CN217822863U - Electrode sheet and battery - Google Patents

Abstract

The utility model provides an electrode plate and a battery, the electrode plate comprises a current collector and a pole ear, the current collector is provided with a first surface and a second surface which are arranged oppositely along the thickness direction, at least part of the current collector is turned over, and the second surface of the turned over current collector is positioned above the first surface of the current collector which is not turned over; the tabs are respectively electrically connected with the second surface of the folded current collector and the first surface of the current collector which is not folded; the current collector is provided with a first edge extending along a first direction, the turned current collector is located in the middle section of the first edge, and the electrode plates can enable two sides of the current collector to be mutually communicated.

Description

Electrode sheet and battery

Technical Field

The utility model belongs to the technical field of the battery, concretely relates to electrode slice and battery.

Background

With the increasing requirements for energy density and safety of batteries, technicians in the lithium battery industry have begun to attempt to convert current collectors from metal foils into composite current collectors that are formed by combining an insulating layer with metal plating layers on both sides of the insulating layer.

The insulating layer makes the conductivity of the metal coating on both sides influenced, is difficult to realize the effective output of electron, and the prior art adopts two-layer or two utmost point ear to weld respectively in the both sides of compound mass flow body to realize switching on of metal coating, but can increase the quantity and the thickness of utmost point ear, increases the cost of manufacture usually. The through holes can be formed in the composite current collector to achieve conduction of the metal coating, but the strength of the through holes is difficult to guarantee in actual production, reliability is poor, and application difficulty is high.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electrode slice and battery, the at least part current collector of this electrode slice turns over a book, is connected with the second surface of the mass flow body that turns over a book and the first surface electricity of the mass flow body that does not turn over a book respectively through utmost point ear, can make the first surface and the second surface of the mass flow body switch on each other, has effectively overcome prior art's defect.

One aspect of the utility model provides an electrode plate, including the mass flow body and utmost point ear, the mass flow body has relative first surface and the second surface that sets up along the thickness direction, and at least some mass flow body turns over, and the second surface of the mass flow body that turns over is located the first surface of the mass flow body that does not turn over; the electrode lugs are respectively and electrically connected with the second surface of the folded current collector and the first surface of the unfolded current collector; the current collector is provided with a first edge extending along the first direction, and the folded current collector is located in the middle of the first edge.

In an embodiment of the present invention, the current collector includes a body and a connecting portion, the connecting portion is connected to the body, the connecting portion is located at a middle section of the first edge, the connecting portion is turned over with respect to the body, and a second surface of the turned-over connecting portion is located above the first surface of the body; the tabs are electrically connected with the second surface of the folded connecting part and the first surface of the unfolded body respectively.

In an embodiment of the present invention, the connecting portion is integrally formed with the body, or the connecting portion is assembled with the body.

In one embodiment of the present invention, the tab at least includes a first portion, a folded edge, and a second portion, wherein the folded edge is located between the first portion and the second portion; the first part of the tab is arranged above the turned current collector, the second part of the tab is arranged above the body which is not turned, and the folded edge is in contact with the edge of the connecting part.

In one embodiment of the present invention, the main body has an empty foil region, and the main body outside the empty foil region is covered with an active layer; the hollow foil area is located in the middle section of the current collector along the first edge, and the folded connecting portion is overlapped with at least part of the body located in the hollow foil area.

In an embodiment of the present invention, the connecting portion is protruded from the first edge of the body.

In an embodiment of the present invention, the current collector has a cutting line, and at least a portion of the current collector is cut along the cutting line to form the connecting portion.

In an embodiment of the present invention, the cutting lines include first cutting lines and second cutting lines distributed in a first direction, and cutting directions of the first cutting lines and the second cutting lines are perpendicular to the first direction.

In an embodiment of the present invention, a dimension of the connecting portion in the first direction is smaller than or equal to a dimension of the empty foil region in the first direction.

In an embodiment of the present invention, the dimension of the connecting portion in the second direction is H1, the dimension of the empty foil area in the second direction is H2, and H1 and H2 satisfy the following relationships: h1= (0.2 to 0.8) × H2, the second direction is perpendicular to the first direction.

The current collector of the present invention includes a first metal layer, an insulating layer, and a second metal layer stacked in sequence.

The utility model discloses an on the other hand provides a battery, and the battery is including range upon range of a plurality of positive plate and a plurality of negative pole piece that sets up in proper order, and positive plate and/or negative pole piece are aforementioned electrode slice.

The utility model discloses an implement, following beneficial effect has at least:

the utility model provides an electrode slice and battery, the mass flow body has relative first surface and the second surface that sets up along the thickness direction, and at least some collection body turns over, turns over the second surface of the mass flow body that turns over and lies in the first surface of the mass flow body that does not turn over, and utmost point ear is connected with the second surface of the mass flow body that turns over and does not turn over respectively and the first surface electricity of the mass flow body that does not turn over; by using such a current collector, conduction can be made on both sides of the current collector, whereby a decrease in battery performance can be suppressed.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings required for the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a first schematic view illustrating an overhead mounting of an electrode plate according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating a top view installation of an electrode plate according to an embodiment of the present invention;

fig. 3 is a schematic plan view illustrating installation of an electrode sheet according to an embodiment of the present invention;

fig. 4 is a schematic top view of an electrode sheet according to an embodiment of the present invention;

fig. 5 is a schematic top view of an electrode sheet according to an embodiment of the present invention;

fig. 6 is a schematic top view of an electrode sheet according to an embodiment of the present invention;

fig. 7 is a first cross-sectional view of a partially enlarged structure of an electrode sheet according to an embodiment of the present invention;

fig. 8 is a first schematic sectional view showing the electrode sheet according to an embodiment of the present invention;

fig. 9 is a second schematic sectional view showing the installation of a part of the electrode sheet according to an embodiment of the present invention;

description of reference numerals:

1-current collector;

11-a first surface;

12-a second surface;

13-a first edge;

110-a body;

111-a connecting portion;

1101-empty foil areas;

1102 — a first cutting line;

1103 — second cut line;

2-pole ear;

3-an active material layer;

with the above figures, certain embodiments of the present invention have been shown and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.

Detailed Description

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

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; mechanical connection or electrical connection; the two elements may be connected directly or indirectly through an intermediate medium, or the two elements may be connected to each other. Those skilled in the art can understand what is specifically meant by the present invention in specific cases. Furthermore, the terms "first", "second", and the like are used for descriptive purposes only, such as to distinguish components for clarity/explanation of the technical solution, and are not to be construed as indicating or implying any number of technical features or order of substantial significance, etc.

Referring to fig. 1 to 9, the present invention provides an electrode plate, including a current collector 1 and a tab 2, the current collector 1 has a first surface 11 and a second surface 12 which are oppositely arranged along a thickness direction, at least a part of the current collector is turned over, and the second surface of the turned current collector is located above the first surface of the current collector which is not turned over; the tabs 2 are respectively electrically connected with the second surface 12 of the folded current collector and the first surface 11 of the unfolded current collector; the current collector has a first edge 13 extending in a first direction, and the folded current collector is located in the middle of the first edge 13.

The utility model discloses in, it is regional to have the utmost point ear that is used for connecting utmost point ear on the mass flow body 1, and the mass flow body has relative first surface 11 and the second surface 12 that sets up along the thickness direction, can set up utmost point ear on first surface and/or second surface according to actual conditions.

The utility model discloses the first direction can be the length extending direction of mass flow body 1. The current collector 1 has two edges extending along the first direction, the present invention does not limit the first edge 13, and any edge extending along the first direction on the current collector 1 may be used.

Note that the X direction in fig. 1 to 6, i.e., the first direction, the Y direction in fig. 1 to 9, i.e., the second direction, and the Z direction in fig. 7 to 9, i.e., the thickness direction of the current collector.

Referring to fig. 1 to 6, along the extending direction of the first edge 13, the first edge 13 has two ends, and the middle section of the first edge 13 is not located at the two ends of the first edge 13. The utility model discloses in, make at least part current collector 1 turn over the book, the utility model discloses do not limit to the operation of turning over a book, the number of times of turning over a book can be once or many times. When the turnover times are multiple, the inner surfaces of the current collectors which are turned over multiple times can be contacted or not contacted.

Referring to fig. 7, the second surface 12 of the folded current collector and the first surface 11 of the non-folded current collector face the same side, specifically, the side facing the first surface 11.

When the second surface 12 of the folded-over current collector 1 and the first surface 11 of the unfolded current collector 1 face the same side, the first surface 11 of the at least partially folded-over current collector and the first surface 11 of the unfolded current collector may contact each other.

To achieve that second surface 12 of folded-over current collector 1 faces the same side as first surface 11 of unfolded current collector 1, folded-over current collector 1 is typically a blank area that does not contain any coating, so that the surface of the folded-over portion of current collector 1 can be exposed.

The utility model discloses in, can utilize utmost point ear 2 to be connected with the second surface 12 of the mass flow body of turning over a respectively and the 11 electricity on the first surface of the mass flow body of turning over a not for switch on between two surfaces of the mass flow body, thereby realize that electric current derives or channels into from the mass flow body 1, can also reduce utmost point ear 2's occupation space, from this, be favorable to promoting the energy density of battery, restrain the reduction of battery performance.

The current collector 1 may be divided into a body 110 and a connection part 111 according to whether it is folded or not, the connection part 111 is used for folding, and the body 110 is not folded.

In some embodiments, the current collector includes a body 110 and a connection portion 111, the connection portion 111 is connected to the body 110, and the connection portion 111 and the body 110 may be integrally formed or assembled.

The body 110 has a first edge 13 extending along a first direction, and the connection portion 111 may be located at a middle section of the first edge 13, for example, the connection portion 111 may be located at a middle position of the first edge 13.

To achieve at least partial folding of the fluid collection 1, the connection 111 may be folded with respect to the body 110, for example, the connection 111 may be folded towards the body 110, such that the second surface 12 of the folded connection 111 is located above the first surface 11 of the body, for example, the second surface 12 of the folded connection 111 and the first surface 11 of the body 110 are located towards the first surface 11.

Generally, the connecting portion 111 has two opposite sides in the thickness direction, and both sides are blank regions without any coating, so that the second surface 12 of the connecting portion 111 can be exposed, which is beneficial to electrically connecting the tab 2 with the second surface 12 of the folded connecting portion 111.

The connecting portion 111 is folded with respect to the body 110, the first surface 11 of the connecting portion 111 contacts with the first surface of the body, and the second surface 12 of the connecting portion 111 faces the same side as the first surface 11 of the body.

In general, the body 110 has a hollow foil region 1101 without any coating, the hollow foil region 1101 being a tab region for connecting the tabs 2, and a region of the body 110 other than the hollow foil region 1101 being an active layer region covered with the active material layer 3.

In the extending direction of the current collector 1, a corresponding portion of the active material layer is removed to expose the current collector by a process of washing, doctor blading, foaming, or the like, so as to form a hollow foil area 1101, and a tab 2 is disposed in the hollow foil area 1101. The cleaning mode can be laser cleaning, mechanical cleaning or foaming glue cleaning and the like, and the cleaning mode is not limited in the application.

In addition, zebra-stripe coating, which is conventional in the art, may also be adopted, so that a blank area is left in the corresponding position of the current collector 1 as a blank foil area 1101.

The utility model discloses an empty paper tinsel district 1101 is located the middle section of mass flow body 1 along first edge 13. In order to connect the tab 2, the connection portion 111 needs to be connected to the first edge 13 corresponding to the empty foil region 1101, so that the folded connection portion 111 can be located in the empty foil region 1101 as well, and electrical connection between the tab 2 and the current collector 1 is ensured. Specifically, when the connecting portion 111 is folded back, it overlaps at least a portion of the body 110 located in the empty foil area 1101.

The empty foil region 1101 and the connecting portion 111 may be integrally formed or may be assembled. It should be noted that the empty foil area 1101 of the present invention may be located on only one surface of the body as shown in fig. 9, or may be located on two surfaces of the body 110 as shown in fig. 8, and the arrangement of the single surface and the double surfaces of the specific empty foil area 1101 needs to be selected or adjusted according to the arrangement of the connecting portion 111.

As shown in fig. 1, in one embodiment, the connecting portion 111 is protruded from the first edge 13 of the body 110. The connection portion 111 is folded back on the body 110, thereby obtaining a current collector as shown in fig. 3. At this time, the second surface 12 of the connection part 111 and the first surface 11 of the body 110 face the same side, and the tab 2 is connected to the second surface 12 of the connection part 111 and the first surface 11 of the body 110, respectively, thereby achieving electrical connection between the tab 2 and the current collector 1. Specifically, fig. 5 and 7 are schematic diagrams of the pole pieces after the tab 2 is connected. In this embodiment, the empty foil region 1101 may be provided on one side or both sides, and further, in order to improve the energy density of the battery, it is preferable to provide the empty foil region on one side.

In another embodiment, as shown in fig. 2, the current collector 1 has a cutting line, such that at least a portion of the current collector 1 is cut along the cutting line to form the connection portion 111. Generally, a cutting line is disposed in the empty foil area 1101, and the connecting portion 111 is cut along the cutting line of the empty foil area 1101, and at this time, the connecting portion 111 is located in the first edge 13. The connection portion 111 is folded back toward the body 110, thereby obtaining a current collector as shown in fig. 4. At this time, the second surface 12 of the connection part 111 and the first surface 11 of the body 110 face the same side, and the tab 2 is connected to the second surface 12 of the connection part 111 and the first surface 11 of the body 110, respectively, thereby achieving electrical connection between the tab 2 and the current collector 1. Specifically, fig. 6 is a schematic diagram of the pole piece after the tab 2 is connected. In this embodiment, the partially empty foil region 1101 forming the connection portion 111 may be provided on both sides, and the remaining partially empty foil region 1101 may be provided on one side or both sides, and preferably, the partially empty foil region 1101 is provided on both sides.

The number of the cutting lines may be one or more, and generally, the number of the cutting lines is two, and the cutting lines include a first cutting line 1102 and a second cutting line 1103 that are distributed in a first direction, where the cutting directions of the first cutting line 1102 and the second cutting line 1103 may be parallel to each other, or may not be parallel to each other. Preferably parallel, the cutting directions of the first cut line 1102 and the second cut line 1103 are both perpendicular to the first direction.

The folded connection 111 is generally not beyond the first edge 13 to improve the performance of the pole piece.

The folded-over connection 111 does not exceed the edge of the empty foil area 1101, i.e. the folded-over connection 111 is located within the empty foil area 1101.

In order to realize that the connection portion is located in the empty foil area, please refer to fig. 1 and fig. 2, it is required that a dimension W2 of the connection portion 111 in the first direction is less than or equal to a dimension W1 of the empty foil area 1101 in the first direction, that is, W2 is less than or equal to W1.

A dimension H1 of the connection portion 111 in a second direction is smaller than a dimension H2 of the empty foil area 1101 in the second direction, wherein the second direction is perpendicular to the first direction.

In one possible embodiment, H1, H2 satisfy the following relationship: h1= (0.2 to 0.8) × H2.

By using the current collector 1 as described above, electrical connection with the second surface 12 and the first surface 11 of the current collector 1 may be achieved using the tabs 2, respectively. The tab 2 is electrically connected to the second surface of the folded connection portion 111 and the first surface of the empty foil area 1101, and the tab 2 may be attached to the surface of the current collector 1 and welded and fixed in the area of the attached portion.

The tab 2 at least comprises a first part, a folded edge and a second part, wherein the folded edge is positioned between the first part and the second part; the first part of the tab is arranged above the turned current collector, the second part of the tab is arranged above the body which is not turned, and the folded edge is in contact with the edge of the connecting part.

The tab 2 may extend beyond the first edge 13 of the current collector, so as to form a tab of the battery for an external electric device when the electrode sheet is applied to the battery.

The connection method of the tab 2 includes, but is not limited to, welding, for example, laser welding, spot welding, ultrasonic welding, and the like, and ultrasonic welding is preferable.

The utility model discloses do not injecing the type of the mass flow body, the utility model discloses be particularly useful for compound mass flow body, this compound mass flow body specifically can include first metal level, insulating layer and the second metal level of following the thickness direction and range upon range of setting in proper order. The insulating layer is located between the first metal layer and the second metal layer.

The side on which the first metal layer is located may be the first surface 11 of the current collector and the side on which the second metal layer is located may be the second surface 12 of the current collector.

The insulating layer is made of an insulating material, such as a polymer film made of a polymer material, and the first metal layer and the second metal layer are made of a metal conductive material and are respectively arranged on two sides of the insulating layer. The utility model discloses do not limit to the concrete material of metal conducting material, for example can be copper or aluminium. The first metal layer and the second metal layer are generally made of the same material. The composite current collector formed by the materials can improve the safety performance of the electrode plate.

The first metal layer and the second metal layer are arranged on the insulating layer, and can be electroplated or sprayed or glued, and the utility model is not limited by the invention.

The electrode sheet may be a negative electrode sheet or a positive electrode sheet, and the materials of the tab 2, the current collector 1, and each active material layer 3 may be specifically selected according to the electrical properties of the electrode sheet. For example, when the electrode sheet is a positive electrode sheet, the first metal layer and the second metal layer may be made of aluminum, the active material layer 3 is made of a ternary material or a positive electrode active material such as lithium iron phosphate, and the tab 2 is made of aluminum; when the electrode sheet is a negative electrode sheet, the first metal layer and the second metal layer may be made of copper, the active material layer 3 is made of a negative electrode active material such as graphite and silicon-based, and the tab 2 is made of nickel.

The utility model also provides a battery, battery are including a plurality of positive plate and a plurality of negative pole piece that range upon range of the setting in proper order, and positive plate and/or negative pole piece are aforementioned electrode slice.

Illustratively, the battery comprises N positive plates and M negative plates which are sequentially stacked, wherein the positive plates and/or the negative plates are the electrode plates, N is more than or equal to 1, and M is more than or equal to 1.

In the battery, a diaphragm is arranged between every two adjacent positive plates and negative plates and is used for preventing the short circuit of the battery caused by the contact of the polar plates with opposite polarities.

The battery may be a wound battery and a stacked battery. The positive electrode tab, the separator, and the negative electrode tab, which are stacked in a wound battery in which the positive electrode tab, the separator, and the negative electrode tab, each of which is cut to a corresponding size, are stacked, are wound to be built in the case.

The utility model provides a battery, this battery includes above-mentioned electrode slice, the electrode slice can be positive plate or negative pole piece, through making in the electrode slice, at least some collection body 1 turns over the book, the second surface 12 of the mass flow body 1 that turns over the book is located the first surface 11 tops of the mass flow body 1 that does not turn over the book, utilize utmost point ear 2 to be connected with the second surface 12 of the mass flow body 1 that turns over the book and the first surface 11 electricity of the mass flow body 1 that does not turn over the book respectively, can not only realize utmost point ear 2 and the fixed connection of mass flow body 1, can also switch on the metal level of the mass flow body 1 both sides, effectively guarantee the output of electric current in the battery, can improve the security performance and the charge-discharge performance of battery.

The invention will be further illustrated by the following specific examples.

Example 1

Referring to fig. 1, 3 and 5, the tab 2 has a width of 6mm in the first direction; the current collector 1 is a composite current collector;

coating active material layers 3 on a first surface 11 and a second surface 12 of a current collector 1 respectively; in the coating process, a hollow foil area 1101 is reserved in the middle of the first edge 13 of the current collector 1, and the hollow foil area 1101 is cleaned, so that the surface of the hollow foil area 1101 is exposed; with hollow foil region 1101 having a dimension W1 in a first direction of 10mm and a dimension H2 in a second direction of 15mm;

the connection 111 beyond the first edge 13 is connected over the empty foil area 1101, the connection 111 being folded back towards the application area such that the folded-back connection 111 partially overlaps the empty foil area 1101, wherein the connection 111 has a dimension W2 in the first direction of 8mm, a dimension H1 in the second direction of 7mm,

the electrode tabs 2 are electrically connected to the second surface 12 of the folded-over connection portion 111 and the first surface 11 of the non-folded-over empty foil region 1101, respectively, to form electrode tabs.

Example 2

Referring to fig. 2, 4 and 6, the tab 2 has a width of 6mm in the first direction; the current collector 1 is a composite current collector;

coating active material layers 3 on a first surface 11 and a second surface 12 of a current collector 1 respectively; in the coating process, a hollow foil area 1101 is reserved at the middle position of the pole piece, and the hollow foil area 1101 is cleaned, so that the surface of the hollow foil area 1101 is exposed; with a dimension W1 of the hollow foil region 1101 in a first direction of 10mm and a dimension H2 in a second direction of 13mm;

punching the empty foil area 1101 along a first cutting line 1102 and a second cutting line 1103 to form a connecting portion 111, folding the connecting portion 111 toward the coating area, and forming a notch in the empty foil area 1101 such that the folded connecting portion 111 partially overlaps the empty foil area 1101; wherein the dimension W2 of the connecting portion 111 in the first direction is 8mm, the dimension H1 in the second direction is 6mm,

the tab 2 is electrically connected to the second surface 12 of the folded-over connection portion 111 and the first surface 11 of the non-folded-over empty foil region 1101, respectively, to form an electrode tab.

Example 3

The present embodiment provides a battery, including a positive plate, a separator, and a negative plate, where the positive plate and the negative plate adopt the electrode sheets provided in embodiment 1 or 2, where a metal layer of a current collector of the positive plate is aluminum, and a metal layer of a current collector of the negative plate is copper. The positive electrode sheet, the separator, and the negative electrode sheet were stacked in this order and wound to form a battery.

It should be noted that the numerical values and numerical ranges related to the embodiments of the present invention are approximate values, and there may be a certain range of errors due to the manufacturing process, and the error can be considered to be ignored by those skilled in the art.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (12)

1. An electrode plate is characterized by comprising a current collector and a tab, wherein the current collector is provided with a first surface and a second surface which are oppositely arranged along the thickness direction, at least part of the current collector is turned over, and the second surface of the turned-over current collector is positioned above the first surface of the current collector which is not turned over;

the tabs are respectively electrically connected with the second surface of the folded current collector and the first surface of the current collector which is not folded;

the current collector is provided with a first edge extending along a first direction, and the folded current collector is located in the middle section of the first edge.

2. The electrode sheet of claim 1, wherein the current collector comprises a body and a connection portion, the connection portion is connected to the body, the connection portion is located in the middle of the first edge, the connection portion is folded relative to the body, and a second surface of the folded connection portion is located above the first surface of the body;

the tabs are electrically connected with the second surface of the folded connecting part and the first surface of the body which is not folded.

3. The electrode sheet according to claim 2, wherein the connecting portion is integrally formed with the body, or the connecting portion is assembled with the body.

4. The electrode sheet as claimed in claim 2, wherein the tab comprises at least a first portion, a folded edge, a second portion, the folded edge being located between the first portion and the second portion;

the first part of the tab is arranged above the current collector which is turned over, the second part of the tab is arranged above the body which is not turned over, and the folded edge is in contact with the edge of the connecting part.

5. The electrode sheet of claim 2, wherein the body has a hollow foil region, and the body outside the hollow foil region is covered with an active layer;

the empty foil area is located the middle section of mass flow body along first edge, and the connecting portion that turns over overlaps with the at least part that is located empty foil area the body.

6. The electrode sheet of claim 5, wherein the connecting portion is raised from the first edge of the body.

7. The electrode sheet according to claim 5, wherein the current collector has a cutting line along which at least a part of the current collector is cut to form the connection portion.

8. The electrode sheet according to claim 7, wherein the cutting lines include first cutting lines and second cutting lines distributed in the first direction, and the cutting directions of the first cutting lines and the second cutting lines are perpendicular to the first direction.

9. The electrode sheet according to claim 7, wherein a dimension of the connecting portion in the first direction is equal to or less than a dimension of the empty foil region in the first direction.

10. The electrode sheet according to any one of claims 5 to 9, wherein the connecting portion has a dimension H1 in the second direction, the empty foil region has a dimension H2 in the second direction, and H1 and H2 satisfy the following relationship: h1= (0.2 to 0.8) × H2, the second direction being perpendicular to the first direction.

11. The electrode sheet according to any one of claims 1 to 9, wherein the current collector includes a first metal layer, an insulating layer, and a second metal layer, which are sequentially stacked.

12. A battery comprising a plurality of positive electrode sheets and a plurality of negative electrode sheets stacked in sequence, wherein the positive electrode sheets and/or the negative electrode sheets are the electrode sheets according to any one of claims 1 to 11.

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