CN219144428U - Battery cell - Google Patents

Abstract

The application discloses a battery, which comprises an electric core, wherein the electric core comprises a first pole piece; the first pole piece includes: a first current collector; the first tab assembly comprises a plurality of first tab units; the plurality of first tab units are arranged on the first current collector at intervals along the long axis direction of the first current collector; the tab connection assembly comprises an inner connector and an outer connector; the inner connector comprises a plurality of tab connection parts; the external connector is connected with the internal connector; the first lug units are respectively arranged between the adjacent lug connecting parts. The battery is provided with a tab connection assembly, wherein the tab connection assembly comprises a plurality of tab connection parts; when a plurality of first tab units are arranged between adjacent tab connecting portions, the number of the tab connecting portions is greatly improved, so that the contact points between the first tab units and the tab connecting portions made of metal materials are increased, the overall overcurrent capacity of the battery is remarkably improved, the current is distributed uniformly locally, and the temperature rise of the battery is low.

Description

Battery cell

Technical Field

The present application relates to the field of battery technology, and more particularly to a battery.

Background

Along with the continuous acceleration of life rhythm, people hope that the electronic product can finish charging in a shorter and more instantaneous time, increase the frequency of use, realize the better use experience to mobile communication equipment, therefore put forward higher demands to quick charge performance, long duration, low heating and the like of the battery. The multipolar ear process is an effective method for reducing battery impedance and increasing battery charging speed.

However, most of the batteries in the prior market adopt a direct welding or back welding mode, only a single metal sheet is used for welding with a plurality of tab units, contact points between the tab units and the metal sheet are few, polarization is large, heat dissipation is slow, battery impedance is large, the whole overcurrent capacity of the battery cannot be improved, and current is distributed unevenly locally, so that the temperature rise of the battery and the whole machine is still higher.

Disclosure of Invention

In view of this, this application provides a battery, and it has solved a plurality of first tab units and only welded with single metal, leads to the point of contact between first tab unit and the sheetmetal few, and the polarization is big, and the heat dissipation is slow, battery impedance is big, and the whole overcurrent capacity of battery can not be promoted, and the inhomogeneous problem of electric current local distribution.

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

a battery comprising a cell; the battery cell comprises a first pole piece; the first pole piece comprises:

a first current collector;

the first tab assembly comprises a plurality of first tab units; the plurality of first tab units are arranged on the first current collector at intervals along the long axis direction of the first current collector;

the tab assembly comprises an inner connector and an outer connector; the inner connector comprises a plurality of tab connection parts; the outer connector is connected with the inner connector;

the plurality of first tab units are respectively arranged between two adjacent tab connecting parts.

Optionally, in the above battery, an intermediate connecting piece is disposed between the inner connector and the outer connector.

Optionally, in the above battery, a tab adhesive is disposed on a surface of the intermediate connecting member.

Alternatively, in the above-described battery,

the number of the lug connection parts is N;

the number of the first tab units is M;

wherein M, N satisfies N.ltoreq.M+1.

Optionally, in the above battery, the plurality of first tab units are equally divided into N-1 groups; a group of first tab units are arranged between any two adjacent tab connecting parts.

Optionally, in the above battery, on a cross section perpendicular to a thickness direction of the battery cell, projections of the plurality of first tab units overlap.

Optionally, in the above battery, on a cross section perpendicular to a thickness direction of the battery cell, projections of the plurality of tab connection portions overlap, and projections of the tab connection portions overlap with projections of the first tab unit.

Alternatively, in the above-described battery,

the first pole piece comprises a plurality of laminated first pole piece segment layers;

at least one first pole piece segment layer is arranged between two adjacent first pole lug units at intervals.

Optionally, in the above battery, the first tab unit and the first current collector are integrally formed.

Alternatively, in the above-described battery,

the battery further includes a package enclosing the electrical core;

the inner connector is connected with the first tab assembly and is arranged in the package;

the external part passes out of the package

In the battery provided by the application, the tab connecting assembly is arranged, and the inner connector of the tab connecting assembly comprises at least two tab connecting parts; the lug connection part is made of metal; when a plurality of first tab units are arranged between the adjacent tab connecting parts, the number of the tab connecting parts is greatly improved, so that the contact points between the first tab units and the metal sheets are increased, the polarization is small, the heat dissipation is fast, and the battery impedance is small; the whole overcurrent capacity of the battery is obviously improved, and the current is uniformly distributed locally, so that the temperature rise of the battery and the whole machine with the battery is low.

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 structural view of a tab connection assembly of the present application;

FIG. 2 is a schematic structural view of the present application;

fig. 3 is a schematic structural diagram of another embodiment of the present application.

In fig. 1-3:

1-tab connection assembly, 2-tab assembly;

11-inner connector, 12-outer connector, 13-intermediate connector;

111-tab connection.

Detailed Description

The application provides a battery.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. 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. 1-3, embodiments of the present application provide a battery, including a cell; the battery cell comprises a first pole piece; the first pole piece comprises a first current collector, a first tab assembly 2 and a tab connection assembly 1. The first tab assembly 2 includes a plurality of first tab units; along the long axis direction of the first current collector, a plurality of first tab units are arranged on the first current collector at intervals. The tab connection assembly 1 includes an inner connector 11 and an outer connector 12. The inner joint 11 includes at least two tab connection parts 111; the tab connection parts 111 are made of sheet metal, and the tab connection parts 111 are arranged in parallel. The outer connector 12 is connected to the inner connector 11; the inner connector is made of metal and can be electrically connected to the inner connector 11.

The first electrode sheet may be a positive electrode sheet or a negative electrode sheet.

A clamping space is formed between the adjacent two pole ear connecting parts 111; the plurality of first tab units are divided into one group or a plurality of groups according to the number of the clamping spaces:

when the number of tab connection parts 111 is two, one clamping space is formed; the plurality of first tab units are integrally formed into a group; the plurality of first tab units are all arranged in the clamping space;

when the number of tab connection parts 111 is greater than two, a plurality of clamping spaces are formed; the corresponding plurality of first tab units are divided into a plurality of groups; each group of first tab units is clamped in one clamping space.

The material of the inner connector 11 and the outer connector 12 is any one of copper, nickel, or copper nickel plating; preferably, the material of the inner connector 11 and the outer connector 12 is copper nickel plating.

Connecting the plurality of first tab units together and/or the first tab units and the tab connecting portion 111 together by welding; wherein the welding process is any one of brazing, laser welding or ultrasonic welding.

When the welding process is brazing, the metal material used for brazing is nickel. As set up above, the metal material that can braze is plated on first utmost point ear unit surface, can promote the utmost point ear performance that first utmost point ear subassembly 2 includes current-carrying capacity, makes things convenient for first utmost point ear subassembly 2 and utmost point ear coupling assembling 1 to weld again.

The tab connection assembly 1 of the present application includes a plurality of tab connection parts 111, and the tab connection parts 111 are of a sheet metal structure; when a plurality of first tab units are connected between the adjacent tab connection parts 111, the number of the tab connection parts 111 is greatly increased, so that the contact points between the first tab units and the tab connection parts 111 with the metal sheet structure are increased, the polarization is small, the heat dissipation is fast, and the battery impedance is small; the overall overcurrent capacity of the battery is remarkably improved, and the current is distributed uniformly locally, so that the temperature rise of the battery and the whole machine with the tab connecting assembly 1 is low.

It should be further noted that the external connector 12 is used for connecting to an external circuit; the external member 12 further differentiates the current and improves the overcurrent capacity of the battery.

In certain embodiments of the present application, an intermediate connector 13 is provided between the inner connector 11 and the outer connector 12. The tab connection parts 111 in the inner connector 11 are connected in parallel and at intervals to one end of the intermediate connector 13, and the outer connector 12 is connected to the other end of the intermediate connector 13; as above, the tab connection portion 111 and the external connection member 12 protrude in opposite directions with respect to the intermediate connection member 13.

It should be noted that, the tab connection portion 111 and the external connection member 12 are connected to the intermediate connection member 13 through a welding process; wherein the welding process is laser welding or ultrasonic welding.

By arranging the middle connecting piece 13, the convenient connection between the plurality of tab connecting parts 111 and the external connecting piece 12 is realized; meanwhile, the intermediate connecting piece 13 can provide a connecting surface with enough size, so that arrangement and arrangement of the plurality of tab connecting parts 111 are ensured to be more orderly and clear.

In certain embodiments of the present application, the surface of the intermediate connection 13 is provided with tab glue;

the tab adhesive is any one of a sealant, a double-sided adhesive tape or a hot melt adhesive.

The tab is glued and is pasted the surface at intermediate junction 13, not only can increase the intensity of first tab unit, avoids the tab rupture to when being provided with the battery core encapsulation of tab coupling assembling 1 in the packing, the adhesive linkage heat-seal of tab glue and packing is in the same place, and the encapsulation is effectual, guarantees that tab and packing are sealed not to leak.

The package is an aluminum plastic film.

In certain embodiments of the present application, the number of tab connections 111 is N; the number of the first tab units is M; wherein M, N satisfies N.ltoreq.M+1.

It should be noted that a clamping space is formed between any two adjacent lug connection parts 111; the N tab connection parts 111 form N-1 clamping spaces.

When the number of tab connection parts 111 is two, one clamping space is formed; the plurality of first tab units are integrally formed into a group; the plurality of first tab units are all arranged in the clamping space;

when the number of tab connection parts 111 is greater than two, a plurality of clamping spaces are formed; the corresponding plurality of first tab units are divided into a plurality of groups; each group of first tab units is clamped in one clamping space.

Referring to fig. 2, when n=2, a clamping space is formed; all the first tab units are welded in the clamping space. As set forth above, the tab connection assembly is simple in structure, and can maximize the energy density of the battery while securing the increase of the contact point of the first tab unit with the tab connection portion 111.

Referring to fig. 3, when n=m+1, M clamping spaces are formed; by the arrangement, each first tab unit can be ensured to be independently clamped in one clamping space. As set up above, each first tab unit can be guaranteed to have more contact points with tab connecting portion 111, and then the whole overcurrent capacity of battery and the homogeneity of the local distribution of electric current have been guaranteed to the maximize.

It should be noted that, the number of the tab connection portions 111 is set according to the actual situation, so that the battery energy density is ensured, and the overall overcurrent capacity of the battery and the uniformity of the local current distribution are ensured as much as possible.

In certain embodiments of the present application, the plurality of first tab units are equally divided into N-1 groups; the N-1 group of first tab units are sequentially clamped between the adjacent tab connection portions 111.

N-1 clamping spaces are formed in the N tab connection parts 111; divide into N-1 group with first utmost point ear unit, can guarantee in every clamping space homoenergetic weld a set of first utmost point ear unit, every clamping space homoenergetic contact first utmost point ear unit, and then guarantee that every utmost point ear connecting portion 111 homoenergetic contacts with first utmost point ear unit, guaranteed that the contact point between first utmost point ear unit and the utmost point ear connecting portion 111 is as many as possible. The number of each group of first tab units is equal, the regularity of the structure can be ensured, and the processing and the manufacturing are more convenient and faster.

In some embodiments of the present application, the projections of the plurality of first tab units overlap on a cross section perpendicular to the thickness direction of the battery cell; the tab connection part 111 of the tab connection assembly 1 connects a plurality of first tab units together.

The battery cell includes a positive electrode sheet, a separator, and a negative electrode sheet, which are stacked. The positive electrode sheet and/or the negative electrode sheet are the first electrode sheet described above. The positive plate comprises a positive current collector and a positive lug assembly; the positive tab assembly includes a plurality of positive tab units. The negative plate comprises a negative current collector and a negative lug component; the negative ear assembly includes a plurality of negative ear cells.

The laminated positive plate, the diaphragm and the negative plate are processed into the battery cell by any one of winding, Z-shaped folding or pole piece stacking. The battery cell comprises a plurality of laminated positive plate segment layers and negative plate segment layers; on a cross section perpendicular to the thickness direction of the battery cell, projections of all positive electrode ear units overlap, and projections of all negative electrode ear units overlap. And the positive electrode lug unit is staggered with the negative electrode lug unit.

As set forth above, it is convenient to connect a plurality of positive electrode ear units together, and a plurality of negative electrode ear units together.

In some embodiments of the present application, the projections of the plurality of tab connection parts 111 overlap, and the projections of the tab connection parts 111 overlap with the projections of the first tab unit, on a cross section perpendicular to the thickness direction of the battery cell.

As set up above, can guarantee that tab connecting portion 111 is laminated completely with the first tab unit that contacts it, furthest has promoted the area of contact of first tab unit and tab connecting portion 111, has maximally promoted the heat dispersion of battery.

In certain embodiments of the present application, the first pole piece comprises a stack of multiple first pole piece segment layers; at least one first pole piece segment layer is arranged between two adjacent first pole lug units at intervals.

The projections of all positive electrode ear units overlap and the projections of all negative electrode ear units overlap on a section perpendicular to the thickness direction of the battery cell; at least one positive plate segment layer is arranged between two adjacent positive lug units at intervals; at least one negative electrode slice segment layer is arranged between two adjacent negative electrode ear units. By the arrangement, the gap between two adjacent first tab units can be increased, and then the heat dissipation performance of the battery can be improved.

Further, a positive plate segment layer is arranged between two adjacent positive lug units at intervals; a negative electrode slice segment layer is arranged between two adjacent negative electrode lug units. As the arrangement is adopted, more first tab units can be arranged while the heat dissipation performance of the battery is improved, and further the performances of quick charge and the like of the battery are guaranteed.

In certain embodiments of the present application, the first tab unit is integrally formed with the first current collector. The first tab unit is an empty foil area formed by cutting or cleaned of the current collector; the tab connection part 111 is welded to the above-mentioned empty foil region and is connected to an external circuit through the external connection member 12, further differentiating current and improving the overcurrent capability of the electrode assembly.

In certain embodiments of the present application, the battery further comprises a package that encapsulates the battery cell; the inner connector 11 is connected with the first tab assembly 2 and is placed in the package; the outer member 12 passes out of the package.

It should be noted that the battery further includes a connecting member. The connecting piece is arranged on the outer surface of the battery cell and used for connecting the packaging body and the battery cell.

The components, arrangements, etc. referred to in this application are meant to be illustrative examples only and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the drawings. These components, devices, may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. 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 terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "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 should also be noted that in the device of the present application, the components may be disassembled and/or assembled again. Such decomposition and/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.

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.

The foregoing description of the preferred embodiments of the present utility model is not intended to limit the utility model to the precise form disclosed, and any modifications, equivalents, and alternatives falling within the spirit and principles of the present utility model are intended to be included within the scope of the present utility model.

Claims (9)

1. A battery comprising a cell, wherein the cell comprises a first pole piece; the first pole piece comprises:

a first current collector;

the first tab assembly (2) comprises a plurality of first tab units; the plurality of first tab units are arranged on the first current collector at intervals along the long axis direction of the first current collector;

the tab connection assembly (1) comprises an inner connector (11) and an outer connector (12); the inner connector (11) comprises a plurality of tab connection parts (111); the outer connector (12) is connected to the inner connector (11);

the plurality of first tab units are respectively arranged between two adjacent tab connecting parts (111); an intermediate connecting piece (13) is arranged between the inner connecting piece (11) and the outer connecting piece (12).

2. The battery according to claim 1, characterized in that the surface of the intermediate connection member (13) is provided with tab glue.

3. The battery according to claim 1 or 2, wherein,

the number of the tab connection parts (111) is N;

the number of the first tab units is M;

wherein M, N satisfies N.ltoreq.M+1.

4. The battery of claim 3, wherein a plurality of the first tab units are equally divided into N-1 groups; a group of first tab units are arranged between any two adjacent tab connecting parts (111).

5. The battery according to claim 1, wherein projections of the plurality of first tab units overlap on a cross section perpendicular to a thickness direction of the battery cell.

6. The battery according to claim 5, wherein projections of the plurality of tab connection portions (111) overlap and projections of the tab connection portions (111) overlap with projections of the first tab unit on a cross section perpendicular to a thickness direction of the battery cell.

7. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the first pole piece comprises a plurality of laminated first pole piece segment layers;

at least one first pole piece segment layer is arranged between two adjacent first pole lug units at intervals.

8. The battery of claim 1, wherein the first tab unit is integrally formed with the first current collector.

9. The battery according to any one of claims 1 to 2 or 5 to 8,

the battery further includes a package enclosing the electrical core;

the inner connector (11) is connected with the first tab assembly (2) and is arranged in the package;

the outer connector (12) passes out of the package.

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