CN220527046U - Top cover assembly and battery - Google Patents

Abstract

The application provides a top cap subassembly for battery technology field specifically is a top cap subassembly, include: a top cover sheet with a first surface and a second surface which are oppositely arranged, wherein the top cover sheet is provided with a first through hole which is respectively communicated with the first surface and the second surface; the sealing cover is positioned in the first through hole and is close to the first surface, and the sealing cover is connected with the top cover sheet in a sealing way; a first groove is formed in one side, away from the second surface, of the sealing cover; the second surface is provided with a second groove which is arranged around the first through hole; the direction perpendicular to the first surface and pointing from the second surface to the first surface is a first direction, and in the orthographic projection perpendicular to the plane where the first direction is located, the first through hole is located in the second groove. The top cover assembly can ensure that the end part of the sealing cover is uniformly deformed in the mounting and matching process of the sealing cover and the first through hole, and can also avoid the breakage of the first through hole and the second groove, so that the assembly quality is improved. The application also provides a battery, comprising the top cover assembly.

Description

Top cover assembly and battery

Technical Field

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

Background

Under the large background of global energy conservation, emission reduction and sustainable development, new energy is expected to replace fossil energy, and the new energy technology is widely applied to the fields of automobiles, heavy trucks, agricultural unmanned aerial vehicles, electric tools and the like.

The power battery has the characteristics of high energy density, long cycle life, no memory effect, environmental friendliness and the like, and is widely applied to plug-in hybrid electric vehicles, hybrid electric vehicles and pure electric vehicles.

However, in the manufacturing process of the power battery, the sealing cover needs to be installed in the first through hole of the top cover sheet, and in the installation process, the sealing cover is subjected to force in the same direction as the central axis of the first through hole and is easy to deform irregularly; in addition, because the end face of the top cover sheet, which is close to the battery cell, is also provided with the annular first through hole bottom groove, the first through hole bottom groove is arranged at the periphery of the bottom of the first through hole, so that the structure between the first through hole and the first through hole bottom groove is weak in the assembly process of the sealing cover and the first through hole, the structural strength is low, and phenomena such as fracture are easy to occur.

Disclosure of Invention

In view of this, when installing in the first through-hole of cover plate to sealed lid among the prior art, sealed lid produces irregular deformation and first through-hole department and breaks technical problem easily, this application provides a top cap subassembly, also can avoid the fracture of first through-hole and first through-hole bottom recess department on the cover plate when guaranteeing sealed lid and the installation cooperation in-process of first through-hole's the even deformation of sealed lid tip, has improved assembly quality.

In order to achieve the above purpose, the present application provides the following technical solutions:

a header assembly, comprising:

the top cover plate is provided with a first surface and a second surface which are oppositely arranged, and a first through hole which is respectively communicated with the first surface and the second surface is formed in the top cover plate;

the sealing cover is positioned in the first through hole and is close to the first surface, and the sealing cover is in sealing connection with the top cover sheet;

a first groove is formed in one side, away from the second surface, of the sealing cover;

the second surface is provided with a second groove, the second groove is arranged around the first through hole, the direction perpendicular to the first surface and pointing to the first surface from the second surface is a first direction, and in the orthographic projection perpendicular to the plane where the first direction is located, the first through hole is located in the second groove.

Optionally, the first through hole is a counter bore, the first through hole includes a first sub-hole and a second sub-hole that communicate with each other, the internal diameter of the first sub-hole is greater than the internal diameter of the second sub-hole, and the sealing cover is disposed in the first sub-hole.

Optionally, the sealing cover has relative first terminal surface and the second terminal surface that sets up, first recess is seted up the first terminal surface, the second terminal surface butt is in first sub-hole with the second sub-hole forms on the step face, the diameter of second terminal surface is less than or equal to the diameter of step face.

Optionally, in the first direction, the inner diameter of the first sub-hole and the outer diameter of the sealing cover are gradually expanded.

Optionally, the sealing cover comprises an outer wall surface, two sides of the outer wall surface are respectively connected with the first end surface and the second end surface, and an included angle between the outer wall surface and the second end surface is A; the first sub-hole comprises an inner wall surface, wherein the included angle between the inner wall surface and the step surface is B, and the A and the B satisfy the following conditions: a is more than or equal to B.

Optionally, in the first direction, the plane of the first end face is not higher than the plane of the first surface.

Optionally, sealant nails are arranged in the second sub-holes.

Optionally, the sealing cover is provided with a first end face and a second end face which are oppositely arranged, and the first groove is formed in the first end face; in the first direction, the inner diameter of the first groove is gradually expanded, the depth of the first groove is H1, H1 is more than or equal to 0.1mm and less than or equal to 2mm, and the first groove is in a circular truncated cone shape or a conical shape;

when the first groove is in a truncated cone shape, the first groove comprises a groove inner side surface and a groove bottom surface, and an included angle between the groove inner side surface and the groove bottom surface is C, wherein C is more than 110 degrees and less than or equal to 150 degrees; the ratio of the area of the bottom surface of the groove to the area of the second end surface is K, and K is less than or equal to 0.9;

when the first groove is conical, the vertex angle of the first groove is E, and E is more than or equal to 80 degrees and less than or equal to 145 degrees.

Optionally, the top cover sheet further includes a protruding portion, where the protruding portion is located on the second surface, the protruding portion includes a first sub-portion and a second sub-portion that are sequentially disposed around the first through hole, and the second groove is disposed around the second sub-portion;

in the first direction, the thickness of the first sub-portion is greater than that of the second sub-portion, and in the orthographic projection perpendicular to the plane in which the first direction is located, the first groove is located in the first sub-portion.

Optionally, the sealing cover is made of metal, the sealing cover is riveted in the first through hole, and the central axis of the first groove coincides with the central axis of the sealing cover.

The application also provides a battery, including casing, electric core with the top cap subassembly, the top cap piece of top cap subassembly covers on the opening of casing, the electric core sets up the inner chamber of casing.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic view of a battery of the present application;

FIG. 2 is a schematic cross-sectional view of cell A-A of FIG. 1;

FIG. 3 is a schematic cross-sectional view of a cap piece with a seal cap and sealant nails installed therein;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a schematic cross-sectional view of a coversheet in the present application;

FIG. 6 is an enlarged view of portion B of FIG. 5;

FIG. 7 is a schematic view of an embodiment of a seal cap of the present application;

FIG. 8 is a cross-sectional view of FIG. 7;

FIG. 9 is a schematic view of another embodiment of a seal cap of the present application;

FIG. 10 is a schematic view of the lower surface of the roof sheet of the present application;

in fig. 1-10:

1. a top cover sheet; 2. sealing cover; 3. sealing glue nails; 4. a housing; 5. a battery cell;

11. a first through hole; 111. a first sub-aperture; 111a, an inner wall surface; 111b, a step surface; 112. a second sub-aperture; 113. a second groove;

21. a first groove; 211. the inner side surface of the groove; 212. the bottom surface of the groove; 22. a second end face; 23. an outer wall surface;

6. lower plastic; 61. and a second through hole.

D1, diameter of the second end face; d2, diameter of the step surface; d3, diameter of the first end face; d4, diameter of the top surface of the first sub-hole;

h1, the depth of the first groove; h2, thickness of the sealing cover; h3, depth of the first sub-hole.

Detailed Description

The application provides a top cap subassembly, can also avoid the fracture of first through-hole and first through-hole second recess department on the top cap when guaranteeing the even deformation of sealed lid tip in the installation cooperation in-process of sealed lid and first through-hole, improved assembly quality.

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

As shown in fig. 3-5, embodiments of the present application provide a top cap assembly comprising: a top cover sheet 1 and a sealing cover 2, the top cover sheet 1 having a first surface and a second surface disposed opposite to each other, a distance between the first surface and the second surface being a thickness of the top cover sheet 1; as shown in fig. 3, the direction Y in the drawing is the thickness direction of the top cover sheet 1, and in fig. 4, the surface of the top cover sheet 1 in the Y1 direction is a first surface and the surface in the Y2 direction is a second surface; the Y1 direction is the first direction;

the top cover sheet 1 is provided with a first through hole 11, and the first through hole 11 communicates the first surface with the second surface;

the first through hole 11 is usually arranged on the positive electrode column side, and the shell 4 is usually an aluminum shell and is positively charged, so that the short circuit of the positive electrode and the negative electrode during liquid injection can be prevented;

the sealing cover 2 is positioned in the first through hole 11 and is close to the first surface, and the sealing cover 2 is in sealing connection with the top cover plate 1 so as to prevent electrolyte in the battery from leaking out;

the sealing cover 2 can be placed in the first through hole 11 from the end of the first through hole 11 near the first surface and can be in sealing connection with the first through hole 11, and the sealing cover 2 and the first through hole 11 can be connected in an interference fit mode by applying downward axial force through stamping, beating or other modes;

a first groove 21 is formed in one side, away from the second surface, of the sealing cover 2; in this way, during the process of installing the sealing cover 2 into the first through hole 11, typically when the sealing cover 2 is in interference fit connection with the first through hole 11, the first end of the sealing cover 2 can collapse towards the first groove 21, so as to avoid irregular deformation;

a second groove 113 is further formed on the second surface of the top cover sheet 1, the second groove being disposed around the first through hole 11, and the first through hole 11 being located in the second groove 113 in a projection perpendicular to the plane in which the first direction is located, that is, in a projection of the second surface; in this way, the projections of the first through-hole 11 and the second recess 113 in the first direction may be offset from each other, avoiding thus affecting the structural strength of the cover sheet 1 at the first through-hole 11 and the second recess 113.

In summary, in the process of mounting and matching the sealing cover 2 and the first through hole 11, the first groove 21 is arranged on the sealing cover 2, so that the end part of the sealing cover 2 can be uniformly deformed; the projection of the first through hole 11 in the first direction of the top cover sheet 1 is arranged in the second groove 113, so that the structural strength of the top cover sheet 1 at the first through hole 11 and the second groove 113 is ensured, the condition that the first through hole 11 and the second groove 113 on the top cover sheet 1 are easy to break is improved, the assembly process of the sealing cover 2 and the first through hole 11 is optimized, and the assembly quality is improved.

Preferably, the first through hole 11 is a counter bore, the first through hole 11 comprises a first sub-hole 111 and a second sub-hole 112 which are communicated with each other, the inner diameter of the first sub-hole 111 is larger than that of the second sub-hole 112, and the sealing cover 2 is arranged in the first sub-hole 111; the sealing cover 2 is in interference fit and sealing connection with the first sub-hole 111; preferably, the second sub-holes 112 are also provided with sealant nails 3, and the sealant nails 3 can block the second sub-holes 112, so that the electrolyte in the shell 4 is further prevented from leaking; the sealing cover 2 with a larger end surface has the function of reinforcing the sealing glue nail 3 with a smaller end surface and preventing the sealing glue nail 3 from falling out.

In a preferred embodiment, the sealing cover 2 has a first end face and a second end face 22 which are oppositely arranged, the first groove 21 is formed on the first end face, the second end face 22 is abutted against a step face 111b formed by the first sub-hole 111 and the second sub-hole 112, and the diameter D1 of the second end face 22 is smaller than or equal to the diameter D2 of the step face 111 b;

in order to realize that the second end face 22 can be attached to the step face 111b, the diameter D1 of the second end face 22 may be set to be smaller than or equal to the diameter D2 of the step face 111b, so that after the second end face 22 is subjected to the axial force, the second end face 22 will not interfere with the inner wall face 111a, thereby ensuring that the second end face 22 can be attached to the step face 111b, and the second end face 22 can be abutted to the sealant nails 3 in the second sub-holes 112, so as to avoid axial displacement of the sealant nails 3.

As shown in fig. 3 to 6, in a preferred embodiment, the inner diameter of the first sub-hole 111 and the outer diameter of the sealing cover 2 are gradually widened in the first direction, so that the sealing cover 2 can be smoothly assembled when being assembled into the first sub-hole 111, and in this embodiment, the first sub-hole 111 is in a circular truncated cone shape, and the sealing cover 2 is also in a circular truncated cone shape;

further, in order to ensure that the sealing cover 2 is assembled with the first sub-hole 111 in an interference manner, the sealing connection is achieved, and as shown in fig. 4, the diameter D3 of the first end surface of the sealing cover 2 is larger than the diameter D4 of the top surface of the first sub-hole 111.

In a preferred embodiment, in order to ensure that the sealing cover 2 is assembled with the first sub-hole 111 in an interference manner, and achieve the effect of fixed connection, the sealing cover 2 includes an outer wall surface 23, two sides of the outer wall surface 23 are respectively connected with a first end surface and a second end surface 22, an included angle between the outer wall surface 23 and the second end surface 22 is a, the first sub-hole 111 includes an inner wall surface 111a, and an included angle between the inner wall surface 111a and the step surface 111B is B, where a and B satisfy: a is more than or equal to B; further, preferably, a and B are both obtuse angles; in this way, when the first end face of the sealing cover 2 is assembled, since A, B is an obtuse angle and the angle B is less than or equal to a, the inner wall face 111a of the first sub-hole 111 generates resistance to the outer wall face 23 of the sealing cover 2 in the direction perpendicular to the inner wall face 111a, and since B is an obtuse angle, the resistance in the direction perpendicular to the inner wall face 111a is inclined upward, so that the first end face of the sealing cover 2 is more easily retracted, and interference fit is ensured.

In a preferred embodiment, the first end face is in a plane not higher than the plane of the first surface in the first direction so as not to interfere with the aesthetic appearance of the battery case 4; specifically, the distance between the first end surface and the second end surface 22, that is, the thickness H2 of the sealing cover 2, and the distance between the top surface of the first sub-hole 111 and the step surface 111b, that is, the depth H3 of the first sub-hole 111, where the thickness H2 of the sealing cover 2 may be smaller than or equal to the depth H3 of the first sub-hole, so that it may be avoided that the first end surface protrudes from the first surface after the sealing cover 2 is excessively thick to cause interference fit with the first sub-hole 111.

Preferably, the second sub-holes 112 are further provided with sealant nails 3, and the sealant nails 3 can block the second sub-holes 112, so that electrolyte in the casing 4 is further prevented from leaking.

Preferably, in order to ensure that a good collapsing effect is achieved and to avoid an unexpected deformation, since in the above embodiment the sealing cover 2 is in the shape of a truncated cone, in order to match the shape of the first groove 21 with the shape of the outer wall surface 23 of the sealing cover 2, i.e. the inner diameter of the first groove 21 also gradually expands in the first direction, the shape of the first groove 21 may be in the shape of a truncated cone, or the shape of the first groove 21 may be in the shape of a cone.

In a preferred embodiment, as shown in fig. 7 and 8, the first groove 21 is in a shape of a truncated cone, where the first groove 21 includes a groove inner side surface 211 and a groove bottom surface 212, specifically, as shown in fig. 8, an included angle formed by the groove inner side surface 211 and the groove bottom surface 212 is C, and the range of C is preferably 110 ° < c+.ltoreq.150°, and specifically, in this embodiment, the value of C is 120 °.

Preferably, in order to avoid that the area of the bottom surface 212 of the groove is too large to affect the structural strength of the sealing cover 2, the ratio K of the area of the bottom surface 212 of the groove to the area of the second end surface 22 is preferably 0.9 or less.

In another preferred embodiment, as shown in FIG. 9, the first recess 21 is conical, and the angle of the apex of the first recess 21 is E, and E is preferably in the range of 80 DEG.ltoreq.E.ltoreq.145%; specifically, in this embodiment, the value of E is 85 °.

In addition, in order to avoid the too deep depth H1 of the first groove 21 to damage the structural strength of the sealing cover 2 and ensure that the deformation requirement of the first end of the sealing cover 2 is met, the range of the depth H1 of the first groove 21 is preferably set to be 0.1 mm-2 mm; specifically, in this example, the value of H1 is 1mm.

Preferably, as shown in fig. 4, the top sheet 1 further comprises a projection located on the second surface, i.e. the lower surface in the figure; the protruding part comprises a first sub-part and a second sub-part which are sequentially arranged around the first through hole 11, and the second groove 113 is arranged around the second sub-part;

specifically, the first sub-portion is an inner ring close to the second sub-hole 112, that is, a section parallel to the second surface in fig. 4, and the second sub-portion is a section far away from the second sub-hole 112 and close to the second groove 113, and an included angle exists between the second sub-portion and the first sub-portion;

in the first direction, the first sub-portion has a greater thickness than the second sub-portion, and in an orthographic projection perpendicular to a plane in which the first direction lies, the first recess 21 is located in the first sub-portion.

When the sealing cover 2 is assembled into the first sub-hole 111, the first groove 21 deforms so as to press the corresponding part of the second end surface 22, thereby conducting pressure to the first sub-part; because the first groove 21 is located in the first sub-portion, the thickness of the first sub-portion is larger than that of the second sub-portion, so that the condition that the first through hole 11 and the second groove 113 on the top cover plate 1 are easy to break is avoided, the assembly process of the sealing cover 2 and the first through hole 11 is optimized, and the assembly quality is improved.

Preferably, the sealing cover 2 and the first groove 21 are both rotating bodies, that is, the sealing cover 2 and the first groove 21 each have a central axis, and the central axis generally refers to a straight line dividing a plane or a solid into symmetrical parts; refers to a line, also called an axis, about which an object or a three-dimensional figure rotates or about which rotation is envisaged. In order to uniformly deform the sealing cap 2 during the process of fitting into the first through hole 11, that is, during the caulking stress, the first end of the sealing cap 2 uniformly collapses into the first groove 21, and the central axis of the first groove 21 coincides with the central axis of the sealing cap 2.

In addition, as shown in fig. 10, a lower plastic 6 is further disposed on the second surface of the top cover 1, the lower plastic 6 covers the second sub-hole 112, and the sealing cover 2 is coaxial with the second through hole 61 formed in the lower plastic 6.

Preferably, the sealing cover 2 is made of metal, so that the strength and toughness of the sealing cover 2 can be ensured; specifically, elemental metal, typically aluminum, may be used, or an alloy material, such as an aluminum alloy material, may be used;

preferably, the sealing cover 2 and the first through hole 11 are connected through riveting interference fit, or interference fit connection can be realized by adopting a temperature difference method.

As shown in fig. 1-3, the application further provides a battery, which comprises the top cover assembly, a shell 4 and a battery cell 5, wherein the top cover sheet 1 of the top cover assembly covers the opening of the shell 4, and the battery cell 5 is arranged in the inner cavity of the shell 4.

The basic principles of the present application have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not limiting, and these advantages, benefits, effects, etc. are not to be considered as necessarily possessed by the various embodiments of the present application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not intended to be limited to the details disclosed herein as such.

The block diagrams of the devices, apparatuses, devices, systems referred to in this application are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The words "or" and "as used herein refer to the word" or "and are used interchangeably herein unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.

It is also noted that in the apparatus, devices and methods of the present application, the components or steps may be separated or recombined. Such decomposition or recombination should be considered as equivalent to the present application.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

It should be understood that the terms "first," "second," "third," "fourth," "fifth," and "sixth" used in the description of the embodiments of the present application are merely used for clarity in describing the technical solutions, and are not intended to limit the scope of the present application.

The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

Claims (11)

1. A header assembly, comprising:

the top cover plate is provided with a first surface and a second surface which are oppositely arranged, and a first through hole which is respectively communicated with the first surface and the second surface is formed in the top cover plate;

the sealing cover is positioned in the first through hole and is close to the first surface, and the sealing cover is in sealing connection with the top cover sheet;

a first groove is formed in one side, away from the second surface, of the sealing cover;

the second surface is provided with a second groove, the second groove is arranged around the first through hole, the direction perpendicular to the first surface and pointing to the first surface from the second surface is a first direction, and in the orthographic projection perpendicular to the plane where the first direction is located, the first through hole is located in the second groove.

2. The cap assembly of claim 1, wherein the first through hole is a counterbore, the first through hole includes a first sub-hole and a second sub-hole in communication with each other, the first sub-hole has an inner diameter greater than an inner diameter of the second sub-hole, and the seal cap is disposed within the first sub-hole.

3. The cap assembly of claim 2, wherein the sealing cap has a first end surface and a second end surface disposed opposite to each other, the first groove is formed in the first end surface, the second end surface abuts against a stepped surface formed by the first sub-hole and the second sub-hole, and a diameter of the second end surface is equal to or smaller than a diameter of the stepped surface.

4. The cap assembly of claim 2, wherein in the first direction, an inner diameter of the first sub-aperture and an outer diameter of the seal cap diverge.

5. The cap assembly of claim 3, wherein the sealing cap comprises an outer wall surface, two sides of the outer wall surface are respectively connected with the first end surface and the second end surface, and an included angle between the outer wall surface and the second end surface is a;

the first sub-hole comprises an inner wall surface, wherein the included angle between the inner wall surface and the step surface is B, and the A and the B satisfy the following conditions: a is more than or equal to B.

6. The header assembly of claim 3, wherein in the first direction, the first end face is at a plane no higher than the plane of the first surface.

7. The header assembly of claim 2, wherein sealant nails are disposed within the second sub-apertures.

8. The cap assembly of claim 1, wherein the seal cap has oppositely disposed first and second end surfaces, the first recess opening into the first end surface; in the first direction, the inner diameter of the first groove is gradually expanded, the depth of the first groove is H1, H1 is more than or equal to 0.1mm and less than or equal to 2mm, and the first groove is in a circular truncated cone shape or a conical shape;

when the first groove is in a truncated cone shape, the first groove comprises a groove inner side surface and a groove bottom surface, an included angle between the groove inner side surface and the groove bottom surface is C,110 degrees is less than or equal to 150 degrees, the ratio of the area of the groove bottom surface to the area of the second end surface is K, and K is less than or equal to 0.9;

when the first groove is conical, the vertex angle of the first groove is E, and E is more than or equal to 80 degrees and less than or equal to 145 degrees.

9. The header assembly of claim 1, wherein the header sheet further comprises a protrusion located on the second surface, the protrusion comprising a first sub-portion and a second sub-portion disposed sequentially around the first through hole, the second groove disposed around the second sub-portion;

in the first direction, the thickness of the first sub-portion is greater than that of the second sub-portion, and in the orthographic projection perpendicular to the plane in which the first direction is located, the first groove is located in the first sub-portion.

10. The cap assembly of claim 1, wherein the sealing cap is made of metal, the sealing cap is riveted in the first through hole, and a central axis of the first groove coincides with a central axis of the sealing cap.

11. A battery, comprising a housing, a battery cell and the cap assembly according to any one of claims 1-10, wherein the cap sheet of the cap assembly covers the opening of the housing, and the battery cell is disposed in the inner cavity of the housing.