CN113964369A

CN113964369A - Battery cell and battery

Info

Publication number: CN113964369A
Application number: CN202111305300.7A
Authority: CN
Inventors: 郭飞; 邹浒; 翟新华; 张佳雨; 全小林; 白燕
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-01-21
Anticipated expiration: 2041-11-05
Also published as: CN113964369B

Abstract

The invention provides a battery cell and a battery, wherein the battery cell comprises an electrode plate and an insulating layer, the insulating layer comprises a base layer and a glue layer, the glue layer is arranged on the base layer, the base layer is fixedly connected with the electrode plate through the glue layer, and a plurality of through holes are formed in the base layer. Through providing an electric core including the insulating layer, and the insulating layer includes basic unit and glue film, the glue film sets up in the basic unit, the basic unit passes through the glue film and sets up on the electrode plate, thereby, make the insulating layer fix on the electrode plate, in order to fix and support the electrode slice, still be provided with a plurality of through-holes in the basic unit, pour into electrolyte and to electric core encapsulation back, electrolyte can circulate through a plurality of through-holes that still set up in the basic unit, reduce electrolyte and gather and lead to the condition of swell, thereby the stability of battery has been improved.

Description

Battery cell and battery

Technical Field

The invention relates to the technical field of batteries, in particular to a battery core and a battery.

Background

With the increasing requirements of the battery industry on energy density and safety performance, it is very important to improve the safety performance of the battery core under the use requirement of high energy density. The effect of insulating layer is fixed, insulating and protection to the naked electric core that the equipment was accomplished, therefore this sticky tape all has certain requirement to fire resistance, high temperature resistance, resistant electrolyte corrosivity and stability etc. however, under high voltage electrochemistry system, current insulating layer has the problem that loses efficacy easily, for example, the viscidity, electrolyte gathering lead to bulging etc..

It can be seen that the prior art has the problem of poor stability.

Disclosure of Invention

The embodiment of the invention provides a battery core and a battery, and aims to solve the problem of poor battery stability in the prior art.

The embodiment of the invention provides a battery cell, which comprises an electrode plate and an insulating layer, wherein the insulating layer comprises a base layer and a glue layer, the glue layer is arranged on the base layer, the base layer is fixedly connected with the electrode plate through the glue layer, and a plurality of through holes are formed in the base layer.

Optionally, the base layer comprises at least one of polypropylene PP and polyethylene PE material.

Optionally, the plurality of through holes are distributed in an array on the base layer.

Optionally, the subbing layer comprises an acrylic or styrene-isoprene-styrene (SIS) material.

Optionally, the electrode sheet includes a current collector and a paste coating layer, at least a partial region of the current collector is coated with the paste coating layer, and one part of the insulating layer is disposed on the paste coating layer, and the other part of the insulating layer is disposed on the current collector.

Optionally, the electrode plate comprises a positive electrode plate and a negative electrode plate, the insulating layer comprises a first sub adhesive tape and a second sub adhesive tape, the positive electrode plate is provided with the first sub adhesive tape, and the negative electrode plate is provided with the second sub adhesive tape.

Optionally, the insulating layer further includes a third sub-adhesive tape, a first tab is disposed on the positive electrode tab, a second tab is disposed on the negative electrode tab, and the third sub-adhesive tape is disposed on the first tab and the second tab respectively.

Optionally, the plurality of through holes have a porosity between 5% and 50%.

The embodiment of the invention also provides a battery, which comprises the battery core.

In the embodiment of the invention, the battery cell comprising the insulating layer is provided, the insulating layer comprises the base layer and the glue layer, the glue layer is laid on the base layer, and the base layer is arranged on the electrode plate through the glue layer, so that the insulating layer is fixed on the electrode plate to fix and support the electrode plate, the base layer is also provided with the plurality of through holes, after electrolyte is injected and the battery cell is encapsulated, the electrolyte can circulate through the plurality of through holes arranged on the base layer, the situation of swelling caused by accumulation of the electrolyte is reduced, and the stability of the battery is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

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

FIG. 2 is a structural diagram of an insulating layer provided by an embodiment of the present invention;

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

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

fig. 5 is a fourth schematic structural diagram of a battery cell provided in an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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 invention.

The terms first, second and the like in the description and in the claims of the present invention are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the structures so used are interchangeable under appropriate circumstances such that embodiments of the invention may be practiced in sequences other than those illustrated or described herein, and that the terms "first", "second", etc. are generally used herein as a class and do not limit the number of terms, for example, a first term can be one or more than one.

The embodiment of the invention provides a battery cell, as shown in fig. 1 to 5, which comprises an electrode plate 1 and an insulating layer 2, wherein the insulating layer 2 comprises a base layer 21 and an adhesive layer 22, the adhesive layer 22 is arranged on the base layer 21, the base layer 21 is fixedly connected with the electrode plate 1 through the adhesive layer 22, and a plurality of through holes are formed in the base layer 21.

In this embodiment, through providing a battery core including insulating layer 2, and insulating layer 2 includes basic unit 21 and glue film 22, glue film 22 can lay on basic unit 21, basic unit 21 passes through glue film 22 and sets up on electrode slice 1, thereby, make insulating layer 2 fix on electrode slice 1, in order to fix and support electrode slice 1, still be provided with a plurality of through-holes on basic unit 21, pour into electrolyte and to electric core encapsulation back, electrolyte can circulate through a plurality of through-holes that still set up on basic unit 21, reduce electrolyte and gather and lead to the condition of swell, thereby the stability of battery has been improved.

Alternatively, the base layer 21 may include at least one of polypropylene PP and polyethylene PE materials.

The base layer 21 is porous, and may be made of a polymer material including but not limited to PP, PE, or a composite material of the two, so that the base layer 21 can be soaked by the electrolyte to conduct the electrolyte.

Alternatively, the base layer 21 may be formed by extrusion coating.

In this embodiment, the PP, PE or a composite material thereof may be melted and extruded to form a thin film, i.e., the base layer 21; then annealing treatment is carried out to increase the size and the number of the thin film flaky crystal regions; and mechanically stretching to form a plurality of through holes in the substrate 21, wherein the through holes may be irregular in shape and have a porosity of 5% to 50% in the thickness direction of the substrate 21.

In another embodiment, the PP, PE or a composite material of the PP and PE may be first melted, extruded through an outlet of a melten gel die, assisted by an air knife, sufficiently contacted with a cooling roller to be cooled, and taken up by a subsequent roller set to form a film coil, i.e., to wind the substrate 21; the base layer 21 may then be perforated using a hole punch, the area of a single through hole may be between 0.01 and 4 square millimeters, and the porosity of the plurality of through holes may be between 5% and 50%;

wherein, a plurality of through holes may be distributed in an array on the base layer 21. The wound base layer 21 is punched by the punching machine, the shape of the formed through holes is different according to the difference of the punching machine die, the shapes of the through holes include but are not limited to round, square, oval and the like, and the through holes penetrate through the thickness direction of the base material 21, so that the formed through holes are distributed on the base layer 21 in an array mode, the permeability of the base layer 21 is enhanced, and the stability of the battery is improved.

Alternatively, the adhesive layer 22 may include an acrylic acid or styrene-isoprene-styrene (SIS) material, and a prepared adhesive solution solvent (acrylic acid or SIS) is coated on the base layer 21 to form the adhesive layer 22 on the base layer 21, so that the insulating layer 2 is disposed on the electrode sheet 1 through the adhesive layer 22 to fix the electrode sheet 1; the adhesive strength of the adhesive layer 22 can be adjusted by adjusting the dosage of the adhesive solution solvent laid on the base layer 21, so that the insulating layer 2 can meet the fixing requirements of different positions on the electrode sheet 1.

Alternatively, the electrode sheet 1 includes a positive electrode sheet and a negative electrode sheet, the insulating layer 2 includes a first sub tape and a second sub tape, the positive electrode sheet may have the first sub tape, and the negative electrode sheet may have the second sub tape.

In the embodiment, a diaphragm is arranged between the positive plate and the negative plate to prevent the positive plate and the negative plate from being directly contacted to cause short circuit, and the positive plate and the negative plate are wound at intervals to form a winding core;

the first sub-adhesive tape may be disposed between the first surface of the separator and the positive electrode plate, and the first sub-adhesive tape may include a base layer 21 and an adhesive layer 22, and when assembling, the first sub-adhesive tape is firstly bonded to the positive electrode plate through the adhesive layer 22 to fix the positive electrode plate, and a winding process is performed; then, electrolyte is injected, and the plurality of through holes on the base layer 21 conduct the electrolyte near the positive plate, so that the conditions of swelling, poor appearance and poor performance caused by accumulation of the electrolyte at the positive plate are reduced, and the stability of the battery is improved;

the second sub tape may be disposed between the second surface of the separator and the negative electrode sheet, and the second sub tape may include a base layer 21 and a glue layer 22, and when assembling, the second sub tape is firstly bonded to the negative electrode sheet through the glue layer 22 to fix the negative electrode sheet, and a winding process is performed; then, electrolyte is injected, and the plurality of through holes on the base layer 21 conduct the electrolyte near the negative plate, so that the conditions of swelling, poor appearance and poor performance caused by accumulation of the electrolyte at the negative plate are reduced, and the stability of the battery is improved;

the first surface and the second surface may be two surfaces oppositely arranged on the diaphragm, the first surface faces to the area where the positive plate is located, and the second surface faces to the area where the negative plate is located, so as to separate the positive plate from the negative plate.

Optionally, the insulating layer 2 may further include a third sub-tape, the positive electrode tab may be provided with a first tab 111, the negative electrode tab may be provided with a second tab 112, and the first tab 111 and the second tab 112 are respectively provided with the third sub-tape;

the third sub-tape may be disposed between the first surface and/or the second surface of the separator and the first tab 111, and may include a base layer 21 and a glue layer 22, and when assembling, the third sub-tape is first bonded to the first tab 111 through the glue layer 22 to fix the first tab 111, and a winding process is performed; then, electrolyte is injected, and the plurality of through holes on the base layer 21 conduct the electrolyte near the first tab 111, so that the conditions of bulging, poor appearance and poor performance caused by accumulation of the electrolyte at the first tab 111 are reduced, and the stability of the battery is improved;

it should be noted that the third sub-tape may also be disposed between the first surface and/or the second surface of the separator and the second tab 112, and the same technical effect may also be achieved, and in order to avoid repetition, the description is not repeated herein.

Optionally, the electrode sheet 1 includes a current collector 11 and a paste coating layer 12, at least a partial region of the current collector 11 is coated with the paste coating layer 12, and one part of the insulating layer 2 is disposed on the paste coating layer 12, and the other part is disposed on the current collector 11.

The current collector 11 provides a passage for the flow of electrons, and lithium ions may be attached to the paste layer 12. In the case where the electrode sheet 1 includes the positive electrode sheet and the negative electrode sheet, the current collector 11 may include a first current collector and a second current collector, and the paste layer 12 may include a first paste layer and a second paste layer;

in this embodiment, an electrical core includes a positive plate, a negative plate, a diaphragm and an insulating layer 2, the positive plate includes a first current collector and a first paste coating layer, and the positive plate can be divided into a long coating layer surface and a short coating layer surface, the positive plate and the negative plate are wound at intervals, a pole piece at the outermost ring of the electrical core can be set as the positive plate, and the first current collector of the positive plate can be a winding tail end;

the insulating layer 2 comprises a first sub adhesive tape, a second sub adhesive tape and a third sub adhesive tape, the first sub adhesive tape can be arranged at the junction of a first coating area positioned on the outermost long coating surface of the tail part of the battery cell and a first current collector area, and/or at the junction of a first coating area positioned on the outermost short coating surface of the tail part of the battery cell and the first current collector area, the first sub adhesive tape comprises but is not limited to double-sided multilayer, the empty foil areas covered by the first sub adhesive tape are oppositely arranged, no second current collector is arranged in the middle, and the first sub adhesive tape is positioned at the bending part of the battery cell; the electric core can be a positive plate ending, and the tail part of the positive plate is empty and the redundant negative plate is half to two circles; when the first sub-adhesive tape is arranged at the junction of the first coating area and the first current collector area on the outermost circle long coating surface at the tail part of the battery cell, the first sub-adhesive tape covers the short coating by 0.1-25 mm; when the first sub-adhesive tape is arranged at the junction of the first coating area and the first current collector area on the shortest coating surface of the outermost ring at the tail part of the battery cell, the first sub-adhesive tape covers the long coating by 0.1-25 mm and is closer to the outside of the battery cell; the first sub-tape and the negative electrode tab may overlap. The first sub-adhesive tape covers the circular arc area and falls on the straight area; or the first sub-adhesive tape covers more than 50% of the arc area.

The negative plate comprises a second current collector and a second coating layer, the second coatings at the tail ends of two surfaces of the second current collector are flush and exceed the tail end of the coating of the positive plate in the horizontal direction, and the second sub-adhesive tape of the negative plate can be arranged at the position of the negative plate corresponding to the innermost circle of the positive plate, including but not limited to double-sided multiple paths;

the positive plate is positioned on the first tab 111 of the first current collector to the first coating layer, and/or the negative plate is positioned on the second tab 112 of the second current collector to the second coating layer, and a third sub-adhesive tape can be arranged on the second tab to the second coating layer, including but not limited to double-sided multi-pass;

thus, the situation that electrolyte accumulates at the positive plate, the negative plate, the first tab 111 and the second tab 112 to cause swelling, poor appearance and poor performance is reduced, and the stability of the battery is improved.

It should be noted that, according to actual needs, the insulating layer 2 is optionally disposed on the positive plate, and/or the negative plate, and/or the first tab 111, and/or the second tab 112, taking economic considerations into consideration; the arrangement positions of the insulating layer 2 include, but are not limited to, the positive plate, the negative plate, the first tab 111, and the second tab 112, and may also be other areas in the battery where the electrolyte is easily collected, which may also achieve the same technical effect, and in order to avoid repetition, details are not repeated here.

It should be noted that the implementation manner of the embodiment of the battery core is also applicable to the embodiment of the battery, and the same technical effect can be achieved, and details are not described herein.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus of embodiments of the present invention is not limited to performing functions in the order discussed, but may include performing functions in a substantially simultaneous manner or in a reverse order depending on the functionality involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides an electric core, its characterized in that includes electrode slice and insulating layer, the insulating layer includes basic unit and glue film, the glue film sets up in the basic unit, the basic unit passes through the glue film with electrode slice fixed connection, be provided with a plurality of through-holes in the basic unit.

2. The electrical core of claim 1, wherein the base layer comprises at least one of a polypropylene (PP) and a Polyethylene (PE) material.

3. The electrical core of claim 1, wherein the plurality of through holes are distributed in an array on the base layer.

4. The cell of claim 1, wherein the subbing layer comprises an acrylic or styrene-isoprene-styrene (SIS) material.

5. The battery cell of claim 1, wherein the electrode sheet comprises a current collector and a paste coating layer, wherein the paste coating layer is applied to at least a partial region of the current collector, and the insulating layer is partially disposed on the paste coating layer and partially disposed on the current collector.

6. The battery cell of claim 1, wherein the electrode sheet comprises a positive electrode sheet and a negative electrode sheet, the insulating layer comprises a first sub-tape and a second sub-tape, the positive electrode sheet is provided with the first sub-tape, and the negative electrode sheet is provided with the second sub-tape.

7. The battery cell of claim 6, wherein the insulating layer further comprises a third sub-adhesive tape, a first tab is disposed on the positive electrode tab, a second tab is disposed on the negative electrode tab, and the third sub-adhesive tape is disposed on the first tab and the second tab respectively.

8. The electrical core of claim 1, wherein the plurality of through-holes have a porosity of between 5% and 50%.

9. A battery comprising the cell of any one of claims 1 to 8.