CN214848951U

CN214848951U - Utmost point ear subassembly, electric core

Info

Publication number: CN214848951U
Application number: CN202120616429.9U
Authority: CN
Inventors: 吴聪苗; 周龙
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2021-11-23
Anticipated expiration: 2031-03-26

Abstract

The application relates to the field of batteries, in particular to a tab assembly and a battery core. The tab assembly comprises a bus piece and a plurality of tabs arranged in a laminated manner; the tab comprises an organic supporting layer and a metal conducting layer; each tab is provided with at least one through hole, and a conductive medium is filled in each through hole; the conductive media are electrically connected with the metal conductive layers positioned on the two sides of the same organic supporting layer; the confluence piece is attached to the pole lug and is electrically connected with the conductive medium in the through hole of the pole lug; so that the current of each tab can be transmitted to the bus bar through the conductive medium and the metal conductive layer. Conductive medium is connected with two adjacent metal conducting layers electricity, and the piece that converges is connected with conductive medium electricity, makes the electric charge homoenergetic of every utmost point ear transmit to the piece that converges through conductive medium and metal conducting layer, and the connected mode of this application can replace the mode that the switching han connects a plurality of utmost point ears, can avoid tearing utmost point ear because the welding stress that the welding produced.

Description

Utmost point ear subassembly, electric core

Technical Field

The application relates to the field of batteries, in particular to a tab assembly and a battery core.

Background

At present, for a battery cell using a composite current collector to prepare a pole piece, a tab at the end of the pole piece is welded with a metal foil (such as a copper foil or an aluminum foil) in a transfer welding manner, then die-cut, wound, welded with a transfer piece, and finally welded with a pole; the application aims at researching a novel lug connection mode.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a tab assembly and a battery cell, which aim to provide a new tab connection mode.

The application provides a utmost point ear subassembly, utmost point ear subassembly includes:

a bus bar; and

the electrode lug comprises an organic supporting layer and a metal conducting layer arranged on at least one surface of the organic supporting layer; each tab is provided with at least one through hole, and a conductive medium is filled in each through hole; the conductive media are electrically connected with the metal conductive layers positioned on two sides of the same organic supporting layer;

the bus piece is attached to the lug and electrically connected with the conductive medium in the through hole of the lug; so that the current of each tab can be transmitted to the bus bar through the conductive medium and the metal conductive layer.

Conductive medium is connected with two adjacent metal conducting layers electricity, and the piece that converges is connected with conductive medium electricity, makes the electric charge homoenergetic of every utmost point ear transmit to the piece that converges through conductive medium and metal conducting layer, and the connected mode of this application can replace the mode that the switching han connects a plurality of utmost point ears, can avoid tearing utmost point ear because the welding stress that the welding produced.

In some embodiments of the present application, the through hole of each tab and the gap between two adjacent tabs together form a bus channel; and the gap is also filled with a conductive medium.

In some embodiments of the present application, a tab assembly is provided with a plurality of said bus channels.

In some embodiments of the present application, the tab assembly further includes a cover for covering the through-holes of the tabs at the end portions.

In some embodiments of the present application, a bus bar is attached to the tab at the end position;

or the bus piece is positioned between any two adjacent lugs, and the lugs are connected with the bus piece through fixing pieces.

In some embodiments of the present application, the distance between the axes of the through holes of two adjacent tabs is 0-2 mm.

In some embodiments of the present application, a conductive medium fills the via.

In some embodiments of the present application, the conductive medium is obtained by curing a conductive paste.

The application provides an electric core, which comprises a positive pole piece, a negative pole piece and a diaphragm for separating the positive pole piece and the negative pole piece;

the positive pole piece is provided with the pole lug assembly;

and/or the negative pole piece is provided with the pole lug assembly.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic cross-sectional view illustrating an example of a tab assembly provided by an embodiment of the present application;

fig. 2 is a schematic cross-sectional view illustrating another example of a tab assembly provided by an embodiment of the present application;

fig. 3 shows a schematic structural view of a first example of the bus duct;

fig. 4 is a schematic structural view showing a second example of the bus duct;

fig. 5 is a schematic structural view showing a third example of the bus duct;

fig. 6 is a schematic structural view showing a fourth example of the bus duct;

fig. 7 is a schematic cross-sectional view illustrating still another example of a tab assembly provided by an embodiment of the present application.

Icon: 100-a tab assembly; 110-a tab; 111-a via; 112-a sink channel; 120-a bus bar; 130-a cover body.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present application, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, refer to the orientation or positional relationship as shown in the drawings, or as conventionally placed in use of the product of the application, or as conventionally understood by those skilled in the art, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application.

Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Examples

Fig. 1 is a schematic cross-sectional view illustrating an example of a tab assembly 100 provided in an embodiment of the present application, and referring to fig. 1, the embodiment provides a tab assembly 100, and the tab assembly 100 includes a bus bar 120 and a plurality of tabs 110. In the drawings, the cross sections of the bus bar 120 and the tab 110 are not shown with hatching in order to more clearly embody the bus bar 120 and the tab 110 from the viewpoint of visibility.

The tab 110 includes an organic support layer and a metal conductive layer disposed on at least one surface of the organic support layer; the tabs 110 may be die-cut from a composite current collector. The material of the organic support layer may be a polymer, and may be, for example, one or more of polyesters, polyolefins, polyamides, polyimides, polyethers, epoxy resins, phenol resins, crosslinked products thereof, and copolymers thereof.

The metal conductive layer may be selected according to the polarity of the tab 110, and may be, for example, aluminum or an aluminum alloy; or may be copper, copper alloys, etc. Further, in some embodiments of the present application, the tab 110 may include other metal layers in addition to the organic support layer and the metal conductive layer; in other words, the metal conductive layer may be formed by one metal layer or may be formed by stacking a plurality of metal layers having different materials.

The tab assembly 100 includes a plurality of tabs 110, and the tabs 110 are stacked; each tab 110 is provided with a through-hole 111, the through-hole 111 penetrating the tab 110 in the thickness direction of the tab 110, and in fig. 1, one tab 110 is provided with one through-hole 111. It is understood that in other embodiments of the present application, two, three, four or more through holes 111 may be provided in one tab 110.

The plurality of tabs 110 are stacked, and each tab 110 is provided with a through hole 111, so that after the plurality of tabs 110 are stacked, the through hole 111 of each tab 110 and a gap between two adjacent tabs 110 jointly form a bus passage 112, and the bus passage 112 is communicated with each through hole 111. The bus duct 112 is filled with a conductive medium, and the conductive medium is electrically connected to each tab 110.

The main function of the bus bar 120 is to collect current and to electrically connect with the interposer, and the embodiment of the present application does not limit the shape, size and material of the bus bar 120, for example, it may be metal, alloy, etc.

Referring to fig. 1, in the example of fig. 1, the bus bar 120 is attached to the tab 110 at the end, in other words, a plurality of tabs 110 are stacked, and the bus bar 120 is attached to the tab 110 at the end after the stacking. The conductive medium is electrically connected to the bus bar 120.

As described above, the conductive medium is electrically connected to each tab 110, the conductive medium is electrically connected to the bus bar 120, and the current of the tab 110 may be transmitted to the bus bar 120 through the conductive medium.

Through the above connection manner, the current of each tab 110 can be converged to the bus bar 120, and in the using process, the bus bar 120 can be connected with the adaptor sheet and then connected with the electrode terminal, or the bus bar 120 takes the effect of the adaptor sheet into account and directly connects the bus bar 120 with the electrode terminal. Can converge the electric current of every utmost point ear 110 to piece 120 after the output that converges through the mode of this application, this mode has replaced the mode that the connection utmost point ear was welded in the switching, can not produce welding stress because the switching is bold in the manufacturing process to avoid dragging utmost point ear and lead to the cracked problem of utmost point ear.

Further, in some embodiments of the present application, in order to prevent the conductive medium from overflowing from the through hole 111, the tab assembly 100 further includes a cover 130, and the cover 130 is mainly used for covering the opening of the bus duct. In fig. 1, a cover 130 is used to cover the through-hole 111 of the tab 110 at the end. In other words, the cover 130 is coupled to the through-hole 111 exposed to the surface of the tab 110 and serves to cover the through-hole 111. In the present embodiment, one cover 130 covers one through hole 111. For embodiments in which the tab 110 has two or more through holes 111, one cover 130 may cover two or more through holes 111, or one cover 130 may cover all the through holes 111 exposed to the surface of the tab assembly 100.

The cover 130 is made of a metal material, and the shape and size of the cover 130 can be adapted to the through hole 111, or the shape and size of the cover 130 can be adapted to the shape and size of the through hole 111; alternatively, the shape of the cover 130 may be other shapes.

Further, in other embodiments of the present application, the cover 130 and the tab 110 may be connected by bonding, or the cover 130 may be adhered to the conductive medium to cover the through hole.

Alternatively, in other embodiments, the cover body 130 may be provided with a structure of an adhesive layer, and the adhesive layer of the cover body 130 is directly connected to the tab 110 for the purpose of covering the through hole.

Fig. 2 is a schematic cross-sectional view illustrating a further example of a tab assembly 100 provided in an embodiment of the present application, and referring to fig. 1 and 2, in fig. 2, a bus bar 120 is located between two adjacent tabs 110, in other words, two opposite surfaces of the bus bar 120 respectively abut against the two tabs 110.

Further, in the example of fig. 2, in order to avoid a large gap between the plurality of laminated tabs 110 and the bus bar 120, which results in an increase in resistance, the plurality of tabs 110 are connected to the bus bar 120 by a fixing member (not shown), in other words, the fixing member connects the plurality of tabs 110 and the bus bar 120 so as to avoid separation from each other. For example, the fastener may be a strap, a bolt, a screw, or the like. Alternatively, in some embodiments, for embodiments in which the conductive medium is a material with a relatively high viscosity, the fixing member may not be separately provided, and the conductive medium may also have the fixing function of the fixing member.

In the example shown in fig. 2, the through hole 111 of each tab 110 and the gap between two adjacent tabs 110 together form a bus duct 112, and the bus duct 112 is filled with a conductive medium, which is electrically connected to the bus bar 120; the bus bar 120 divides the bus passage 112 into two passages which are not communicated with each other, but the conductive medium in each passage is electrically connected with the bus bar 120, and the purpose that the current of each tab 110 is collected to the bus bar 120 can also be achieved. And in the example of fig. 2, the path length from the electric charges on the tabs 110 at the two side ends to the bus piece 120 is smaller, the impedance is smaller, and the current loss is reduced.

In the example shown in fig. 2, a cover 130 is used to cover the opening of the bus duct 112, for example, a plurality of tabs 110 are stacked, the tabs 110 at both ends each have a through hole 111 exposed to the surface, and the cover 130 covers the through holes 111 exposed to the surface. Illustratively, one cover 130 may cover one through hole 111, or one cover 130 may cover two, three or more through holes on one tab 110, or one cover 130 may cover all through holes 111 on one tab 110.

Further, in some embodiments of the present application, the fixing member may be integrally provided with the cover 130, in other words, the cover 130 covers the through hole 111 and also serves to fix the plurality of tabs 110 and the bus bar 120. For example, the cover 130 is integrally provided with the fixing member as a band which binds the plurality of tabs 110 and the bus bar 120 and covers the through-hole 111.

It should be noted that, in the examples of fig. 1 and fig. 2, the application does not limit the number of the tabs 110, and the number of the tabs 110 may be, for example, two, three, four, or more; in the example of fig. 2, the bus bar 120 may be attached to two tabs 110 located at an intermediate position, or may be located between two tabs 110 located at the remaining positions. Further, the tab assembly 100 may be a positive tab or a negative tab.

In the example shown in fig. 1 and 2, the distance between the axes of the through holes 111 of the adjacent two tabs 110 is 0-2 mm; for example, it may be 0.1mm, 0.5mm, 0.8mm, 1.1mm, 1.3mm, 1.6mm, 2mm, etc. The through holes 111 in each tab 110 extend in the same direction, and the axes of the through holes 111 in two adjacent tabs 110 may be collinear, or may be offset only slightly (e.g., 0-2mm) so that two adjacent through holes 111 overlap as much as possible.

The axes of the through holes 111 of each tab 110 are collinear, the length of the bus duct 112 is short, and the path of the electric charge through the conductive medium filled in the bus duct 112 is short, so that the impedance can be reduced.

It should be noted that, in other embodiments of the present application, the through hole 111 of each tab 110 may not be limited to the examples shown in fig. 1 and 2. In the embodiments of the present application, the bus duct 112 may have various forms. The form of the confluence passage 112 will be exemplified below.

Fig. 3 is a schematic structural view illustrating a first example of the bus duct 112, and referring to fig. 3, in the first example, the extending direction of the bus duct 112 is perpendicular to the overlapping direction of the plurality of tabs 110. The through holes 111 of each tab 110 are aligned with each other such that the axes of each through hole 111 are collinear. In the first example, the tab assembly 100 is provided with only one bus passage 112.

Fig. 4 shows a schematic structural view of a second example of the bus duct 112, and referring to fig. 4, in the second example, the tab assembly 100 is provided with only one bus duct 112. The extending direction of the bus duct 112 and the overlapping direction of the plurality of tabs 110 form an acute angle. Each of the through holes 111 in each of the tabs 110 may be only partially overlapped, and the two through holes 111 in the adjacent two tabs 110 communicate with each other.

Fig. 5 shows a schematic structure of a third example of the bus duct 112, please refer to fig. 5, in the third example, the tab assembly 100 is provided with only one bus duct 112, two through holes 111 on two adjacent tabs 110 do not coincide, and the two through holes 111 on two adjacent tabs 110 are communicated through a gap between the two adjacent tabs 110. The conductive medium fills the via hole 111 and the gap.

Fig. 6 shows a schematic structural diagram of a fourth example of the confluence passage 112, and referring to fig. 6, in the fourth example, the confluence passage 112 includes a main passage and a plurality of branch passages, and the plurality of branch passages are all communicated with the main passage.

It should be noted that, in other embodiments of the present application, the shape of the confluence passage 112 is not limited to the examples shown in fig. 3, 4, 5, and 6. The number of the confluence passages 112 is not limited to one, and may be two, three, or more. In the examples of fig. 3, 4, 5 and 6, the apertures of the through holes 111 located on each tab 110 are the same, and in other embodiments, the apertures of the through holes 111 located on each tab 110 may not be exactly the same.

Further, the examples shown in fig. 3, 4, 5 and 6 are applicable to the embodiment in which only one side of the organic support layer of the tab 110 is provided with the metal conductive layer, and also applicable to the embodiment in which both sides of the organic support layer of the tab 110 are provided with the metal conductive layers.

Fig. 7 is a schematic cross-sectional view illustrating another example of a tab assembly 100 according to an embodiment of the present application, and referring to fig. 7, in the example illustrated in fig. 7, a bus duct 112 is not provided in the tab assembly 100, that is, the through holes 111 in two adjacent tabs 110 are not communicated, and the two adjacent tabs 110 are tightly fitted to each other without providing the through holes 111.

Each through hole 111 is provided with a conductive medium, and the conductive medium is communicated with two adjacent metal conductive layers to electrically connect the two adjacent metal conductive layers.

For example, in an embodiment where only one side of the organic supporting layer of the tab 110 is provided with a metal conductive layer, the through hole 111 penetrates through the tab 110, and openings at two ends of the through hole 111 are respectively located on the surfaces of the two metal conductive layers, after the through hole 111 is filled with a conductive medium, the conductive medium electrically connects the two metal conductive layers, any two adjacent metal conductive layers are electrically connected under the action of the conductive medium, and there is no case where charges of the metal conductive layers cannot be converged to the bus bar 120.

The conductive medium in one through hole 111 transfers charges to the metal conductive layer, and then transfers the charges to the metal conductive layer through the metal conductive layer and the conductive medium in the other through hole 111, and finally transfers the charges to the bus bar 120 to achieve the purpose of bus bar.

For the embodiment in which the tab 110 is provided with metal conductive layers on both sides of the organic support layer, a through hole 111 penetrates through the tab 110, and the conductive medium in the through hole 111 is electrically connected to two adjacent metal conductive layers.

Further, in the example shown in fig. 7, the bus bar 120 is attached to the tab 110 at the end. It is understood that in other embodiments of the present application, the bus bar 120 may be attached to the tab 110 at the intermediate position.

As mentioned above, in the example shown in fig. 7, the tab assembly 100 may include the cover 130, the cover 130 covers the through holes 111 exposed on the surfaces of the tabs 110 after lamination, and accordingly, the number corresponding relationship between the cover 130 and the through holes 111 may be one-to-one or one-to-many, please refer to the description of the example shown in fig. 1 and fig. 2, which is not repeated herein.

The through holes 111 are filled with conductive media, the conductive media are communicated with the metal conductive layers, the two through holes 111 can be not communicated with each other, and charges are gathered to the confluence piece 120 through the conductive media and the metal conductive layers in the through holes 111.

As can be seen from the above, in the embodiment of the present application, the conductive medium penetrating through the organic supporting layer of the tab 110 is electrically connected to the metal conductive layer, and the conductive medium is electrically connected to the bus bar 120, so that the charges of the tab assembly 100 can be transferred to the bus bar 120 without using a hard material.

Referring to fig. 1-7, in the embodiment of the present application, the conductive medium is obtained by curing a conductive paste.

As an example, the composition of the conductive paste may be: conductive particles, an organic solvent, and a binder.

For example, the solvent is selected from butyl carbitol, butyl carbitol acetate, terpineol, diethylene glycol monoethyl ether acetate and diethyl phthalate, and the resin is selected from acrylic resins, ethyl cellulose and nitrocellulose. The conductive particles are one of platinum, gold, silver, copper, nickel and palladium. The binder may be styrene-butadiene rubber, for example. Alternatively, in some other embodiments of the present application, the conductive paste may be a commercially available product.

The conductive medium is obtained by curing conductive paste, and the conductive paste can better fill the through hole 111 and reduce the impedance. Further, during the curing process of the conductive paste, the tab 110 and the bus bar 120 may be kept in a state of being attached. Is favorable for charge transmission.

In addition, for the embodiment in which the tab assembly 100 includes the bus duct, the conductive paste may fill the gap between two adjacent tabs 110, thereby better transferring charge. The conductive paste can also fill defects caused in the process of preparing the through holes 111 by the tabs 110, fill the defects in the process of infiltrating the conductive paste, realize the conductive effect, reduce the processing requirements on the through holes 111, and reduce the process difficulty and the production cost. Meanwhile, the impedance of the battery cell is reduced, and the performance of the battery cell is improved.

It is understood that in other embodiments of the present application, the conductive medium is not limited to being formed by curing the conductive paste, and may be formed by filling conductive particles containing a binder directly.

The tab assembly 100 provided by the embodiment of the application has at least the following advantages:

conductive medium is connected with two adjacent metal conducting layers, and piece 120 that converges is connected with conductive medium electricity, makes every utmost point ear 110's electric charge homoenergetic transmit to piece 120 that converges through conductive medium and metal conducting layer, and the connected mode of this application can replace the mode that the switching han connects a plurality of utmost point ears 110, can avoid tearing utmost point ear 110 because of the welding stress that the welding produced.

Further, for the embodiment in which the conductive medium is formed after the conductive paste is cured, the wetting property of the conductive paste can make up for the defect caused by the preparation of the through hole 111, the requirement on the preparation precision of the through hole 111 is not high, the process difficulty and the production cost are reduced, and the cell impedance is also reduced.

The present application illustrates a method for manufacturing the tab assembly 100, which includes:

a through hole 111 is provided on each tab 110; overlapping the plurality of tabs 110; it should be noted that, the two processes of overlapping the plurality of tabs 110 and providing the through hole 111 on each tab 110 are not in sequence. In other words, a plurality of tabs 110 may be overlapped, and then through holes 111 are formed in the overlapped tabs 110, for example, coaxial through holes 111 are formed by punching; alternatively, the through hole 111 may be formed in each tab 110, and then the tabs 110 may be stacked.

The bus bar 120 is attached to the tab 110 positioned at the end portion, the conductive paste is filled in the through hole 111, and then the conductive paste is cured.

It should be noted that the above-mentioned manufacturing method is only a manufacturing method illustrating a part of the tab assembly 100.

The preparation method has simple preparation steps, and can replace a mode of switching a titanium.

For example, the tab assembly 100 may be manufactured by:

each tab 110 is provided with a through hole 111, each through hole 111 is filled with conductive paste and cured, each tab 110 is stacked, and after the tab 110 is attached to the bus bar 120, the tab 110 and the bus bar 120 are bound using a fixing member.

The application also provides a battery cell, which comprises a positive pole piece, a negative pole piece and a diaphragm for separating the positive pole piece and the negative pole piece;

the positive pole piece is provided with tab assembly 100 and the negative pole piece is provided with tab assembly 100.

The battery cell provided by the embodiment of the application uses the tab assembly 100, and has the advantages of the tab assembly 100.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tab assembly, comprising:

a bus bar; and

2. The tab assembly as claimed in claim 1, wherein the through hole of each tab and the gap between two adjacent tabs together form a bus channel; and the gap is also filled with a conductive medium.

3. The tab assembly as claimed in claim 2, wherein the tab assembly is provided with a plurality of the bus channels.

4. The tab assembly as claimed in claim 1, further comprising a cover for covering the through-holes of the tabs at the ends.

5. The tab assembly of claim 1 wherein the bus bar engages the tab in an end position.

6. The tab assembly of claim 1 wherein the bus bar is located between any adjacent two of the tabs, and a plurality of the tabs are connected to the bus bar by fasteners.

7. The tab assembly as claimed in any one of claims 1 to 6, wherein the distance between the axes of the through holes of adjacent two tabs is 0-2 mm.

8. The tab assembly as claimed in any one of claims 1-6, wherein the conductive medium fills the through-hole.

9. The tab assembly as claimed in any one of claims 1-6, wherein the conductive medium is obtained by curing a conductive paste.

10. An electrical core, comprising a positive electrode plate, a negative electrode plate, and a separator for separating the positive electrode plate and the negative electrode plate;

the positive pole piece is provided with a pole lug assembly according to any one of claims 1 to 9;

and/or the negative pole piece is provided with the pole lug assembly of any one of claims 1-9.