughout the claims that follow, unless otherwise indicated, the meaning of "in …" includes "in …" and "on …".

The above description of illustrated embodiments of the utility model, including what is described in the abstract, is not intended to be exhaustive or to limit the utility model to the precise forms disclosed herein. Although specific embodiments of, and examples for, the utility model are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present utility model, as those skilled in the relevant art will recognize and appreciate. As noted, these modifications can be made to the present utility model in light of the foregoing description of illustrated embodiments of the present utility model and are to be included within the spirit and scope of the present utility model.

The systems and methods have been described herein in general terms as being helpful in understanding the details of the present utility model. Furthermore, various specific details have been set forth in order to provide a thorough understanding of embodiments of the utility model. One skilled in the relevant art will recognize, however, that an embodiment of the utility model can be practiced without one or more of the specific details, or with other apparatus, systems, assemblies, methods, components, materials, parts, and/or the like. In other instances, well-known structures, materials, and/or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the utility model.

Thus, although the utility model has been described herein with reference to particular embodiments thereof, a latitude of modification, various changes and substitutions are intended in the foregoing disclosures, and it will be appreciated that in some instances some features of the utility model will be employed without a corresponding use of other features without departing from the scope and spirit of the utility model as set forth. Therefore, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the present utility model. It is intended that the utility model not be limited to the particular terms used in following claims and/or to the particular embodiment disclosed as the best mode contemplated for carrying out this utility model, but that the utility model will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the utility model should be determined only by the following claims.

Claims (10)

1. A secondary battery, characterized by comprising:

an electrode assembly;

a housing for accommodating the electrode assembly, wherein at least one end of the housing is provided with an opening, and a flanging part which is bent inwards is formed at the opening;

the cover plate is positioned at the opening, an annular clamping groove is formed in the side wall of the cover plate, and the annular clamping groove is meshed with the flanging part to close the opening.

2. The secondary battery according to claim 1, wherein the annular clamping groove comprises an annular groove bottom, and two side groove walls disposed on upper and lower sides of the groove bottom, wherein at least one of the side groove walls is configured to be capable of plastic deformation.

3. The secondary battery according to claim 1, wherein a seal ring is provided between the annular clamping groove and the burring part, the seal ring being located between the burring part and at least one side groove wall of the annular clamping groove.

4. The secondary battery according to claim 2, wherein a plurality of notch portions are provided on at least one of the side groove walls of the annular clamping groove, each of the notch portions being disposed at intervals in a circumferential direction of the cap plate.

5. The secondary battery according to claim 1, wherein the width of the burring is less than 1/6 of the radius of the can and greater than 1/10 of the radius of the can.

6. The secondary battery according to claim 1, wherein a width of an overlapping region of both side groove walls of the annular clamping groove and the burring part is greater than 1/5 of a width of the burring part.

7. The secondary battery according to claim 1, wherein the burring and the annular clamping groove are configured to be able to disengage the burring from the annular clamping groove to release the pressure in the secondary battery when the pressure in the secondary battery is greater than a preset value.

8. The secondary battery according to claim 1, wherein the cap plate is provided with a weak portion configured to be broken to release the pressure in the secondary battery when the pressure in the secondary battery is greater than a preset value.

9. The secondary battery according to claim 1, wherein a switching tab is provided between the cap plate and the electrode assembly, and the tab of the electrode assembly is electrically connected to the cap plate or the case through the switching tab.

10. A powered device comprising the secondary battery according to any one of claims 1 to 9.