阅读说明：本技术 一种电池及电子产品 (Battery and electronic product ) 是由 张雨 单亚平 邹浒 于 2021-09-23 设计创作，主要内容包括：本发明提供了一种电池及电子产品,所述电池包括第一极片、第二极片以及设置在第一极片和第二极片之间的第一隔膜,第一极片和第二极片的极性相反,第一极片和第二极片上分别设置有第一极耳和第二极耳,第二极片包括第二隔膜、第二活性物质层和第二引流片；第二活性物质层连续设置在第一隔膜和第二隔膜之间,第二引流片的至少一端与第二活性物质层接触,且第二引流片的至少一侧表面未设置第二活性物质层,第二极耳设置在第二引流片未设置第二活性物质层的一侧表面。本发明通过在隔膜之间设置正极活性物质涂层和/或负极活性物质涂层,有利于降低卷芯单元的厚度,提升电池的能量密度。(The invention provides a battery and an electronic product, wherein the battery comprises a first pole piece, a second pole piece and a first diaphragm arranged between the first pole piece and the second pole piece, the polarities of the first pole piece and the second pole piece are opposite, a first tab and a second tab are respectively arranged on the first pole piece and the second pole piece, and the second pole piece comprises a second diaphragm, a second active substance layer and a second drainage piece; the second active material layer is continuously arranged between the first diaphragm and the second diaphragm, at least one end of the second drainage sheet is in contact with the second active material layer, the second active material layer is not arranged on at least one side surface of the second drainage sheet, and the second pole lug is arranged on one side surface of the second drainage sheet, on which the second active material layer is not arranged. According to the invention, the positive active material coating and/or the negative active material coating are/is arranged between the diaphragms, so that the thickness of the winding core unit is favorably reduced, and the energy density of the battery is improved.)

1. A battery is characterized by comprising a first pole piece, a second pole piece and a first diaphragm arranged between the first pole piece and the second pole piece, wherein the polarities of the first pole piece and the second pole piece are opposite, and a first tab and a second tab are respectively arranged on the first pole piece and the second pole piece;

the second active material layer is continuously arranged between the first diaphragm and the second diaphragm, at least one end of the second drainage sheet is in contact with the second active material layer, the second active material layer is not arranged on at least one side surface of the second drainage sheet, and the second electrode tab is arranged on one side surface of the second drainage sheet, on which the second active material layer is not arranged.

2. The battery of claim 1, wherein the first pole piece comprises a current collector and a first active material layer disposed on at least one side surface of the current collector, the first pole piece and the second pole piece are wound in a stacked manner to form the battery, and the first pole piece and the second pole piece are separated by the first separator or the second separator.

3. The battery according to claim 2, wherein the second separator is combined with a surface of one side of the second active material layer; and/or the first diaphragm is compounded on the other side surface of the second active material layer.

4. The battery according to any one of claims 1 to 3, wherein the second tab includes one of the second tabs, one end of the second tab is embedded in the second active material layer, neither of both side surfaces of the other end of the second tab is provided with the second active material layer, and the second tab is provided on one end of both side surfaces of the second tab is provided with neither of the second active material layers.

5. The battery of any of claims 1-3, wherein the second pole piece comprises a plurality of the second current-directing pieces; one end of at least one second drainage sheet is embedded in the second active material layer, and the second active material layer is not arranged on the surfaces of both sides of the other end of the second drainage sheet; and/or two ends of at least one second drainage sheet are respectively contacted with two second active material layers, and the second active material layers are not arranged on the surfaces of both sides of the second drainage sheet; at least one of the second pole ears is disposed on the second flow sheet.

6. The battery of claim 1, wherein the first pole piece comprises a first active material layer disposed continuously between the first separator and the second separator, the first pole piece and the second pole piece are wound in a stack to form the battery, and the first pole piece and the second pole piece are separated by the first separator or the second separator.

7. The battery of claim 6, wherein the first pole piece further comprises a first drainage sheet, at least one end of the first drainage sheet is in contact with the first active material layer, at least one side surface of the first drainage sheet is not provided with the first active material layer, and the first tab is arranged on the side surface of the first drainage sheet not provided with the first active material layer.

8. The battery according to claim 7,

the first drainage sheet comprises one first drainage sheet, one end of the first drainage sheet is embedded in the first active material layer, the first active material layer is not arranged on the surfaces of the two sides of the other end of the first drainage sheet, and the first tab is arranged on one end, on the surfaces of the two sides of the first drainage sheet, of the first active material layer;

the second drainage piece comprises one second drainage piece, one end of the second drainage piece is embedded in the second active material layer, the second active material layer is not arranged on the surfaces of the two sides of the other end of the second drainage piece, and the second pole lug is arranged on one end, on the surfaces of the two sides of the second drainage piece, of the second active material layer.

9. The battery according to claim 7,

the first drainage sheet comprises a plurality of first drainage sheets, wherein one end of at least one first drainage sheet is embedded in the first active material layer, and the first active material layer is not arranged on the surface of the two sides of the other end of the first drainage sheet; and/or two ends of at least one first drainage sheet are respectively contacted with two first active material layers, and the first active material layers are not arranged on the surfaces of both sides of the first drainage sheet; at least one first tab is arranged on the first drainage sheet;

the second drainage sheet comprises a plurality of second drainage sheets, wherein one end of at least one second drainage sheet is embedded in the second active material layer, and the second active material layer is not arranged on the surface of the two sides of the other end of the second drainage sheet; and/or two ends of at least one second drainage sheet are respectively contacted with two second active material layers, and the second active material layers are not arranged on the surfaces of both sides of the second drainage sheet; at least one of the second pole ears is disposed on the second flow sheet.

10. An electronic product comprising a battery according to any one of claims 1 to 9.

Technical Field

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

Background

With the development of science and technology, electronic products increasingly enter the aspects of people's lives, and the normal use of the electronic products cannot be separated from batteries, wherein lithium ion batteries are widely applied to electronic products in various fields because of the advantages of energy, environmental friendliness and the like.

The conventional positive plate comprises a positive current collector and a positive coating coated on the surface of the positive current collector, and the conventional negative plate comprises a negative current collector and a negative coating coated on the surface of the negative current collector. At present, in the manufacturing of a winding type lithium ion battery, after pole pieces are stacked together according to the order of a diaphragm, a negative pole piece, a diaphragm and a positive pole piece, a winding core is formed by winding from the head to the tail of the negative pole piece by taking the head of the negative pole piece as the center. However, the thickness of the winding core of the conventional lithium ion battery is still larger, and the energy density is smaller. With the development of light and thin electronic products, how to reduce the thickness of the lithium ion battery and improve the energy density of the lithium ion battery plays a crucial role in the development of the lithium ion battery.

Disclosure of Invention

The invention aims to solve the problems of larger thickness and smaller energy density of a winding core of the conventional lithium ion battery.

In order to solve the above problems, a first aspect of the present invention provides a battery, including a first pole piece, a second pole piece, and a first separator disposed between the first pole piece and the second pole piece, wherein polarities of the first pole piece and the second pole piece are opposite, and the first pole piece and the second pole piece are respectively provided with a first tab and a second tab, wherein the second pole piece includes a second separator, a second active material layer, and a second drainage piece;

the second active material layer is continuously arranged between the first diaphragm and the second diaphragm, at least one end of the second drainage sheet is in contact with the second active material layer, the second active material layer is not arranged on at least one side surface of the second drainage sheet, and the second electrode tab is arranged on one side surface of the second drainage sheet, on which the second active material layer is not arranged.

Further, the first pole piece comprises a current collector and a first active material layer arranged on at least one side surface of the current collector, the first pole piece and the second pole piece are stacked and wound to form the battery, and the first pole piece and the second pole piece are separated by the first diaphragm or the second diaphragm.

Further, the second membrane is compounded on one side surface of the second active material layer; and/or the first diaphragm is compounded on the other side surface of the second active material layer.

Further, the second pole piece comprises a second drainage piece, one end of the second drainage piece is embedded in the second active material layer, the second active material layer is not arranged on the surfaces of the two sides of the other end of the second drainage piece, and the second pole lug is arranged on one end, not provided with the second active material layer, of the surfaces of the two sides of the second drainage piece.

Further, the second pole piece includes a plurality of the second drainage pieces; one end of at least one second drainage sheet is embedded in the second active material layer, and the second active material layer is not arranged on the surfaces of both sides of the other end of the second drainage sheet; and/or two ends of at least one second drainage sheet are respectively contacted with two second active material layers, and the second active material layers are not arranged on the surfaces of both sides of the second drainage sheet; at least one of the second pole ears is disposed on the second flow sheet.

Further, the first pole piece comprises a first active material layer, the first active material layer is continuously arranged between the first diaphragm and the second diaphragm, the first pole piece and the second pole piece are stacked and wound to form the battery, and the first pole piece and the second pole piece are separated by the first diaphragm or the second diaphragm.

Further, the first pole piece further comprises a first drainage piece, at least one end of the first drainage piece is in contact with the first active material layer, the first active material layer is not arranged on at least one side surface of the first drainage piece, and the first tab is arranged on one side surface of the first drainage piece, on which the first active material layer is not arranged.

Further, the first drainage sheet comprises a first drainage sheet, one end of the first drainage sheet is embedded in the first active material layer, the first active material layer is not arranged on the surfaces of the two sides of the other end of the first drainage sheet, and the first tab is arranged on one end, not provided with the first active material layer, of the surfaces of the two sides of the first drainage sheet;

the second drainage piece comprises one second drainage piece, one end of the second drainage piece is embedded in the second active material layer, the second active material layer is not arranged on the surfaces of the two sides of the other end of the second drainage piece, and the second pole lug is arranged on one end, on the surfaces of the two sides of the second drainage piece, of the second active material layer.

The first drainage sheet comprises a plurality of first drainage sheets, wherein one end of at least one first drainage sheet is embedded in the first active material layer, and the first active material layer is not arranged on the surface of both sides of the other end of the first drainage sheet; and/or two ends of at least one first drainage sheet are respectively contacted with two first active material layers, and the first active material layers are not arranged on the surfaces of both sides of the first drainage sheet; at least one first tab is arranged on the first drainage sheet;

the second drainage sheet comprises a plurality of second drainage sheets, wherein one end of at least one second drainage sheet is embedded in the second active material layer, and the second active material layer is not arranged on the surface of the two sides of the other end of the second drainage sheet; and/or two ends of at least one second drainage sheet are respectively contacted with two second active material layers, and the second active material layers are not arranged on the surfaces of both sides of the second drainage sheet; at least one of the second pole ears is disposed on the second flow sheet.

The battery adopts the novel structure, the occupation ratio of a metal current collector in a winding core can be reduced, the amount of a single-layer diaphragm in the winding core is also reduced, on one hand, the thickness of the winding core unit can be reduced, the energy density of the battery is improved, on the other hand, burrs and metal scraps cut in the positive electrode active material layer and the negative electrode active material layer can be reduced, the K value is improved, the K value yield is improved, the use of metal materials can be reduced, and the cost is saved; according to the battery with the novel structure, the positive plate and the negative plate are overlapped and wound to form the winding core, so that the volume of the winding core is more miniaturized, and the energy density of the battery can be greatly improved.

The invention provides an electronic product, which comprises a battery, wherein the battery is the battery as described in any one of the above items.

The beneficial effects of the electronic product of the invention are the same as those of the battery, and are not described again here.

Drawings

Fig. 1 is a schematic view of an unwound core of a first structure according to embodiment 1 of the present invention;

FIG. 2 is a schematic view of the core of FIG. 1 after winding;

FIG. 3 is an unwound structural view of a fourth winding core according to example 4 of the present invention;

FIG. 4 is a schematic view of the core of FIG. 3 after winding;

FIG. 5 is an unwound structural view of a fifth construction of a core according to example 5 of the present invention;

FIG. 6 is a schematic view of the core of FIG. 5 after winding;

fig. 7 is a schematic view showing an unwound winding core of a sixth structure in example 6 of the present invention;

fig. 8 is a schematic view of the structure of the core of fig. 7 after winding.

Description of reference numerals:

1-a first drainage sheet; 2-positive electrode active material layer; 3-a first membrane; 4-a second membrane; 5-negative electrode active material layer; 6-positive tab; 7-negative electrode tab; 8-a second drainage sheet;

11-a first drainage sheet I; 12-a first drainage sheet II; 81-second drainage sheet I; 82-second drainage sheet II.

Detailed Description

The conventional positive plate comprises a positive current collector and a positive coating coated on the surface of the positive current collector, and the conventional negative plate comprises a negative current collector and a negative coating coated on the surface of the negative current collector. At present, in the manufacturing of a winding type lithium ion battery, after pole pieces are stacked together according to the order of a diaphragm, a negative pole piece, a diaphragm and a positive pole piece, a winding core is formed by winding from the head to the tail of the negative pole piece by taking the head of the negative pole piece as the center. However, the thickness of the winding core of the conventional lithium ion battery is still larger, and the energy density is smaller. With the development of light and thin electronic products, how to reduce the thickness of the lithium ion battery and improve the energy density of the lithium ion battery plays a crucial role in the development of the lithium ion battery.

In order to solve the above technical problems, embodiments of the present invention provide a battery and an electronic product, in which a continuous positive electrode active material layer and/or a continuous negative electrode active material layer are disposed between separators, so that the proportion of a metal current collector in a roll core can be reduced, the amount of a single-layer separator in the roll core can be reduced, the thickness of the roll core can be reduced, and the energy density of the roll core can be increased.

The technical solutions in the embodiments of the present application will be described in detail and clearly with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Further, in the description of the present invention, "at least one" means one or more unless specifically limited otherwise.

In the description of the embodiments of the present application, the description of the term "some preferred embodiments" means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one preferred embodiment or preferred example of the present invention. Throughout this specification, the schematic representations of the terms used above do not necessarily refer to the same implementation or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The invention provides a battery, which comprises a first pole piece and a second pole piece, wherein the first pole piece and the second pole piece are separated by a diaphragm, a first tab and a second tab are respectively arranged on a first ticket and the second pole piece, and the first pole piece, the second pole piece and the diaphragm are superposed and wound to form a winding core. The first pole piece and the second pole piece have opposite polarities, the first pole piece can be a positive pole piece or a negative pole piece, and the first tab can be a positive tab or a negative tab; correspondingly, the second pole piece is a negative pole piece or a positive pole piece, and the second pole lug is a negative pole lug or a positive pole lug. At least one of the first pole piece and the second pole piece is a novel pole piece. The novel pole piece comprises a second diaphragm and an active substance layer continuously arranged between the first diaphragm and the second diaphragm, wherein the continuous arrangement means that the active substance layer between the first diaphragm and the second diaphragm is continuous and does not have a current collector bearing the active substance layer, while the active substance layer between the first diaphragm and the second diaphragm of the traditional pole piece is discontinuous, the active substance layer is required to be coated on the upper surface and the lower surface of the current collector of the traditional pole piece, and the active substance layer also needs to be loaded on the current collector.

In order to further illustrate the present invention, the following examples are given to further illustrate the present invention.

Example 1

As shown in fig. 1, the present embodiment provides a battery of a first structure, which includes a positive electrode tab, a negative electrode tab, and a first separator 3 located between the positive electrode tab and the negative electrode tab; wherein, the positive plate is traditional pole piece, and the negative pole piece is novel pole piece, and also the positive plate includes the first drainage piece 1 as the anodal mass flow body to and set up anodal active material layer 2 on first drainage piece both sides surface. The negative electrode sheet includes a second separator 4 and a negative electrode active material layer 5 continuously provided between the first separator 3 and the second separator 4, and the second separator 4 of the present embodiment is compounded on one surface of the negative electrode active material layer 5. However, the first separator 3 and the second separator 4 are opposed to each other, and the first separator 3 and the second separator 4 are located between the positive electrode sheet and the negative electrode sheet and both serve to separate the positive electrode sheet and the negative electrode sheet, and the separator provided with the active material layer is the second separator 4, and accordingly, the other separator is the first separator 3. That is, the second separator 4 may be combined with one surface of the negative electrode active material layer 5 in this embodiment, but the first separator 3 may be combined with the other surface.

Referring to fig. 2, the negative electrode plate, the first diaphragm 3 and the positive electrode plate are stacked together and wound from the head end to the tail end, the head ends of the negative electrode plate and the positive electrode plate are located inside the winding core, and the first diaphragm 3 or the second diaphragm 4 is arranged between each positive electrode plate and each negative electrode plate after winding, so that the battery short circuit caused by contact of the two electrodes can be prevented.

The head end refers to the end where the winding of the positive plate and the negative plate starts in the process of winding the core, and the tail end refers to the end where the winding of the positive plate and the negative plate ends in the process of winding the core.

As shown in fig. 1-2, the battery further includes a positive tab 6, the first current-guiding plate 1 extends towards both ends, and a first double-sided empty foil area is formed at the head end of the first current-guiding plate 1 along the winding direction, a single-sided coating area and a second double-sided empty foil area are sequentially formed at the tail end of the first current-guiding plate 1, the positive tab 6 is disposed in the first double-sided empty foil area, and the positive tab 6 is located at the innermost layer of the winding core after winding. More specifically, the first drainage sheet 1 sequentially forms a first double-sided hollow foil region, a double-sided coating region, a single-sided coating region, and a second double-sided hollow foil region in a winding direction. From this, can make the skin of book core only be the first drainage piece 1 that the both sides all do not cover anodal active material layer 2 to reduce the thickness that two-layer anodal active material layer 2 of outmost of book core need occupy, and be close to the first drainage piece 1 that the outer book core only unilateral covers anodal active material layer 2, so that roll core reduces the thickness that one deck anodal active material layer 2 needs occupy, thereby can promote anodal active material layer 2's utilization ratio, and then be favorable to promoting the energy density of book core.

With reference to fig. 1-2, the battery further includes a negative tab 7, a second current-guiding sheet 8 is disposed at a winding head end of the negative tab, the second current-guiding sheet 8 is embedded between the second separator 4 and the negative active material layer 5, the second current-guiding sheet 8 extends towards two ends and forms a double-sided empty foil region at the head end of the second current-guiding sheet 8 along a winding direction, a tail end of the second current-guiding sheet 8 is disposed in the negative active material layer 5 and contacts with the negative active material layer 5 to form a double-sided coating region, the negative tab 7 is disposed in the double-sided empty foil region, the negative tab 7 is disposed between the second separator 4 and the second current-guiding sheet 8, and the negative tab 7 is located at an innermost layer of the winding core after winding. More specifically, the second drainage sheet 8 sequentially forms a double-sided empty foil region, a single-sided coating region, and a double-sided coating region in the winding direction. From this, can make the inlayer of book core only the second drainage piece 8 that the two sides all do not cover negative electrode active material layer 5 to make the book core reduce the thickness that two-layer negative electrode active material layer 5 need occupy, and the book core that is close to the inlayer only the second drainage piece 8 that the unilateral covered negative electrode active material layer 5, so that the thickness that the book core reduces one deck negative electrode active material layer 5 and needs to occupy, thereby can promote negative electrode active material layer 5's utilization ratio, and then be favorable to promoting the energy density of book core.

The first double-sided empty foil area, the second double-sided empty foil area and the double-sided empty foil area refer to areas where the opposite two surfaces of the first drainage sheet 1 or the second drainage sheet 8 are not covered with the positive electrode active material layer 2, and the two surfaces of the first double-sided empty foil area, the second double-sided empty foil area and the double-sided empty foil area may not be covered with any substance, but may be only covered with a membrane, and as long as the two surfaces are not covered with the positive electrode active material layer 2, the first double-sided empty foil area, the second double-sided empty foil area or the double-sided empty foil area can be referred to; the first double-sided coating region, the second double-sided coating region and the double-sided coating region refer to regions where both opposite sides of the first drainage sheet 1 or the second drainage sheet 8 are covered with the positive electrode active material layer 2; the one-sided coating region means that one of opposite sides of the first or second drainage sheet 1 or 8 is covered with the positive electrode active material layer 2, and the other side is not covered with any substance or is covered with only the separator. The definitions of the first double-sided empty foil region, the second double-sided empty foil region, the double-sided coating region and the single-sided coating region of the battery with the following structure are the same as the explanations herein, and the details are not repeated.

Except for the mode shown in fig. 1-2, the structure of the positive plate and the negative plate of the battery with the first structure can be exchanged, the negative plate is a traditional plate, the positive plate is a novel plate, namely, the negative active material layer 5 is arranged on the first drainage plate 1, the positive active material layer 2 is continuously arranged between the first diaphragm 3 and the second diaphragm 4, the positions of the positive lug 6 and the negative lug 7 are also exchanged, the rest arrangement is the same as that of the battery with the first structure shown in fig. 1-2, and the specific structure of the battery is not repeated in the embodiment.

Example 2

This embodiment provides a battery (not shown in the drawings) of a second structure, which includes a positive electrode tab and a negative electrode tab; wherein, positive plate is traditional pole piece, and the negative pole piece is novel pole piece, and also positive plate includes first drainage piece and sets up in the anodal active material layer on first drainage piece both sides surface, and the negative pole piece includes first diaphragm, second diaphragm and sets up the negative active material layer between first diaphragm and second diaphragm in succession, and the second diaphragm is compound at the side surface on negative active material layer, and first diaphragm is compound at the opposite side surface on negative active material layer. When the positive plate and the negative plate are wound in an overlapping mode, the first diaphragm and the second diaphragm separate the adjacent positive plate and the adjacent negative plate.

Negative pole piece and positive plate stack together and coil from the head end to the tail end, and the head end of negative pole piece and positive plate is located the inlayer of rolling up the core, through the book core after coiling, all is provided with first diaphragm or second diaphragm between each positive plate and each negative pole piece, can prevent from the contact of the two poles of the earth and lead to the battery short circuit from this.

The battery also comprises a positive tab, the first current-leading sheet extends towards two ends, a first double-side empty foil area is formed at the head end of the first current-leading sheet along the winding direction, a single-side empty foil area and a second double-side empty foil area are sequentially formed at the tail end of the first current-leading sheet, the positive tab is arranged in the first double-side empty foil area, and the positive tab is positioned on the innermost layer of the winding core after winding. More specifically, the first drainage sheet sequentially forms a first double-sided hollow foil region, a double-sided coating region, a single-sided coating region, and a second double-sided hollow foil region in a winding direction. From this, can make the skin of book core only be the first drainage piece that the positive active material layer was not covered on both sides to reduce the thickness that two-layer positive active material layer of outmost of book core need occupy, and be close to outer book core and only be the first drainage piece that the positive active material layer was covered to the unilateral, so that roll core reduction one deck positive active material layer need occupy, thereby can promote the utilization ratio of positive active material layer, and then be favorable to promoting the energy density of book core.

This battery still includes the negative pole ear, the coiling head end of negative pole piece is provided with second drainage piece, second drainage piece inlays to be established between second diaphragm and negative pole active material layer, and second drainage piece extends to both ends, and form two side empty foil district at the head end of second drainage piece along the coiling direction, the tail end setting of second drainage piece is in negative pole active material layer, contact with negative pole active material layer, form two side coating district, the negative pole ear sets up in two side empty foil districts, and the negative pole ear sets up between second diaphragm and second drainage piece, the negative pole ear is located the inlayer of rolling up the core after coiling. More specifically, the second drainage sheet sequentially forms a double-sided empty foil region, a single-sided coating region, and a double-sided coating region in the winding direction. From this, can make the inlayer of book core only the second drainage piece that the two sides all do not cover the negative pole active material layer to make the book core reduce the thickness that two-layer negative pole active material layer need occupy, and the book core that is close to the inlayer only the second drainage piece that the unilateral covers the negative pole active material layer, so that the thickness that the book core reduction one deck negative pole active material layer need occupy, thereby can promote the utilization ratio of negative pole active material layer, and then be favorable to promoting the energy density of book core.

The battery of second structure except as above shown mode, can also exchange the structure of positive plate and negative pole piece, the negative pole piece is traditional pole piece, the positive plate is novel pole piece, negative pole active material layer sets up on first drainage piece promptly, positive active material layer sets up in succession between first diaphragm 3 and second diaphragm 4, and the position of positive ear and negative pole ear also carries out the swap, remaining setting all is the same with the battery of second structure as above shown, this embodiment is no longer repeated its specific structure.

Example 3

This embodiment provides a battery (not shown in the drawings) of a third structure, which includes a positive electrode tab and a negative electrode tab; the positive plate and the negative plate are both novel plates, namely the positive plate comprises a positive active material layer which is continuously arranged between the first diaphragm and the second diaphragm, and the negative plate comprises a second diaphragm and a negative active material layer which is continuously arranged between the first diaphragm and the second diaphragm; specifically, a first separator is compounded on the surface of the positive electrode active material layer side, and a second separator is compounded on the surface of the negative electrode active material layer side. When the positive plate and the negative plate are wound in an overlapping mode, the first diaphragm and the second diaphragm separate the adjacent positive plate and the adjacent negative plate.

Negative pole piece and positive plate stack together and coil from the head end to the tail end, and the head end of negative pole piece and positive plate is located the inlayer of rolling up the core, through the book core after coiling, all is provided with first diaphragm or second diaphragm between each positive plate and each negative pole piece, can prevent from the contact of the two poles of the earth and lead to the battery short circuit from this.

This battery still includes anodal ear, still is provided with first drainage piece on the anodal piece, and first drainage piece is including setting up the first drainage piece I at the coiling head end of anodal piece, and first drainage piece I one end sets up in anodal active substance layer, the other end extends to the coiling head end of anodal piece and forms first two side empty foil district, and the anodal ear setting is in first two side empty foil districts, and the anodal ear of coiling back is located the inlayer of rolling up the core. The first drainage sheet also comprises a first drainage sheet II arranged at the winding tail end of the positive plate, a positive active material layer is arranged between the first diaphragm and the first drainage sheet II, the first drainage sheet II extends towards two ends, the head end of the first drainage sheet II is arranged in the positive active material layer and is contacted with the positive active material layer to form a double-side coating area, and the tail end of the first drainage sheet II forms a second double-side hollow foil area; more specifically, the first drainage sheet II sequentially forms a double-sided coating region, a single-sided coating region, and a second double-sided hollow foil region in the winding direction. From this, the outer first drainage piece II that all does not cover the anodal active material layer for the two sides of the outer core that rolls up is close to the first drainage piece II that the outer core that rolls up only covers the anodal active material layer of unilateral to reduce the thickness that the anodal active material layer of the outer of core needs to occupy, thereby can promote the utilization ratio on anodal active material layer, and then be favorable to promoting the energy density who rolls up the core.

This battery still includes the negative pole ear, the coiling head end of negative pole piece is provided with second drainage piece, second drainage piece inlays to be established between second diaphragm and negative pole active material layer, and second drainage piece extends to both ends, and follow the coiling direction in proper order and form two side empty foil district at the head end of second drainage piece, the tail end setting of second drainage piece is in negative pole active material layer, contact with negative pole active material layer, form two side coating districts, the negative pole ear sets up in two side empty foil districts, and the negative pole ear sets up between second diaphragm and second drainage piece, the negative pole ear is located the inlayer of rolling up the core after coiling. More specifically, the second drainage sheet sequentially forms a double-sided empty foil region, a single-sided coating region, and a double-sided coating region in the winding direction. From this, can make the inlayer of book core only the second drainage piece that the two sides all do not cover the negative pole active material layer to make the book core reduce the thickness that two-layer negative pole active material layer need occupy, and the book core that is close to the inlayer only the second drainage piece that the unilateral covers the negative pole active material layer, so that the thickness that the book core reduction one deck negative pole active material layer need occupy, thereby can promote the utilization ratio of negative pole active material layer, and then be favorable to promoting the energy density of book core.

In addition to the manner described above, the battery of the third structure may also have the structures of the positive electrode sheet and the negative electrode sheet interchanged, that is, the positive electrode sheet includes the positive electrode active material layer, the positive electrode active material layer is continuously disposed between the first separator and the second separator, and the negative electrode sheet includes the first separator and the negative electrode active material layer continuously disposed between the first separator and the second separator; specifically, the first separator is compounded on the surface of one side of the negative electrode active material layer, the second separator is compounded on the surface of one side of the positive electrode active material layer, and the rest of the settings are the same as those of the battery with the third structure, and details of the specific structure are not repeated in this embodiment.

Example 4

As shown in fig. 3, the present embodiment provides a battery of a fourth structure, which includes a positive electrode tab, a negative electrode tab, and a first separator 3 located between the positive electrode tab and the negative electrode tab; wherein, the positive plate is traditional pole piece, and the negative pole piece is novel pole piece, and the positive plate also includes the first drainage piece 1 as the anodal mass flow body to and set up anodal active material layer 2 on the surface of first drainage piece 1 both sides. The negative electrode sheet includes a second separator 4 and a negative electrode active material layer 5 continuously provided between the first separator 3 and the second separator 4, and the second separator 4 of the present embodiment is compounded on one surface of the negative electrode active material layer 5. However, the first separator 3 and the second separator 4 are opposed to each other, and the first separator 3 and the second separator 4 are located between the positive electrode sheet and the negative electrode sheet and both serve to separate the positive electrode sheet and the negative electrode sheet, and the separator provided with the active material layer is the second separator 4, and accordingly, the other separator is the first separator 3. That is, the second separator 4 may be combined with one surface of the negative electrode active material layer 5 in this embodiment, but the first separator 3 may be combined with the other surface.

With reference to fig. 4, the negative electrode sheet, the first separator 3 and the positive electrode sheet are stacked together and wound from the head end to the tail end, the head ends of the negative electrode sheet and the positive electrode sheet are located in the inner layer of the winding core, and the first separator 3 or the second separator 4 is arranged between each positive electrode sheet and each negative electrode sheet active material layer after winding, so that the battery short circuit caused by contact of the two electrodes can be prevented.

As shown in fig. 3 to 4, the battery further includes a positive electrode tab 6, the positive electrode active material layers 2 disposed on both side surfaces of the first current guiding sheet 1 are discontinuous in the winding direction, a first double-sided empty foil region having no positive electrode active material layer 2 disposed on both side surfaces is disposed in the middle of the first current guiding sheet 1, and the first drainage sheet 1 extends towards the tail end of the winding direction to form a single-side coating area and a second double-side hollow foil area in sequence, namely, the first current-guiding plate 1 sequentially forms a first double-sided coated region, a first double-sided empty foil region, a second double-sided coated region, a single-sided coated region and a second double-sided empty foil region along the winding direction, the positive tab 6 is disposed in the first double-sided empty foil region, and the positive lug 6 is positioned in the middle layer of the winding core after winding, the first double-side coating area arranged at the head end of the first drainage sheet 1 is positioned in the inner layer of the winding core, and the second double-side hollow foil area arranged at the tail end of the first drainage sheet 1 is positioned in the outermost layer of the winding core. From this, set up anodal ear 6 at the intermediate position of book core, and anodal ear 6's both ends all contact with two-layer anodal active material layer 2 through first drainage piece 1, be favorable to shortening active ion's propagation path, reduce the resistance of book core, increase the capacity of battery, and the outmost first drainage piece 1 that the core was rolled up all not covered anodal active material layer 2 in both sides only, with the thickness that two-layer anodal active material layer 2 of outmost that reduces roll core need occupy, and be close to outer book core and only the first drainage piece 1 that unilateral covered anodal active material layer 2, so that roll core reduces the thickness that one deck anodal active material layer 2 needs occupy, thereby can promote the utilization ratio of anodal active material layer, and then be favorable to promoting the energy density of book core.

As shown in fig. 3 to 4, the battery further includes a negative electrode tab 7, a second current guiding sheet 8 is disposed on the negative electrode sheet, the second current guiding sheet 8 includes a second current guiding sheet II 82 disposed in the middle of the winding of the negative electrode sheet, both side surfaces of the second current guiding sheet II 82 are not coated with the negative electrode active material layer 5, the negative electrode tab 7 is disposed in the second current guiding sheet II 82 in the middle of the winding, the negative electrode tab 7 is disposed on one side surface of the second current guiding sheet II 82, which may be disposed between the second separator 4 and the second current guiding sheet II 82, or may be disposed on one side of the second current guiding sheet II 82 away from the second separator 4, and both ends of the second current guiding sheet II 82 in the middle of the winding are disposed in the negative electrode active material layer 5 and are in contact with the negative electrode active material layer 5, whereby the negative electrode tab 7 is disposed in the middle of the winding core, and both ends of the negative electrode tab 7 are in contact with the negative electrode active material layer 5 through the second current guiding sheet II 82, the method is beneficial to shortening the propagation path of active ions, reducing the resistance of the winding core and increasing the capacity of the battery. The second current-guiding sheet 8 further includes a second current-guiding sheet I81 disposed at a winding head end of the negative electrode sheet, the second current-guiding sheet I81 is disposed between the second separator 4 and the negative electrode active material layer 5, and the second current-guiding sheet I81 extends toward both ends and forms a double-sided empty foil region at the head end of the second current-guiding sheet I81 in the winding direction in sequence, and a tail end of the second current-guiding sheet I81 is disposed in the negative electrode active material layer 5 and contacts the negative electrode active material layer 5 to form a double-sided coating region, and more specifically, the second current-guiding sheet I81 forms a double-sided empty foil region, a single-sided coating region, and a double-sided coating region in the winding direction in sequence. From this, the inlayer of book core only is for covering second drainage piece I81 of second diaphragm 4, and the head end of the negative pole piece of being convenient for is rolled up, also can reduce the thickness that book core inlayer negative pole active material layer 5 need occupy to can promote the utilization ratio of negative pole active material layer 5, and then be favorable to promoting the energy density of book core.

The battery of the fourth structure can exchange the structures of the positive plate and the negative plate except the mode shown in fig. 3-4, the negative plate is a traditional plate, the positive plate is a novel plate, namely, the negative active material layer 5 is arranged on the first drainage plate 1, the positive active material layer 2 is continuously arranged between the first diaphragm 3 and the second diaphragm 4, the positions of the positive tab 6 and the negative tab 7 are also exchanged, the rest arrangement is the same as the battery of the fourth structure shown in fig. 3-4, and the specific structure is not repeated in the embodiment.

Example 5

As shown in fig. 5, the present embodiment provides a battery of a fifth structure, which includes a positive electrode tab and a negative electrode tab; wherein, positive plate is traditional pole piece, and the negative pole piece is novel pole piece, and also positive plate includes first drainage piece 1 and sets up in the anodal active material layer 2 on first drainage piece 1 both sides surface, and the negative pole piece includes first diaphragm 3, second diaphragm 4 and sets up the negative pole active material layer 5 between first diaphragm 3 and second diaphragm 4 in succession, and second diaphragm 4 is compound at the side surface on negative pole active material layer, and first diaphragm 3 is compound at the opposite side surface on negative pole active material layer. When the positive electrode sheet and the negative electrode sheet are wound in an overlapping manner, the first separator 3 and the second separator 4 separate the adjacent positive electrode sheet and the negative electrode sheet.

Referring to fig. 6, the negative electrode sheet and the positive electrode sheet are stacked together and wound from the head end to the tail end, the head ends of the negative electrode sheet and the positive electrode sheet are located on the inner layer of the winding core, and the first diaphragm 3 or the second diaphragm 4 is arranged between each positive electrode sheet and each negative electrode sheet after winding, so that the battery can be prevented from being short-circuited due to contact of the two electrodes.

As shown in fig. 5 to 6, the battery further includes a positive tab 6, the positive active material layers 2 disposed on the two side surfaces of the first current guiding sheet 1 are discontinuous in the winding direction, a first double-sided empty foil region having no positive active material layer 2 disposed on the two side surfaces is disposed in the middle of the first current guiding sheet 1, and the first current guiding sheet 1 extends to the tail end of the winding direction to sequentially form a single-sided coating region and a second double-sided empty foil region, that is, the first current guiding sheet 1 sequentially forms a first double-sided coating region, a first double-sided empty foil region, a second double-sided coating region, a single-sided coating region and a second double-sided empty foil region in the winding direction, the positive tab 6 is disposed in the first double-sided empty foil region between the first double-sided coating region and the second double-sided coating region, the positive tab 6 is located in the middle layer of the winding core after winding, the first double-sided coating region disposed at the head end of the first current guiding sheet 1 is located in the inner layer of the winding core, the second double-side hollow foil area arranged at the tail end of the first drainage sheet 1 is positioned at the outermost layer of the winding core. From this, set up anodal ear 6 at the intermediate position of book core, and anodal ear 6's both ends all contact with two-layer anodal active material layer 2 through first drainage piece 1, be favorable to shortening active ion's propagation path, reduce the resistance of book core, increase the capacity of battery, and the outmost first drainage piece 1 that the anodal active material layer 2 was all not covered on both sides of book core, thickness that two-layer anodal active material layer 2 that need occupy with the outmost two-layer anodal active material layer that reduces book core, and be close to outer book core and only be the first drainage piece 1 that unilateral covered anodal active material layer 2, so that it reduces the thickness that one deck anodal active material layer 2 needs to occupy to make roll core, thereby can promote anodal active material layer 2's utilization ratio, and then be favorable to promoting the energy density of book core.

As shown in fig. 5 to 6, the battery further includes a negative electrode tab 7, a second current guiding sheet 8 is disposed on the negative electrode sheet, the second current guiding sheet 8 includes a second current guiding sheet II 82 disposed in the middle of the winding of the negative electrode sheet, both side surfaces of the second current guiding sheet II 82 are not coated with the negative electrode active material layer 5, the negative electrode tab 7 is disposed in the second current guiding sheet II 82 in the middle of the winding, and the negative electrode tab 7 is disposed on one side surface of the second current guiding sheet II 82, which may be disposed between the second separator 4 and the second current guiding sheet II 82, or disposed on one side of the second current guiding sheet II 82 away from the second separator 4, and both ends of the second current guiding sheet II 82 in the middle of the winding are disposed in the negative electrode active material layer 5 and are in contact with the negative electrode active material layer 5, whereby the negative electrode tab 7 is disposed in the middle of the winding core, and both ends of the negative electrode tab 7 are in contact with the negative electrode active material layer 5 through the second current guiding sheet II 82, the method is beneficial to shortening the propagation path of active ions, reducing the resistance of the winding core and increasing the capacity of the battery. The second current-guiding sheet 8 further includes a second current-guiding sheet I81 disposed at the winding head end of the negative electrode sheet, and the second current-guiding sheet I81 extends toward both ends and forms a double-sided empty foil region at the head end of the second current-guiding sheet I81 in sequence along the winding direction, and the tail end of the second current-guiding sheet I81 is disposed in the negative electrode active material layer 5 and contacts with the negative electrode active material layer 5 to form a double-sided coating region, and more specifically, the second current-guiding sheet I81 forms a double-sided empty foil region, a single-sided coating region, and a double-sided coating region in sequence along the winding direction. From this, the inlayer of book core only is for covering second drainage piece I81 of second diaphragm 4, and the head end of the negative pole piece of being convenient for is rolled up, also can reduce the thickness that book core inlayer negative pole active material layer 5 need occupy to can promote the utilization ratio of negative pole active material layer 5, and then be favorable to promoting the energy density of book core.

The battery of the fifth structure can exchange the structures of the positive plate and the negative plate except the manner shown in fig. 5-6, the negative plate is a traditional plate, the positive plate is a novel plate, that is, the negative active material layer 5 is arranged on the first current-leading plate 1, the positive active material layer 2 is continuously arranged between the first diaphragm 3 and the second diaphragm 4, the positions of the positive tab 6 and the negative tab 7 are also exchanged, the rest arrangement is the same as the battery of the fifth structure shown in fig. 5-6, and the specific structure of the battery is not repeated in this embodiment.

Example 6

As shown in fig. 7, the present embodiment provides a battery of a sixth structure, which includes a positive electrode tab and a negative electrode tab; the positive plate and the negative plate are both novel plates, namely the positive plate comprises a positive active material layer 2, the positive active material layer 2 is continuously arranged between a first diaphragm 3 and a second diaphragm 4, and the negative plate comprises a second diaphragm 4 and a negative active material layer 5 continuously arranged between the first diaphragm 3 and the second diaphragm 4; specifically, the first separator 3 is compounded on the surface of the positive electrode active material layer 2 side, and the second separator 4 is compounded on the surface of the negative electrode active material layer 5 side. When the positive electrode sheet and the negative electrode sheet are wound in an overlapping manner, the first separator 3 and the second separator 4 separate the adjacent positive electrode sheet and the negative electrode sheet.

Referring to fig. 8, the negative electrode sheet and the positive electrode sheet are stacked together and wound from the head end to the tail end, the head ends of the negative electrode sheet and the positive electrode sheet are located on the inner layer of the winding core, and the first diaphragm 3 or the second diaphragm 4 is arranged between each positive electrode sheet and each negative electrode sheet after winding, so that the battery can be prevented from being short-circuited due to contact of the two electrodes.

As shown in fig. 7 to 8, the battery further includes a positive tab 6, a first current-guiding sheet 1 is disposed on the positive tab, the first current-guiding sheet 1 includes a first current-guiding sheet I11 disposed in the middle of the winding of the positive tab, the positive active material layer 2 is not coated on both surfaces of the first current-guiding sheet I11, the positive tab 6 is disposed in the first current-guiding sheet I11, and the positive tab 6 is disposed on one surface of the first current-guiding sheet I11, which may be disposed between the first separator 3 and the first current-guiding sheet I11, or disposed on one side of the first current-guiding sheet I11 away from the first separator 3, and both ends of the first current-guiding sheet I11 in the middle of the winding are disposed in the positive active material layer 2 and are in contact with the positive active material layer 2, so that the positive tab 6 is disposed in the middle of the winding core, and both ends of the positive tab 6 are in contact with the positive active material layer 2 through the first current-guiding sheet I11, the method is beneficial to shortening the propagation path of active ions, reducing the resistance of the winding core and increasing the capacity of the battery. The first drainage sheet 1 further comprises a first drainage sheet II 12 arranged at the winding tail end of the positive plate, a positive active material layer 2 is arranged between the first diaphragm 3 and the first drainage sheet II 12, the first drainage sheet II 12 extends towards two ends, the head end of the first drainage sheet II 12 is arranged in the positive active material layer 2 and is in contact with the positive active material layer 2 to form a double-side coated area, and a double-side empty foil area is formed at the tail end of the first drainage sheet II 12; more specifically, the first drainage sheet II 12 sequentially forms a double-sided coating region, a single-sided coating region, and a double-sided empty foil region in the winding direction. From this, the outer first drainage piece II 12 that the core was rolled up all not covered positive pole active material layer 2 for the both sides, and the core that is close to the outer core is the first drainage piece II 12 that the anodal active material layer 2 was covered to the unilateral to reduce the thickness that anodal active material layer 2 of the outer layer of core needs occupy, thereby can promote anodal active material layer 2's utilization ratio, and then be favorable to promoting the energy density of core.

As shown in fig. 7-8, the winding core further includes a negative electrode tab 7, a second current-guiding sheet 8 is disposed on the negative electrode sheet, the second current-guiding sheet 8 includes a second current-guiding sheet II 82 disposed in the middle of the winding of the negative electrode sheet, both side surfaces of the second current-guiding sheet II 82 are not coated with the negative electrode active material layer 5, the negative electrode tab 7 is disposed in the second current-guiding sheet II 82 in the middle of the winding, and the negative electrode tab 7 is disposed on one side surface of the second current-guiding sheet II 82, which may be disposed between the second separator 4 and the second current-guiding sheet II 82, or disposed on one side of the second current-guiding sheet II 82 away from the second separator 4, and both ends of the second current-guiding sheet II 82 in the middle of the winding are disposed in the negative electrode active material layer 5 and are in contact with the negative electrode active material layer 5, whereby the negative electrode tab 7 is disposed in the middle of the winding core, and both ends of the negative electrode tab 7 are in contact with the negative electrode active material layer 5 through the second current-guiding sheet II 82, the method is beneficial to shortening the propagation path of active ions, reducing the resistance of the winding core and increasing the capacity of the battery. The second current-guiding sheet 8 further includes a second current-guiding sheet I81 disposed at the winding head end of the negative electrode sheet, and the second current-guiding sheet I81 extends toward both ends and forms a double-sided empty foil region at the head end of the second current-guiding sheet I81 in sequence along the winding direction, and the tail end of the second current-guiding sheet I81 is disposed in the negative electrode active material layer 5 and contacts with the negative electrode active material layer 5 to form a double-sided coating region, and more specifically, the second current-guiding sheet I81 forms a double-sided empty foil region, a single-sided coating region, and a double-sided coating region in sequence along the winding direction. From this, the inlayer of book core only is for covering second drainage piece I81 of second diaphragm 4, and the head end of the negative pole piece of being convenient for is rolled up, also can reduce the thickness that book core inlayer negative pole active material layer 5 need occupy to can promote the utilization ratio of negative pole active material layer 5, and then be favorable to promoting the energy density of book core.

In addition to the embodiments shown in fig. 7 to 8, the battery of the sixth configuration may be configured such that the positive electrode sheet and the negative electrode sheet are interchangeable, that is, the positive electrode sheet includes a positive electrode active material layer, the positive electrode active material layer is continuously disposed between the first separator and the second separator, and the negative electrode sheet includes a first separator and a negative electrode active material layer continuously disposed between the first separator and the second separator; specifically, the first separator is compounded on the surface of one side of the negative electrode active material layer, the second separator is compounded on the surface of one side of the positive electrode active material layer, and the rest of the arrangements are the same as those of the battery with the sixth structure shown in fig. 7 to 8, and details of the structure of this embodiment are not repeated.

In the above embodiment, in any structure of the battery core, the first current guiding plate 1 and the second current guiding plate 8 are made of one or more metal foils such as aluminum foil, copper foil, nickel foil, gold foil, or platinum foil, preferably, the first current guiding plate 1 is made of aluminum foil, the second current guiding plate 8 is made of copper foil, the positive electrode tab 6 is also made of aluminum foil or copper foil, and correspondingly, the negative electrode tab 7 is made of copper foil or aluminum foil.

In the above embodiments, the tabs (including the positive tab and the negative tab) may be welded or bonded to the drainage sheet (including the first drainage sheet and the second drainage sheet), and the tabs may also be integrally connected to the drainage sheet, for example: when the drainage sheet is T-shaped or L-shaped, the pole ear and the drainage sheet are integrally connected.

In the above embodiment, there is only one positive tab 6 and one negative tab 7 in the battery, and accordingly, the number of the first current-guiding tabs 1 disposed on the positive tab does not exceed two, and the number of the second current-guiding tabs 8 disposed on the negative tab does not exceed two, but the embodiment of the present application also includes a multi-tab battery, that is, there are two or more positive tabs 6 and two or more negative tabs 7 in the battery, and those skilled in the art can set the number of the first current-guiding tabs 1 and the second current-guiding tabs 8 on the positive tab and the negative tab according to the number of the positive tabs 6 and the negative tabs 7; every anodal ear 6 all sets up on a first drainage piece 1, and every negative pole ear 7 all sets up on a second drainage piece 8, and anodal ear 6 and negative pole ear 7 can set up in the first section, middle part and the tail end of coiling direction.

In the above embodiments, the first diaphragm 3 and the second diaphragm 4 may be the same or different, and both the first diaphragm 3 and the second diaphragm 4 are film materials with better tensile strength and mechanical strength, such as: the first separator 3 and the second separator 4 are PET films or PE-ceramic composite films, which are not further limited in this application, and those skilled in the art can select them according to actual situations as long as the first separator 3 and the second separator 4 have better tensile strength and mechanical strength to support the positive electrode active material coating or the negative electrode active material coating.

In this embodiment, the battery further includes a casing, and the casing is used for encapsulating the battery cells with the above structures. The housing is not further limited in this embodiment, and those skilled in the art can select the housing according to actual situations, for example, the housing is an aluminum-plastic film housing.

The embodiment also provides an electronic product, which includes the battery as described above, and the electronic product can be various electronic products such as a mobile phone, a computer, a camera, and the like.

According to the battery provided by the invention, the continuous positive active material coating and/or negative active material layer is arranged between the diaphragms, the diaphragms can serve as carriers for loading the positive active material layer and the negative active material layer and can also play a role of separating the positive pole piece and the negative pole piece, so that the short circuit of the battery caused by the contact of the positive pole piece and the negative pole piece is prevented, the ratio of a metal current collector in a winding core can be reduced by adopting the battery with the novel structure, the amount of a single-layer diaphragm in the winding core is also reduced, on one hand, the thickness of the winding core unit can be reduced, the energy density of the battery is improved, on the other hand, burrs and metal scraps cut in the positive active material layer and the negative active material layer can be reduced, the K value is improved, the K value yield is improved, the use of metal materials can be reduced, and the cost is saved; according to the battery with the novel structure, the positive plate and the negative plate are overlapped and wound to form the winding core, so that the volume of the winding core is more miniaturized, and the energy density of the battery can be greatly improved. In addition, the winding core with the structure not only comprises a conventional winding mode (namely, the positive electrode lug and the negative electrode lug are wound in the winding core), but also comprises a winding mode (namely, the positive electrode lug and the negative electrode lug are arranged in the middle layer of the winding core) arranged in the electrode lugs, and the resistance value of the winding core can be further reduced by the winding core arranged in the electrode lugs, so that the capacity of the battery is increased.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.