CN221102339U - Converging disk assembly and battery monomer - Google Patents

Abstract

The application provides a confluence disc assembly which is arranged at the top of a core pack, wherein the core pack comprises a first electrode lug and a second electrode lug, the first electrode lug and the second electrode lug are opposite in electrical property, the assembly comprises a first confluence sheet, a second confluence sheet and an insulating piece, and the first confluence sheet is used for being electrically connected with one of the first electrode lug or the second electrode lug; the second bus plate comprises a sinking groove and a second hollow hole, and the sinking groove is used for being electrically connected with the other one of the first tab or the second tab; the insulating part is arranged between the first bus bar and the second bus bar and comprises a cover body and a first hollow hole, wherein the cover body is used for accommodating the first bus bar, and the first hollow hole and the second hollow hole are arranged in a stacked mode to expose part of the first bus bar. The collecting disc assembly has better safety performance. A battery cell including the above-described busway plate assembly is also provided.

Description

Converging disk assembly and battery monomer

Technical Field

The utility model relates to the field of batteries, in particular to the field of bus plates.

Background

For the single body, the positive electrode tab and the negative electrode tab are arranged on one side of the battery, so that a current loop can be concentrated on one end of the battery, and an electron path can be shortened, but higher requirements are also put on the safety of the battery.

Disclosure of utility model

An object of the present utility model is to provide a busbar assembly with better safety performance.

The bus plate assembly for achieving the purpose is arranged at the top of the core pack, the core pack comprises a first tab and a second tab, the first tab and the second tab are opposite in electrical property, the assembly comprises a first bus plate, a second bus plate and an insulating piece, and the first bus plate is used for being electrically connected with one of the first tab or the second tab; the second bus plate comprises a sinking groove and a second hollow hole, and the sinking groove is used for being electrically connected with the other one of the first tab and the second tab; the insulating part is arranged between the first bus bar and the second bus bar and comprises a cover body and a first hollow hole, wherein the cover body is used for accommodating the first bus bar, and the first hollow hole and the second hollow hole are arranged in a stacked mode so as to expose part of the first bus bar.

In one or more embodiments, the first tab and the second tab each include a plurality of regions, the first bus bar includes a central platform and a plurality of connection portions, each connection portion is configured to electrically connect with one of the first tab or the second tab, and the central platform is disposed below the first hollow hole and the second hollow hole.

In one or more embodiments, the central platform is provided with a protrusion towards the side of the core pack.

In one or more embodiments, the protrusions have a diameter ranging from 3mm to 8mm and a height ranging from 0.8.mm to 3mm.

In one or more embodiments, the insulating member includes a lateral baffle extending in an axial direction of the core pack and disposed around an outer peripheral side of the first bus bar.

In one or more embodiments, the second busbar includes a flush first electrical connection face disposed above the shroud and a second electrical connection face disposed radially outward of the sink recess.

In one or more embodiments, below the second electrical connection face is a cavity structure or a thickened structure.

Another object of the present utility model is to provide a battery cell, including a core pack, a busbar assembly, a top case, a post and a casing, wherein the core pack includes a positive electrode tab and a negative electrode tab; the converging disc assembly is arranged at the end part of the core bag, and the top shell is provided with a pole hole for being attached to the second connecting sheet of the converging disc assembly; the pole column penetrates through the pole hole, and the tail end of the pole column is attached to the first confluence sheet of the confluence disc assembly; and a shell for wrapping the core pack.

In one or more embodiments, the positive electrode tab and the negative electrode tab each include a plurality of fan-ring regions that diffuse from the core-wrap axis side to the outer peripheral side, and are symmetrically disposed along the core-wrap axis.

In one or more embodiments, the shortest radius of the sector ring area of the tab electrically connected with the first bus bar is smaller than the shortest radius of the sector ring area of the tab of another attribute.

Above-mentioned collection flow disc subassembly has realized effectively keeping apart first conflux piece and second conflux piece through the insulating part that sets up to have the cover body, is applicable to the utmost point ear structure that has the multizone simultaneously, concentrates the current return circuit in the battery tip safely to the security of battery, module and battery package has been improved.

Drawings

The above and other features, properties and advantages of the present utility model will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, in which:

FIG. 1 is a schematic illustration of a housing of a battery cell;

FIG. 2 is a schematic view of the split installation of the components of the core pack and manifold assembly;

FIG. 3 is a schematic illustration of the assembled position of the core pack and the manifold assembly as a whole;

FIG. 4 is a schematic view of a first bus bar, an insulator, and a second bus bar;

FIG. 5 is a schematic view of a first bus bar;

FIG. 6 is a schematic view of a second bus bar;

FIG. 7 is a cross-sectional view taken along the direction F-F in FIG. 5;

FIG. 8 is a cross-sectional view taken along the direction J-J in FIG. 6;

FIG. 9A is a cross-sectional view of one embodiment of FIG. 6 along the direction I-I;

FIG. 9B is a cross-sectional view of another embodiment of FIG. 6 taken along the direction I-I;

fig. 10 is a top view of a battery cell;

FIG. 11 is a cross-sectional view taken along the line A-A in FIG. 10;

FIG. 12 is a cross-sectional view taken along the direction B-B in FIG. 10;

fig. 13 is an enlarged view at C in fig. 11;

fig. 14 is an enlarged view of D in fig. 11;

fig. 15 is an enlarged view at E in fig. 12.

Detailed Description

The present utility model will be further described with reference to specific embodiments and drawings, in which more details are set forth in the following description in order to provide a thorough understanding of the present utility model, but it will be apparent that the present utility model can be embodied in many other forms than described herein, and that those skilled in the art may make similar generalizations and deductions depending on the actual application without departing from the spirit of the present utility model, and therefore should not be construed to limit the scope of the present utility model in terms of the content of this specific embodiment.

It is noted that these and other figures are merely examples, which are not drawn to scale and should not be construed as limiting the scope of the utility model as it is actually claimed.

Fig. 1 to 3 illustrate a battery cell structure including a core pack 10, a bussing plate assembly 20, a top case 30, a post 40, and a housing 50. The outer case 50 is used to wrap the outside of the core pack 10, the top case 30 is provided at the end of the core pack 10, and the pole 40 is mounted on the top case 30. The housing 50 may be integrally formed with the top case 30 or may be provided separately.

The core pack 10 includes a first tab 11 and a second tab 12, and the electrical properties of the first tab 11 and the second tab are always opposite. The busbar assembly 20 is disposed at an end of the core pack 10 and electrically connected to the first tab 11 and the second tab 12.

Specifically, the first bus plate is used for realizing electric connection with one of the first tab and the second tab, and the second bus plate is used for realizing electric connection with the other one of the first tab and the second tab.

In the embodiment shown in the drawings of the present application, the first tab 11 is referred to as a positive tab, and the second tab 12 is referred to as a negative tab. It will be appreciated by those skilled in the art that the first tab 11 may also be a negative tab, and the second tab 12 may also be a positive tab.

Further, referring to an embodiment of the busbar assembly 20 shown in fig. 2 to 4, in this embodiment, the busbar assembly 20 includes a first busbar 21, an insulating member 23 and a second busbar 22 stacked in sequence, the first busbar is electrically connected to the first tab 11, the second busbar 22 includes a sinking groove 223 and a hollowed second hollow hole 222, and the sinking groove 223 is electrically connected to the second tab 12.

The above and below descriptions use terms such as "first" and "second" to define the components, and are only for convenience of distinguishing the corresponding components, and if not otherwise stated, the terms are not used in a specific sense, are not limited in number, and therefore should not be construed as limiting the scope of the present application.

With continued reference to fig. 2 to 4, the insulating member 23 is disposed between the first and second bus plates 21 and 22, and includes a cover 230 and a first hollow hole 231, the cover 230 being configured to accommodate the first bus plate 21, and the first and second hollow holes 231 and 222 being stacked to expose a portion of the first bus plate 21.

That is, the insulator 23 wraps and covers the first bus bar 21 and the portion of the first tab 11 that contacts the first bus bar 21 by means of the cover 230, and the second bus bar 22 is located above the insulator 23, thereby achieving isolation from the first bus bar 21.

As shown in fig. 4, to improve the insulation performance of the insulating member 23, the insulating member 23 further includes a lateral barrier 233, and the lateral barrier 233 is disposed at both the cover 230 and the first hollow hole 231. The lateral barrier 233 extends substantially along the axis S direction of the core pack 10 and is disposed around a circle of the outer peripheral side of the first bus bar 21 so as to completely wrap the first bus bar 21 so that it is physically insulated from the second bus bar 22. Except for the surface of the first bus bar 21 located under the first hollow hole 231, the other areas of the first bus bar 21 are all covered with the insulating member 23.

The busbar assembly 20 is also applicable to multi-region distributed tab structures. As in the embodiment shown in fig. 3, the first tab 11 and the second tab 12 each include a plurality of regions, and providing a plurality of tab regions can make the current flowing therethrough more uniform.

Preferably, the first tab 11 and the second tab 12 each include a plurality of sector ring-shaped regions that diffuse from the core-in axis side to the outer peripheral side, and are disposed symmetrically with respect to the axis S of the core-in 10. The tab regions symmetrical about the axis S are of the same polarity.

The shortest radius R1 of the fan ring area of the first tab 11 electrically connected to the first bus bar 21 is smaller than the shortest radius R2 of the fan ring area of the second tab 12. R1 is smaller than R2 and can guarantee that the first tab occupies more areas, the contact area with the first confluence sheet is larger, current conduction is facilitated, and temperature rise of the pole is reduced.

In order to adapt to the multi-region tab structure, the first bus bar 21 includes a central platform 210 and a plurality of connection portions 211, as shown in fig. 4, 5 and 7, each connection portion 211 is used for contacting one of the positive electrode tab 11 or the negative electrode tab 12 to realize electrical connection, and the central platform 210 is disposed below the first hollow hole 231 and the second hollow hole 233. When the two-part fan ring structure of the first tab 11 is symmetrical with respect to the axis S direction, the connection portion 211 of the first bus bar 21 exhibits an "8" type axisymmetric structure.

It can be understood that when the plurality of ring structures of the first tab 11 are symmetrically disposed with respect to the axis S, the first bus bar 21 is provided with the connection portions 211 corresponding to the number and positions of the ring structures.

Referring to fig. 3, 6 and 8, the second bus bar 22 is located above the insulator 23, symmetrically disposed with respect to the core pack axis S direction, and has a symmetrical fan-shaped sink groove 223 and a second hollow hole 222.

The upper surface of the second bus bar 22 includes a first electrical connection surface 225 and a second electrical connection surface 226 that are disposed flush, the first electrical connection surface 225 being disposed above the cover 230, and the second electrical connection surface 226 being disposed radially outward of the sink recess 223.

As shown in fig. 9A and 9B, a cavity structure 228 or a thickened structure 227 is disposed below the second electrical connection surface 226, and both structures can ensure that the core package is not damaged by penetration during welding connection between the connection sheet and the housing.

For the cavity structure 228, the second busbar 22 is further provided with a first support 224 and a second support 229, the first support 224 is disposed at the outer edge of the second busbar 22, and the second support 229 is disposed at the connection position between the sinking groove 223 and the cavity structure 228, so that the flatness and the height of the electrical connection surface are guaranteed.

In some embodiments, no thickened design is employed for the first electrical connection face 225. Compared with the second electrical connection surface 226, the first electrical connection surface 225 is only in physical contact with the top case 30, so that the flatness of the whole second bus bar 22 is ensured, and the welding yield at the second connection surface 226 is improved.

Preferably, the area contacting the top case 30 with the second bus bar is provided to have a certain thickness, and the thickness design at the second connection surface 226 shown in fig. 15 can avoid influencing the tab when welding there.

The design of the bus plate assembly enables the first bus plate and the second bus plate to be in a better insulating state, so that the electric connection between the anode bus plate and the cathode bus plate and the core pack can be completed synchronously, the battery manufacturing period is shortened, a current loop is safely concentrated on the top cover assembly, an electronic transmission path is shortened, the heating problem in the battery using process is reduced, and the safety of the battery, the module and the battery pack is improved.

In connection with the above description of the busbar assembly, it will be further understood that a battery cell, the top case 30 is provided with a pole hole 301 for attaching to the second connecting piece 22 of the busbar assembly 20, the pole 40 is disposed through the pole hole 301, and the tail end of the pole 40 is attached to the first busbar 21 of the busbar assembly 20.

In some embodiments the post 40 is provided with a centrally located blind hole 401 as shown in fig. 13, whereby the central platform 210, which is in abutment with the portion, is provided with a projection 214 towards the side of the core pack 10, as shown in fig. 7 in a "T" shape. Therefore, the first bus bar 21 conducts one pole of the core pack to the center platform 210, and the protrusion 214 of the center platform 210 is matched with the blind hole 401 of the pole 40, so that reliable electrical connection in a welding mode is realized.

Preferably, the diameter D of the protrusions 214 ranges from 3mm to 8mm, and the height H of the protrusions 214 ranges from 0.8mm to 3mm.

An insulator 60 is further provided between the post 40 and the busbar assembly and the top case 30 as shown in fig. 11 to 15 to further enhance the isolation effect.

The battery monomer structure can shorten the electronic transmission path, reduce the heating problem in the use process of the battery, is beneficial to improving the safety of the battery, the module and the battery pack, and can also shorten the manufacturing process flow of the battery, thereby obviously improving the production efficiency.

In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

The application uses specific words to describe embodiments of the application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.

While the utility model has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the utility model, as will occur to those skilled in the art, without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present utility model fall within the protection scope defined by the claims of the present utility model.

Claims (10)

1. The collection flow disc subassembly sets up at core package top, the core package includes first utmost point ear and second utmost point ear, first utmost point ear with the electric property of second utmost point ear is opposite, its characterized in that, this subassembly includes:

the first bus plate is used for being electrically connected with one of the first electrode lug or the second electrode lug; and

The second bus plate comprises a sinking groove and a second hollow hole, and the sinking groove is used for being electrically connected with the other one of the first tab and the second tab; and

The insulating part is arranged between the first bus bar and the second bus bar and comprises a cover body and a first hollow hole, wherein the cover body is used for accommodating the first bus bar, and the first hollow hole and the second hollow hole are arranged in a stacked mode so as to expose part of the first bus bar.

2. The busway assembly of claim 1, wherein said first tab and said second tab each comprise a plurality of regions,

The first bus plate comprises a center platform and a plurality of connecting parts, each connecting part is used for being electrically connected with one of the first lug or the second lug, and the center platform is arranged below the first hollow hole and the second hollow hole.

3. The manifold assembly of claim 2, wherein the central platform is provided with a protrusion on a side facing the core pack.

4. A manifold assembly as claimed in claim 3 wherein said protrusions have a diameter in the range of 3mm to 8mm and a height in the range of 0.8mm to 3mm.

5. The busway assembly of claim 1, wherein the insulator comprises a lateral baffle extending in the axial direction of the core pack and disposed about the outer peripheral side of the first busway sheet.

6. The busway assembly of claim 1, wherein the second busway sheet comprises flush first and second electrical connection surfaces, the first electrical connection surface disposed above the shroud and the second electrical connection surface disposed radially outward of the sink recess.

7. The busway assembly of claim 6, wherein a cavity structure or a thickened structure is provided below the second electrical connection face.

8. A battery cell, comprising:

the core package comprises a positive electrode tab and a negative electrode tab;

the busway assembly of any of claims 1-7, disposed at an end of a core pack;

the top shell is provided with a pole hole and is used for being attached to the second connecting sheet of the confluence disc assembly;

the pole penetrates through the pole hole, and the tail end of the pole is attached to the first confluence sheet of the confluence disc assembly; and

And a shell for wrapping the core pack.

9. The battery cell as defined in claim 8, wherein the positive electrode tab and the negative electrode tab each include a plurality of sector ring regions that diffuse from the core pack axial side to the outer peripheral side, and are symmetrically disposed along the core pack axial.

10. The battery cell of claim 9, wherein a shortest radius of a fanning strip region of a tab electrically connected to the first bus bar is less than a shortest radius of a fanning strip region of another attribute tab.