CN214280151U

CN214280151U - Battery core and battery

Info

Publication number: CN214280151U
Application number: CN202120667867.8U
Authority: CN
Inventors: 余正发; 彭冲; 胡贤飞; 许延苹; 李俊义
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-09-24
Anticipated expiration: 2031-03-31

Abstract

The utility model provides an electricity core and battery. The battery cell comprises: first pole piece, second pole piece and diaphragm, first pole piece contains the first mass flow body and first active substance layer, the second pole piece contains the second mass flow body and second active substance layer, first pole piece with second pole piece polarity is opposite, just first pole piece with be provided with between the second pole piece the diaphragm, be provided with outstanding utmost point ear and welding utmost point ear on the first pole piece, outstanding utmost point ear with the welding utmost point ear electricity is connected. Therefore, the embodiment of the utility model provides a can reduce the disability rate of electric core.

Description

Battery core and battery

Technical Field

The utility model relates to a battery technology field, in particular to electricity core and battery.

Background

With the development of battery technology, batteries have been widely used in human life. Meanwhile, the kinds of batteries are increasing. In practical applications, utility model people find the following problems in the prior art: the connection strength of the tab of the first pole piece of the battery cell is poor, so that the rejection rate of the battery cell is high.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide an electric core, battery and electric core manufacturing method, the higher problem of disability rate of having solved electric core.

In order to achieve the above object, an embodiment of the present invention provides an electrical core, including: first pole piece, second pole piece and diaphragm, first pole piece contains the first mass flow body and sets up first active substance layer on the first mass flow body, the second pole piece contains the second mass flow body and sets up second active substance layer on the second mass flow body, first pole piece with second pole piece polarity is opposite, just first pole piece with be provided with between the second pole piece the diaphragm, be provided with outstanding utmost point ear and welding utmost point ear on the first pole piece, outstanding utmost point ear with the welding utmost point ear electricity is connected.

Optionally, the thickness of the welding tab is greater than the protruding tab.

Optionally, a projection of the welding tab in the cell thickness direction and a projection of the protruding tab in the cell thickness direction at least partially overlap.

Optionally, the battery cell is a winding battery cell, and the protruding tabs are respectively arranged on the multiple folds of the first pole piece.

Optionally, a winding head area of the first pole piece is provided with an empty foil area exposed out of the first current collector, and the welding tab is welded in the empty foil area.

Optionally, the battery cell is a laminated battery cell, the battery cell includes a plurality of the first pole pieces, and each of the first pole pieces is provided with at least one of the protruding tab and the welding tab.

Optionally, the hardness of the welding tab is greater than the hardness of the protruding tab.

Optionally, the protruding tab comprises a protruding tab extension portion extending out of the side edge of the first pole piece, the welding tab comprises a welding tab extension portion extending out of the side edge of the first pole piece, and the length of the welding tab extension portion is greater than that of the protruding tab extension portion.

Optionally, the thickness of welding utmost point ear is 20 ~ 500um, the thickness of outstanding utmost point ear is 5 ~ 20 um.

The embodiment of the utility model provides a still provide a battery, including foretell electric core.

In the embodiment of the utility model provides an in, electric core, include: first pole piece, second pole piece and diaphragm, first pole piece contains the first mass flow body and first active substance layer, the second pole piece contains the second mass flow body and second active substance layer, first pole piece with second pole piece polarity is opposite, just first pole piece with be provided with between the second pole piece the diaphragm, be provided with outstanding utmost point ear and welding utmost point ear on the first pole piece, outstanding utmost point ear with the welding utmost point ear electricity is connected. Therefore, the first pole piece is provided with the protruding pole lug and the welding pole lug, and the protruding pole lug is electrically connected with the welding pole lug, so that the connection strength of the first pole piece is enhanced, and the rejection rate of the battery cell is reduced.

Drawings

Fig. 1 is one of schematic structural diagrams of a battery cell according to an embodiment of the present invention;

fig. 2 is one of schematic structural diagrams of a first pole piece in a battery cell according to an embodiment of the present invention;

fig. 3 is a second schematic structural diagram of a first pole piece in a battery cell according to an embodiment of the present invention;

fig. 4 is a third schematic structural diagram of a first pole piece in a battery cell according to an embodiment of the present invention;

fig. 5 is a second schematic structural diagram of a battery cell according to an embodiment of the present invention;

fig. 6 is one of schematic structural diagrams of a second pole piece in a battery cell according to an embodiment of the present invention;

fig. 7 is a second schematic structural diagram of a second pole piece in a battery cell according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electrical core provided in an embodiment of the present invention, as shown in fig. 1, the electrical core includes: a first pole piece 10, a second pole piece 20 and a separator 30, referring to fig. 2 and 3, the first pole piece 10 includes a first current collector 11 and a first active material layer 12 disposed on the first current collector 11, referring to fig. 6 and 7, the second pole piece 20 includes a second current collector 21 and a second active material layer 22 disposed on the second current collector 21, the first pole piece 10 and the second pole piece 20 have opposite polarities, and the separator 30 is disposed between the first pole piece 10 and the second pole piece 20, referring to fig. 1 to 4, a protruding tab 1121 and a welding tab 1111 are disposed on the first pole piece 10, and the protruding tab 1121 and the welding tab 1111 are electrically connected.

Wherein, the utility model discloses the theory of operation of embodiment can see following expression:

because the first pole piece 10 is provided with the protruding tab 1121 and the welding tab 1111, the protruding tab 1121 is formed by a partial area of the first current collector 11 protruding the edge of the first pole piece 10, and can be obtained by die cutting through a die cutting process, and the welding tab 1111 is obtained by fixing the tab on the first pole piece 10 through a welding process. Like this, through setting up outstanding utmost point ear 1121 and welding utmost point ear 1111 on the first pole piece 10, and outstanding utmost point ear 1121 and welding utmost point ear 1111 electricity are connected to the joint strength of first pole piece 10 has been strengthened, has reduced the disability rate of electricity core. Therefore, the strength of the whole battery cell is enhanced, and the phenomenon that the battery cell is easy to disintegrate under the condition of being acted by external force is avoided.

In addition, the protruding tab 1121 may also be fixed to the first pole piece 10 by other processes, such as welding, so as to further enhance the connection strength between the protruding tab 1121 and the first pole piece 10, and further reduce the rejection rate of the battery cell. Of course, the protruding tab 1121 and the welding tab 1111 may also be connected by a welding process, so as to ensure a better electrical connection effect between the protruding tab 1121 and the welding tab 1111.

Meanwhile, since the cell structure in this embodiment is relatively stable, the occurrence of the phenomenon of breaking of the electrical connection between the protruding tab 1121 and the welding tab 1111 due to an external force can be reduced.

The separator 30 may include a substrate, which may be a Polyethylene (PE) monolayer film, a polypropylene (PP) monolayer film, or a polypropylene-polyethylene-polypropylene three-layer composite film, and a coating layer, which may include at least one of porous silica, alumina, titania, and zirconia.

Here, the first electrode sheet 10 may be referred to as a positive electrode sheet, the second electrode sheet 20 may be referred to as a negative electrode sheet, and accordingly, the first current collector 11 may be referred to as a positive electrode current collector, the first active material layer 12 may be referred to as a positive electrode active material layer, the second current collector 21 may be referred to as a negative electrode current collector, and the second active material layer 22 may be referred to as a negative electrode active material layer.

The first current collector 11 and the first active material layer 12 may enhance the conductive effect of the first pole piece 10. Similarly, the second current collector 21 and the second active material layer 22 may also enhance the conductive effect of the second electrode sheet 20.

Among them, the positive electrode collector may be made of an aluminum material, for example: the positive current collector may be made of aluminum foil, and the negative current collector may be made of copper material, for example: the negative current collector may be made of copper foil.

The materials for making the positive electrode active material layer and the negative electrode active material layer are not limited herein, and examples include: the positive electrode active material layer may include lithium cobaltate, lithium iron phosphate, manganese-rich lithium, etc., and the negative electrode active material layer may include graphite, hard carbon, silicon oxide, etc.

Of course, the first electrode sheet 10 may also be referred to as a negative electrode sheet, and the second electrode sheet 20 may also be referred to as a positive electrode sheet, and at this time, the polarities of the first current collector 11, the first active material layer 12, the second current collector 21, and the second active material layer 22 (i.e., the positive electrode or the negative electrode) may correspond to the polarities of the corresponding electrode sheets, and are not limited herein.

It should be noted that the protruding tab 1121 may be referred to as a first protruding tab, and the welding tab 1111 may be referred to as a first welding tab, as an alternative embodiment, referring to fig. 6 and fig. 7, the second tab 20 may also be provided with a second protruding tab 2121 and a second welding tab 2111, and corresponding descriptions of the second protruding tab 2121 and the second welding tab 2111 may refer to the corresponding descriptions of the first protruding tab and the first welding tab, which are not described herein again.

Optionally, the welding tab 1111 has a greater thickness than the protruding tab 1121. Like this, because the thickness of welding utmost point ear 1111 is thicker to make welding utmost point ear 1111 can be more stable welding on first pole piece 10, increased the joint strength between welding utmost point ear 1111 and the first pole piece 10, and make welding process to welding utmost point ear 1111 comparatively convenient, reduce welding process's of welding utmost point ear 1111 the degree of difficulty. In addition, the welding tab 1111 and the protruding tab 1121 may also be distinguished by the thickness of the tab.

Of course, as an alternative embodiment, the thickness of the welding tab 1111 and the thickness of the protruding tab 1121 may also be equal, so that the thickness of the tab is more uniform and convenient to manage.

Optionally, a projection of the welding tab 1111 in the cell thickness direction and a projection of the protruding tab 1121 in the cell thickness direction at least partially overlap. Therefore, due to the fact that the projections of the welding lug 1111 and the protruding lug 1121 in the thickness direction of the battery cell are at least partially overlapped, the distance between the welding lug 1111 and the protruding lug 1121 is shortened, the electric connection distance between the welding lug 1111 and the protruding lug 1121 is reduced, the electric connection difficulty is reduced, and meanwhile the cost of electric connection is saved.

Note that, the cell thickness direction in the present invention is understood as the a direction in fig. 4.

Optionally, referring to fig. 4, the battery cell is a winding battery cell, and the protruding tabs 1121 are respectively disposed on the multiple folds of the first pole piece 10.

Referring to fig. 5, each of the folded-over protruding tabs 1121 may be electrically connected with the welding tab 1111, and the protruding tabs 1121 may be electrically connected with the welding tab 1111 through an electrically conductive connection line. Of course, the lengths of the conductive connection lines are different when the positions of the protruding tabs 1121 are different.

The winding type battery cell can be formed by sequentially stacking and winding a first pole piece 10, a diaphragm 30 and a second pole piece 20, and the stacked first pole piece 10 forms a multi-fold structure in the thickness direction of the battery cell. The multi-fold structure may be understood as including a plurality of folds, and any two adjacent folds are connected, and two adjacent folds may be oppositely disposed, and each fold includes a three-layer structure of the first pole piece 10, the diaphragm 30 and the second pole piece 20.

In this way, since the plurality of bent portions of the first pole piece 10 are respectively provided with the protruding tabs 1121, the connection strength of the first pole piece 10 can be further enhanced, the connection strength of the whole battery cell is further enhanced, and the rejection rate of the battery cell is reduced.

Alternatively, referring to fig. 2, the winding head area of the first pole piece 10 is provided with a hollow foil area 111 exposing the first current collector 11, and the welding tab 1111 is welded to the hollow foil area 111. Therefore, the welding tab 1111 is located in the empty foil area 111, so that the welding of the welding tab 1111 is convenient, and the difficulty of welding processing is reduced.

Herein, the first current collector 11 may cover only a portion of the first pole piece 10, and an area of the first pole piece 10 not covered by the first current collector 11 may be referred to as an empty foil area 111. The winding head region is understood to be the end region of the first pole piece 10, which can be arranged close to the central region of the cell.

In addition, referring to fig. 2, the area of the first pole piece 10 other than the empty foil area 111 may be referred to as a first coated area 112, and correspondingly, referring to fig. 6, the second pole piece 20 may also be provided with the empty foil area 211 and a second coated area 212, while the second welding tab 2111 is located in the empty foil area 211, referring to fig. 7, and the second protruding tab 2121 is located in the second coated area 212.

Optionally, the battery cell is a laminated battery cell, the battery cell includes a plurality of the first pole pieces 10, and each of the first pole pieces 10 is provided with at least one of the protruding tab 1121 and the welding tab 1111.

The laminated cell can be understood as a stack of the first pole piece 10, the diaphragm 30 and the second pole piece 20.

Like this, because electric core can be coiling formula electric core or lamination formula electric core to the variety's of electric core and flexibility have been increased. Meanwhile, each first pole piece 10 is provided with at least one protruding tab 1121 and a welding tab 1111, so that the connection strength of the first pole piece 10 can be further enhanced, and the connection strength of the whole battery core is further enhanced.

Optionally, the hardness of the welding tab 1111 is greater than the hardness of the protruding tab 1121. In this way, the connection strength between the welding tab 1111 and the first pole piece 10 can be enhanced, and meanwhile, the hardness of the protruding tab 1121 is low, so that the processing difficulty is low when the protruding tab 1121 is subjected to die cutting.

Of course, the hardness of the welding tab 1111 may be equal to that of the protruding tab 1121, and is not limited thereto.

Optionally, the protruding tab 1121 includes a protruding tab extension extending out of the side of the first pole piece 10, and the welding tab 1111 includes a welding tab extension extending out of the side of the first pole piece 10, and the length of the welding tab extension is greater than the length of the protruding tab extension.

The protruding tab 1121 may further include a protruding tab body portion, and the welding tab 1111 may further include a welding tab body portion, where the protruding tab body portion and the welding tab body portion are both located on the first pole piece 10, and a projection on the first pole piece 10 overlaps with the first pole piece 10.

In addition, the protruding tab body part is connected with the protruding tab extension part, and the welding tab body part is connected with the welding tab extension part. The above two embodiments may be implemented simultaneously, or only one embodiment may be selected and implemented.

In this way, the connection strength between the protruding tab body portion and the protruding tab extension portion, and the connection strength between the welding tab body portion and the welding tab extension portion can be further enhanced by the above two embodiments. Meanwhile, the welding lug extension part can be connected with the conductive lead, and the connection strength of the welding lug extension part and the conductive lead is improved.

The utility model discloses in the embodiment, welding utmost point ear extension length is greater than outstanding utmost point ear extension length, and it is more convenient when can be so that welding utmost point ear extension is connected with outstanding utmost point ear extension, simultaneously, the length of welding utmost point ear extension is longer, and the length of outstanding utmost point ear extension is shorter, because welding process is comparatively convenient, and the requirement of carrying out cross cutting processing to outstanding utmost point ear is higher, consequently, can reduce the processing degree of difficulty, reduction processing cost.

Optionally, the thickness of the welding tab 1111 is 20 to 500um, and the thickness of the protruding tab 1121 is 5 to 20 um. Therefore, the connection strength of the welding tab 1111 and the protruding tab 1121 can be ensured to be better, the welding tab 1111 and the protruding tab 1121 can be processed conveniently, and the processing cost is reduced.

The embodiment of the utility model provides a still provide a battery, including foretell electric core. Because the embodiment of the present invention provides a battery including the electric core of above-mentioned embodiment, therefore have the same beneficial technical effect as the electric core in above-mentioned embodiment, and the concrete structure of electric core can refer to the corresponding expression in above-mentioned embodiment, and concrete no longer redundance here.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A cell, comprising: first pole piece, second pole piece and diaphragm, first pole piece contains the first mass flow body and sets up first active substance layer on the first mass flow body, the second pole piece contains the second mass flow body and sets up second active substance layer on the second mass flow body, first pole piece with second pole piece polarity is opposite, just first pole piece with be provided with between the second pole piece the diaphragm, its characterized in that, be provided with outstanding utmost point ear and welding utmost point ear on the first pole piece, outstanding utmost point ear with the welding utmost point ear electricity is connected.

2. The electrical core of claim 1, wherein the weld tab has a thickness greater than the protruding tab.

3. The cell of claim 1, wherein a projection of the welding tab in a cell thickness direction and a projection of the protruding tab in a cell thickness direction at least partially overlap.

4. The cell of claim 1, wherein the cell is a wound cell, and the protruding tabs are disposed on the plurality of folds of the first pole piece.

5. The cell of claim 4, wherein the winding head region of the first pole piece is provided with a hollow foil region exposing the first current collector, and the welding tab is welded in the hollow foil region.

6. The cell of claim 1, wherein the cell is a laminated cell comprising a plurality of the first pole pieces, each of the first pole pieces being provided with at least one of the protruding tab and the welding tab.

7. The electrical core of claim 1, wherein the hardness of the weld tab is greater than the hardness of the protruding tab.

8. The electrical core of claim 1, wherein the protruding tab comprises a protruding tab extension extending beyond the first pole piece side, and wherein the welding tab comprises a welding tab extension extending beyond the first pole piece side, the welding tab extension having a length greater than the protruding tab extension.

9. The battery cell of claim 1, wherein the thickness of the welding tab is 20-500 um, and the thickness of the protruding tab is 5-20 um.

10. A battery comprising the cell of any one of claims 1-9.