CN113508475A

CN113508475A - Battery cell, battery using battery cell and electronic device

Info

Publication number: CN113508475A
Application number: CN202180002386.8A
Authority: CN
Inventors: 王攀; 戴志芳; 刘慧君; 龙海
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2021-10-15

Abstract

The application discloses a battery cell, which comprises a first pole piece and a second pole piece, wherein the first pole piece comprises a first current collector and a first active layer, the first pole piece comprises a first end part, the first end part is arranged on the outer side of the battery cell, and the surface of the first current collector, which is positioned at the first end part, is provided with the first active layer; the first pole piece and the second pole piece are wound at intervals, and the first pole piece is arranged on the outermost circle of the battery cell; the battery cell comprises a first end face and a first cambered surface area connected with the first end face, wherein the first end portion is close to the first end face and is arranged in the first cambered surface area, the first end face is a point which is the most protruded point of an arc-shaped side face of a battery cell and extends along the thickness direction of the battery cell, and the first cambered surface area is a surface which is arranged in an arc shape on the side face of the battery cell. The embodiment of the application also provides a battery and an electronic device applying the battery core.

Description

Battery cell, battery using battery cell and electronic device

Technical Field

The application relates to the technical field of energy storage, in particular to an electric core, a battery using the electric core and an electronic device.

Background

In the prior art, in a general winding type battery, partial optical aluminum foils exist at the tail parts of the outer electrode plates of the battery core (namely, active substance coatings are not coated on the two surfaces of the foils) during the ending, and the optical aluminum foils are ended on the surface of the battery core, so that the energy density of the battery is low. How to provide a new cell structure to solve the above problems is considered by those skilled in the art.

Disclosure of Invention

The problem that the empty aluminum foil at the tail part of the battery cell occupies the volume of the battery cell so that the energy density of the battery cell is reduced in the prior art is solved. The embodiment of the application provides an electric core, which comprises a first pole piece and a second pole piece, wherein the first pole piece comprises a first current collector and a first active layer, the first pole piece comprises a first end part, the first end part is arranged on the outer side of the electric core, and the surface of the first current collector, which is positioned at the first end part, is provided with the first active layer; the first pole piece and the second pole piece are wound at intervals, and the first pole piece is arranged on the outermost circle of the battery cell; the battery cell structure comprises a first end face and a first cambered surface area connected with the first end face, wherein the first end portion is close to the first end face and is arranged in the first cambered surface area, the first end face is a face which contains the most prominent point of the arc-shaped side face of the battery cell and extends along the thickness direction of the battery cell, and the first cambered surface area is a face which is arranged in an arc shape on the side face of the battery cell. The embodiment of the application also provides a battery and an electronic device applying the battery core.

In an embodiment, the first active layer is disposed on a surface of the first current collector disposed at the outermost ring of the battery cell, the surface facing the inside of the battery cell, and the first active layer is not disposed on a surface of the first current collector disposed at the outermost side of the battery cell.

In an embodiment, the second pole piece includes a second current collector and a second active layer, the second pole piece includes a second end portion, the second end portion is close to the first end surface and is disposed in the first arc surface area, the second active layer is disposed on a surface of the second end portion of the second current collector, and a distance from the first end portion to the first end surface is greater than a distance from the second end portion to the first end surface.

In an embodiment, the battery cell further includes an insulating adhesive, the insulating adhesive includes a first sub-insulating adhesive and a second sub-insulating adhesive, the first current collector is disposed on the surface of the first arc surface area, the first sub-insulating adhesive is disposed on the surface of the first arc surface area, the second sub-insulating adhesive covers the first end portion and the second end portion, and the second sub-insulating adhesive is in contact with the first sub-insulating adhesive.

In an embodiment, the battery cell further includes a separation film disposed between the first pole piece and the second pole piece, and a distance from one end of the separation film to the first end surface is smaller than a distance from the second end to the first end surface.

In an embodiment, the first pole piece further includes a third end portion, the second pole piece further includes a fourth end portion, the third end portion and the fourth end portion are disposed in the battery cell, and the battery cell further includes tabs disposed in the third end portion and the fourth end portion.

In an embodiment, the first active layer is not disposed on the surface of the first current collector located at the third end, the second active layer is not disposed on the surface of the fourth end, the insulating paste further includes a third sub-insulating paste, and the third sub-insulating paste is disposed on the surface of the first current collector located at the third end.

In an embodiment, the battery cell further includes a tab, the first pole piece includes a first empty foil area, the second pole piece includes a second empty foil area, a first current collector located in the first empty foil area is not covered by the first active layer, a second current collector located in the second empty foil area is not covered by the second active layer, and the tab is disposed in the first empty foil area and the second empty foil area.

A battery comprises the battery core.

An electronic device comprises the battery.

Compared with the prior art, according to the battery cell disclosed by the application, on one hand, the pole piece at the outermost ring of the battery cell is the first pole piece ending of the single-side coating, and the design of a hollow foil area is avoided, so that the energy density of the lithium ion battery is improved, and the consumption of consumables is reduced; on the other hand, the first end part is arranged close to the first end face and arranged in the first cambered surface area, so that the space between the first cambered surface area and the plane where the first end face is located can be fully utilized, and the energy density is further improved.

Drawings

Fig. 1 is a schematic plan view of a battery cell according to a first embodiment of the present application.

Fig. 2 is a schematic cross-sectional structure diagram of a battery cell according to a first embodiment of the present application.

Fig. 3 is a schematic plan view of a battery cell according to a second embodiment of the present application.

Fig. 4 is a schematic cross-sectional structure diagram of a battery cell according to a second embodiment of the present application.

Fig. 5 is a schematic plan view of a battery according to a third embodiment of the present application.

Fig. 6 is a perspective view of an electronic device according to a fourth embodiment of the present application.

Description of the main elements

Electronic device 100

Body 105

Battery 1

Battery cells

10, 20, 30

First pole piece

11, 21

First

current collectors

110, 210

First

active layers

119, 219

First empty foil region 218

First end

111, 211

Third end

113, 213

Second pole piece 12, 22

Second current collector 120, 220

Second active layer 129, 229

Second empty foil region 228

Second end

122, 222

Fourth end

124, 224

Isolation films

13 and 23

Fifth ends

135, 235

Sixth end

136, 236

Insulating glue 15

First sub-insulating paste

151, 251

Second sub-insulating glue

152, 252

Third sub-insulating glue 153

Fourth sub-insulating paste 154

Fifth sub-insulating glue 155

Sixth sub-insulating paste 256

Seventh sub-insulating paste 257

Tabs

16, 26

First tab

17, 27

Second pole ears

18, 28

First end face

101, 201

First cambered

surface region

102, 202

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The following description will refer to the accompanying drawings to more fully describe the present disclosure. There is shown in the drawings exemplary embodiments of the present application. This application may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Like reference numerals designate identical or similar components.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Further, as used herein, the terms "comprises," "comprising," "includes" and/or "including" or "having" and/or "having," integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Furthermore, unless otherwise defined herein, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present application and will not be interpreted in an idealized or overly formal sense.

The following description of exemplary embodiments refers to the accompanying drawings. It should be noted that the components depicted in the referenced drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar terms.

Embodiments of the present application will now be described in further detail with reference to the accompanying drawings.

First embodiment

As shown in fig. 1 and fig. 2, a first embodiment of the present application provides a battery cell 10. The battery cell 10 includes a first pole piece 11, a second pole piece 12 and a separation film 13, wherein the first pole piece 11 and the second pole piece 12 are stacked at intervals, and the separation film 13 is disposed between the first pole piece 11 and the second pole piece 12. In an embodiment, the first pole piece 11 and the second pole piece 12 can be arranged in a laminated manner. In this embodiment, the first pole piece 11 and the second pole piece 12 are wound, the battery cell 10 further includes a winding pin 14, and the first pole piece 11, the isolation film 13 and the second pole piece 12 are sequentially disposed at intervals and wound around the winding pin 14.

The first electrode plate 11 includes a first current collector 110 and a first active layer 119, and the first active layer 119 is disposed on the surface of the first current collector 110. The first pole piece 11 includes a first end portion 111 and a third end portion 113, the first end portion 111 and the third end portion 113 are respectively located at two ends of the first pole piece 11, in an embodiment, the first end portion 111 is disposed outside the battery cell 10, the third end portion 113 is disposed in the battery cell 10, and a first active layer 119 is disposed on a surface of the first current collector 110 located at the first end portion 111.

The second electrode sheet 12 includes a second current collector 120 and a second active layer 129, and the second active layer 129 is disposed on the surface of the second current collector 120. The second pole piece 12 includes a second end portion 122 and a fourth end portion 124, where the second end portion 122 and the fourth end portion 124 are respectively located at two ends of the second pole piece 12, in an embodiment, the second end portion 122 is disposed outside the battery cell 10, and the fourth end portion 124 is disposed inside the battery cell 10.

In an embodiment, the battery cell 10 is a winding battery cell, the outermost pole piece of the battery cell 10 is a first pole piece 11, a first active layer 119 is disposed on a surface, facing the inside of the battery cell 10, of the first current collector 110 disposed on the outermost pole piece of the battery cell, and the first active layer 119 is not disposed on a surface, disposed on the outermost pole piece of the battery cell 10, of the first current collector 110. That is, the inner surface of the first pole piece 11 located at the outermost ring of the battery cell 10 is provided with the first active layer 119 to make it correspond to the second active layer 129 on the second pole piece 12, and the outer surface of the first pole piece 11 located at the outermost ring of the battery cell 10 is designed for an empty foil, so that the structure can improve the energy density of the battery cell 10 on the one hand, and can reduce the material consumption of consumables and improve the safety performance of the battery cell 10 on the other hand.

Define first terminal surface 101 to and the first cambered surface region 102 of being connected with first terminal surface 101, first terminal surface 101 is the face that contains the most outstanding point of the arc side of electric core 10 and extend along electric core 10 thickness direction, and first cambered surface region 102 is the face that electric core 10 side is arc setting. In one embodiment, the first end portion 111 and the second end portion 122 are disposed near the first end surface 101 and are disposed in the first arc surface region 102.

First end 111 and second end 122 set up in first cambered surface region 102, that is, the ending of first pole piece 11 and second pole piece 12 of electric core 10 cuts and is located "R angle" of electric core 10, this structure can make electric core 10 side obtain to support and promote the roughness and the whole compressive resistance of electric core 10 on the one hand, on the other hand, first end 111 and second end 122 that set up in first cambered surface region 102 compare in setting up the pressure that receives in other regions littleer, the burr of the cutting end of first pole piece 11 and second pole piece 12 is more difficult to pierce through barrier film 13, can effectively reduce the short circuit bad point in electric core 10, reduce the energy consumption of electric core 10 self-loopa, promote battery performance. By disposing the first end 111 and the second end 122 near the first end 101 and in the first arc surface region 102, the space between the first arc surface region 102 and the plane of the first end 101 can be fully utilized, and the energy density can be further improved.

A distance L1 from the first end 111 to the first end 101 in a direction perpendicular to the first end 101 is greater than a distance L2 from the second end 122 to the first end 101, L1 ranging from 2mm to 8mm, L2 ranging from 0mm to 3 mm; the distance between the first end 111 and the second end 122 is L3, L3 is greater than 2 mm. In one embodiment, the first pole piece 11 is a cathode, and the second pole piece 12 is an anode.

The separator 13 includes a fifth end portion 135 and a sixth end portion 136, the fifth end portion 135 and the sixth end portion 136 are respectively located at two ends of the separator 13, the fifth end portion 135 is disposed outside the battery cell 10, and the sixth end portion 136 is disposed in the battery cell 10 and wound around the winding pin 14. In one embodiment, the length of the tail portion of the separator 13 outside the battery cell 10 is longer than that of the first pole piece 11 and the second pole piece 12, at least two fifth ends 135 wrap around one second end 122, and a distance L4 between the fifth ends 135 and the second end 122 in a direction perpendicular to the first end surface 101 is greater than 4 mm.

The battery cell 10 further includes an insulating adhesive 15, where the insulating adhesive 15 includes a first sub-insulating adhesive 151 and a second sub-insulating adhesive 152, and the insulating adhesive 15 may be an organic insulating material, such as green glue, hot melt glue, and the like. The first current collector 110 is provided with a first sub-insulating paste 151 on the outer surface of the first arc surface region 102, the second sub-insulating paste 152 covers the first end portion 111 and the second end portion 122, the second sub-insulating paste 152 contacts with the first sub-insulating paste 151, and the second sub-insulating paste 152 covers a portion of the first sub-insulating paste 151 away from the first end portion 111. The first sub-insulating glue 151 and the second sub-insulating glue 152 are disposed on two sides of the first end portion 111 and the second end portion 122 (pole piece cutting ends), so as to further prevent burrs of the first end portion 111 and the second end portion 122 from piercing the isolation film 13 or a packaging bag outside the battery cell 10 to prevent liquid leakage and short circuit.

The insulating paste 15 further includes a third sub-insulating paste 153, a fourth sub-insulating paste 154, and a fifth sub-insulating paste 155, the third sub-insulating paste 153 is disposed in the empty foil region of the third end portion 113, and the outermost end of the third end portion 113 is not covered by the third sub-insulating paste 153.

The battery cell 10 further includes a tab 16, where the tab 16 may include a first tab 17 and a second tab 18, the first tab 16 is electrically connected to the first pole piece 11, specifically, the first tab 16 is formed by extending a first current collector 110, the second tab 18 is electrically connected to the second pole piece 12, and specifically, the second tab 18 is formed by extending a second current collector 120.

In one embodiment, the first tab 17 is disposed at the third end portion 113, the fourth sub-insulation paste 154 is disposed at both sides of the first tab 17 to protect the first tab 17, the fifth sub-insulation paste 155 is disposed at both sides of the end of the third end portion 113 and is a mirror image, and the second tab 18 is disposed at the fourth end portion 124.

Second embodiment

As shown in fig. 3 and 4, a battery cell 20 is provided in a second embodiment of the present application. The battery cell 20 includes a first pole piece 21, a second pole piece 22, and a separation film 23, wherein the first pole piece 21 and the second pole piece 22 are stacked at intervals, and the separation film 23 is disposed between the first pole piece 21 and the second pole piece 22. In one embodiment, the first pole piece 21 and the second pole piece 22 can be arranged in a laminated manner. In this embodiment, the first pole piece 21 and the second pole piece 22 are wound, the battery cell 20 further includes a winding pin 24, and the first pole piece 21, the isolation film 23 and the second pole piece 22 are sequentially disposed at intervals and wound around the winding pin 24.

The first electrode sheet 21 includes a first current collector 210 and a first active layer 219, and the first active layer 219 is disposed on the surface of the first current collector 210. The first pole piece 21 includes a first end portion 211 and a third end portion 213, the first end portion 211 and the third end portion 213 are respectively located at two ends of the first pole piece 21, in an embodiment, the first end portion 211 is disposed outside the battery cell 20, the third end portion 213 is disposed in the battery cell 20, and a first active layer 219 is disposed on a surface of the first current collector 210 located at the first end portion 211.

The second electrode sheet 22 includes a second current collector 220 and a second active layer 229, and the second active layer 229 is disposed on the surface of the second current collector 220. The second pole piece 22 includes a second end portion 222 and a fourth end portion 224, where the second end portion 222 and the fourth end portion 224 are respectively located at two ends of the second pole piece 22, and in an embodiment, the second end portion 222 is disposed outside the battery cell 20, and the fourth end portion 224 is disposed inside the battery cell 20.

In an embodiment, the battery cell 20 is a winding battery cell, the outermost pole piece of the battery cell 20 is a first pole piece 21, a first active layer 219 is disposed on a surface, facing the inside of the battery cell 20, of the first current collector 210 disposed on the outermost pole piece of the battery cell, and the first active layer 219 is not disposed on a surface, disposed on the outermost side of the battery cell 20, of the first current collector 210. That is, the inner surface of the first pole piece 21 located at the outermost ring of the battery cell 20 is provided with the first active layer 219, so that the first active layer 219 corresponds to the second active layer 229 on the second pole piece 22, and the outer surface of the first pole piece 21 located at the outermost ring of the battery cell 20 is designed to be an empty foil, so that the structure can improve the energy density of the battery cell 20 on the one hand, and can reduce the material consumption of consumables and improve the safety performance of the battery cell 20 on the other hand.

Define first terminal surface 201 to and the first cambered surface area 202 of being connected with first terminal surface 201, first terminal surface 201 is the face that contains the most outstanding point of the arc side of electric core 20 and extend along electric core 20 thickness direction, and first cambered surface area 202 is the face that the electric core 20 side is arc setting. In one embodiment, the first end portion 211 and the second end portion 222 are disposed near the first end surface 201 and in the first arc surface region 202.

The first end 211 and the second end 222 are disposed in the first arc area 202, that is, the ending of the first pole piece 21 and the second pole piece 22 of the battery cell 20 is cut at the "R angle" of the battery cell 20, which enables the side surface of the battery cell 20 to be supported and improves the flatness and the overall compressive resistance of the battery cell 20, on the other hand, the first end 211 and the second end 222 disposed in the first arc area 202 are less stressed than those disposed in other areas, the burrs at the cut ends of the first pole piece 21 and the second pole piece 22 are less likely to pierce the isolation film 23, which can effectively reduce the short circuit dead points in the battery cell 20, reduce the self-circulation energy consumption of the battery cell 20, and improve the battery performance. By arranging the first end portion 211 and the second end portion 222 close to the first end surface 201 and arranged on the first arc surface area 202, the space between the first arc surface area 202 and the plane of the first end surface 201 can be fully utilized, and the energy density is further improved.

A distance L1 from the first end 211 to the first end face 201 in a direction perpendicular to the first end face 201 is greater than a distance L2 from the second end 222 to the first end face 201, L1 ranging from 2mm to 8mm, L2 ranging from 0mm to 3 mm; the distance between the first end 211 and the second end 222 is L3, L3 is greater than 2 mm. In one embodiment, the first pole piece 21 is a cathode, and the second pole piece 22 is an anode.

The separator 23 includes a fifth end portion 235 and a sixth end portion 236, the fifth end portion 235 and the sixth end portion 236 are respectively located at two ends of the separator 23, the fifth end portion 235 is disposed outside the battery cell 20, and the sixth end portion 236 is disposed in the battery cell 20 and wound around the winding pin 24. In one embodiment, the length of the tail portion of the separation film 23 outside the battery cell 20 is longer than that of the first pole piece 21 and the second pole piece 22, at least two fifth end portions 235 wrap the second end portion 222, and a distance L4 between the fifth end portions 235 and the second end portion 222 in a direction perpendicular to the first end surface 201 is greater than 4 mm.

The battery cell 20 further includes an insulating glue 25, where the insulating glue 25 includes a first sub-insulating glue 251 and a second sub-insulating glue 252, and the insulating glue 25 may be an organic insulating material, such as green glue, hot melt glue, and the like. The first current collector 210 is provided with a first sub-insulating glue 251 on the outer surface of the first arc surface region 202, the second sub-insulating glue 252 covers the first end portion 211 and the second end portion 222, the second sub-insulating glue 252 is in contact with the first sub-insulating glue 251, and the second sub-insulating glue 252 covers the portion of the first sub-insulating glue 251 away from the first end portion 211. The first sub-insulating glue 251 and the second sub-insulating glue 252 are disposed on two sides of the first end portion 211 and the second end portion 222 (pole piece cutting ends), so as to further prevent burrs of the first end portion 211 and the second end portion 222 from piercing the isolation film 23 or a packaging bag outside the battery cell 20 to prevent liquid leakage and short circuit.

The battery cell 20 further includes a tab 26, where the tab 26 may include a first tab 27 and a second tab 28, the first tab 26 is electrically connected to the first pole piece 21, specifically, the first tab 26 is formed by extending a first current collector 210, the second tab 28 is electrically connected to the second pole piece 22, and specifically, the second tab 28 is formed by extending a second current collector 220.

In one embodiment, the first pole piece 21 includes a first empty foil region 218 and the second pole piece 22 includes a second empty foil region 228. The first current collector 210 located in the first empty foil region 218 is not covered by the first active layer 219, and the first empty foil region 218 is located in the inner circle of the battery cell 20; the second current collector 220 located in the second empty foil region 228 is not covered by the second active layer 229, and the second empty foil region 228 is located in the inner circle of the cell 20.

The insulation paste 25 further includes a sixth sub-insulation paste 256 and a seventh sub-insulation paste 257. The first tab 27 is arranged in the first empty foil area 218, and the sixth sub-insulating glue 256 is symmetrically arranged on two sides of the first tab 27; the second tab 28 is disposed in the second empty foil region 228, and the seventh sub-insulating glue 257 is symmetrically disposed on two sides of the second tab 28.

Third embodiment

Fig. 5 is a schematic plan view of a battery 1 according to a third embodiment of the present application. The battery 1 includes a battery cell 30, and the battery cell 30 may be the battery cell described in any one of the first embodiment and the second embodiment.

Fourth embodiment

Fig. 6 is a schematic perspective view of an electronic device 100 according to a fourth embodiment of the present disclosure.

The present application further provides an electronic device 100, which includes a body 105 and a battery 1 disposed in the body 105, where the battery 1 includes the battery cell according to the first embodiment or the second embodiment.

In fig. 6, the electronic device 100 is only an example of a mobile phone, and in other embodiments, the electronic device 100 may also be a wearable device, an unmanned aerial vehicle, a personal computer, an intelligent appliance, an industrial controller, an energy storage device, an electric tool, an electric vehicle, or the like.

Hereinbefore, specific embodiments of the present application are described with reference to the drawings. However, those skilled in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present application without departing from the spirit and scope of the application. Such modifications and substitutions are intended to be within the scope of the present application.

Claims

1. A battery cell, comprising:

the first pole piece comprises a first current collector and a first active layer, the first pole piece comprises a first end part, the first end part is arranged on the outer side of the battery core, and the first active layer is arranged on the surface of the first current collector, which is positioned at the first end part;

the first pole piece and the second pole piece are wound at intervals, and the first pole piece is arranged on the outermost circle of the battery cell; and

the battery cell structure comprises a first end face and a first cambered surface area connected with the first end face, wherein the first end portion is close to the first end face and is arranged in the first cambered surface area, the first end face is a face which contains the most prominent point of the arc-shaped side face of the battery cell and extends along the thickness direction of the battery cell, and the first cambered surface area is a face which is arranged in an arc shape on the side face of the battery cell.

2. The battery cell of claim 1, wherein a surface of the first current collector disposed at an outermost circle of the battery cell facing the inside of the battery cell is provided with the first active layer, and a surface of the first current collector disposed at an outermost side of the battery cell is not provided with the first active layer.

3. The battery cell of claim 1, wherein the second tab includes a second current collector and a second active layer, the second tab includes a second end portion, the second end portion is disposed near the first end surface and in the first arc surface region, the second active layer is disposed on a surface of the second current collector at the second end portion, and a distance from the first end portion to the first end surface is greater than a distance from the second end portion to the first end surface.

4. The battery cell of claim 3, wherein the battery cell further comprises an insulating paste, the insulating paste comprises a first sub-insulating paste and a second sub-insulating paste, the first sub-insulating paste is disposed on the surface of the first current collector disposed in the first arc surface region, the second sub-insulating paste covers the first end portion and the second end portion, and the second sub-insulating paste is in contact with the first sub-insulating paste.

5. The battery cell of claim 3, further comprising a separator film disposed between the first pole piece and the second pole piece, wherein a distance from one end of the separator film to the first end surface is less than a distance from the second end to the first end surface.

6. The cell of claim 4, wherein the first pole piece further comprises a third end, the second pole piece further comprises a fourth end, the third end and the fourth end disposed within the cell, and the cell further comprises a tab disposed at the third end and the fourth end.

7. The battery cell of claim 6, wherein the first active layer is not disposed on the surface of the first current collector at the third end, the second active layer is not disposed on the surface of the fourth end, the insulating paste further comprises a third sub-insulating paste, and the third sub-insulating paste is disposed on the surface of the first current collector at the third end.

8. The cell of claim 3, further comprising a tab, wherein the first pole piece comprises a first empty foil region, wherein the second pole piece comprises a second empty foil region, wherein a first current collector located in the first empty foil region is not covered by the first active layer, wherein a second current collector located in the second empty foil region is not covered by the second active layer, and wherein the tab is disposed in the first empty foil region and the second empty foil region.

9. A battery comprising a cell according to any of claims 1 to 8.

10. An electronic device comprising the battery according to claim 9.