CN120261923A

CN120261923A - Batteries and electrical devices

Info

Publication number: CN120261923A
Application number: CN202410011657.1A
Authority: CN
Inventors: 余正发
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2024-01-02
Filing date: 2024-01-02
Publication date: 2025-07-04

Abstract

The application relates to the technical field of battery energy, in particular to a battery and an electric device. The battery comprises a battery core and a packaging film wrapped on the outer side of the battery core, wherein the battery core comprises a positive plate and a negative plate, the positive plate and the negative plate are stacked and then are wound together, at least one first protruding part is arranged on one side of the positive plate at intervals, at least one second protruding part is arranged on one side of the negative plate at intervals, the first protruding parts and the second protruding parts are stacked in a staggered mode to limit a battery core unit, a top sealing edge is arranged at the end portion of the packaging film, a protruding part is arranged on one side of the top sealing edge, an accommodating cavity is defined by the inner wall of the protruding part, and the battery core unit is accommodated in the accommodating cavity. According to the battery provided by the application, more active substances can be accommodated in the space at one side of the top edge, the volume ratio of the battery core in the battery is increased, and the volume energy density of the battery is effectively improved.

Description

Battery and electricity utilization device

Technical Field

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

Background

Lithium ion batteries have been increasingly used in the field of consumer electronics due to their high energy density characteristics. With the continuous increasing demand of consumer electronics for energy density of lithium ion batteries, increasing the energy per unit space of lithium ion batteries is one of the development directions of lithium ion batteries.

At present, a soft package lithium ion battery comprises a battery cell and a packaging film wrapping the outer side of the battery cell, and a tab of the battery cell is arranged at the end part of the battery cell. In the production process of the soft package lithium ion battery, a top sealing edge is formed at one end of the battery cell, provided with the electrode lug, the inside of the packaging film can form a sealed environment through the top sealing edge, and meanwhile, the space at one side of the packaging film can be used for installing a battery protection plate.

However, the energy density of the battery is difficult to be effectively increased.

Disclosure of Invention

Based on the above, the application provides a battery and an electric device, which are used for solving the problem that the energy density of the battery is difficult to effectively improve in the related art.

In one aspect, the application provides a battery, comprising a battery cell and a packaging film wrapping the outside of the battery cell;

The battery cell comprises a positive plate and a negative plate, the positive plate and the negative plate are stacked and then are wound together, at least one first protruding part is arranged at one side of the positive plate at intervals, at least one second protruding part is arranged at one side of the negative plate at intervals, and the first protruding parts and the second protruding parts are stacked in a staggered manner to define a battery cell unit;

The tip of packaging film is provided with top banding, and one side of top banding is provided with the convex part, and the inner wall of convex part defines and holds the chamber, and the electric core unit holds in holding the intracavity.

In one possible implementation, the first projection has a dimension in the first direction that is less than or equal to a dimension of the top seal in the first direction, and the second projection has a dimension in the first direction that is less than or equal to a dimension of the top seal in the first direction.

In one possible implementation, the first projection and the second projection are each sheet-like structures parallel to the top edge seal.

In one possible implementation manner, the first end of the positive electrode sheet in the length direction of the positive electrode sheet is provided with a first single-sided area, wherein one first protruding part is located in the first single-sided area, and the first protruding part on the first single-sided area is located at one end of the cell unit.

In one possible implementation, the second end of the negative electrode sheet in the length direction of the negative electrode sheet is provided with a second single-sided region, wherein one second protruding part is positioned in the second single-sided region, and the second protruding part on the second single-sided region is positioned at the other end of the cell unit.

In one possible implementation, the positive tab is provided with a positive tab, the positive tab is disposed at an interval from the first protruding portion, the negative tab is provided with a negative tab, the negative tab is disposed at an interval from the second protruding portion, and the positive tab and the negative tab extend out of the packaging film from the top seal, respectively.

In one possible implementation, the positive and negative tabs have a gap in the thickness direction of the top seal, the gap being less than or equal to 1mm.

In one possible implementation, the positive electrode lug and the negative electrode lug are respectively coated with lug glue, and each lug glue is in sealing connection with the top sealing edge.

In one possible implementation manner, the battery cell further comprises a diaphragm, the diaphragm is arranged between the positive plate and the negative plate, a plurality of third protruding parts are arranged on one side of the diaphragm at intervals, and the third protruding parts are arranged between the first protruding parts and the second protruding parts.

In one possible implementation, the protrusion and the top seal have a spacing in the thickness direction of the top seal.

In another aspect, the present application provides an electric device, including the above battery.

The battery comprises a battery core and a packaging film wrapped on the outer side of the battery core, wherein a positive plate and a negative plate of the battery core are stacked and then wound together. One side of the positive plate is provided with a first protruding part, one side of the negative plate is provided with a second protruding part, and the first protruding part and the second protruding part define an electric core unit. The packaging film is provided with the convex part on one side of the top edge, and the battery cell unit is accommodated in an accommodating cavity defined by the convex part. Therefore, more active substances can be contained in the space on one side of the top sealing edge, the volume ratio of the battery core in the battery is increased, and the volume energy density of the battery is effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a structure of a battery in the related art;

fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present application;

FIG. 3 is a cross-sectional view of FIG. 2 at position L1;

FIG. 4 is a cross-sectional view of FIG. 2 at position L2;

FIG. 5 is a cross-sectional view of FIG. 2 at position L3;

FIG. 6 is a cross-sectional view of FIG. 2 at position L4;

FIG. 7 is a cross-sectional view of FIG. 2 at position L5;

Fig. 8 is a schematic structural view of a packaging film according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a positive plate according to an embodiment of the present application;

FIG. 10 is a top view of a positive plate according to an embodiment of the present application;

FIG. 11 is a bottom view of a positive electrode sheet according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a negative plate according to an embodiment of the present application;

Fig. 13 is a top view of a negative plate according to an embodiment of the present application;

fig. 14 is a bottom view of a negative electrode sheet according to an embodiment of the present application.

Reference numerals illustrate:

100-battery cell, 110-positive plate, 111-first protruding part, 112-first single-sided area, 113-positive tab, 114-positive current collector, 115-positive active layer, 120-negative plate, 121-second protruding part, 122-second single-sided area, 123-negative tab, 124-negative current collector, 125-negative active layer, 130-battery cell, 140-tab glue, 150-separator, 151-third protruding part;

200 parts of packaging film, 210 parts of top edge sealing and 220 parts of convex parts.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the preferred embodiments of the present application will be described in more detail with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the application. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, indirectly connected through an intermediary, or may be in communication with each other between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship of the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The terms first, second, third and the like in the description and in the claims and in the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or display that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or display.

In the prior art, as shown in fig. 1, after the soft package lithium ion battery is packaged, a top sealing edge 210 is formed at the end of a packaging film 200, a sealing environment is formed inside the packaging film 200 by using the top sealing edge 210, and meanwhile, a space at one side of the top sealing edge 210 can be used for placing a battery protection plate. However, the space of the side of the top sealing edge 210 facing away from the battery protection plate occupies the volume of the battery, limiting the volume ratio of the battery cell in the battery, and making it difficult to effectively increase the energy density of the battery.

Through repeated thinking and verification, the inventor finds that if part of the battery core can extend into the space on one side of the top sealing edge, which is away from the battery protection board, after the battery is packaged, the packaging film forms a convex part on one side of the top sealing edge, and the convex part is used for wrapping the part of the battery core extending into one side of the top sealing edge. Therefore, more active substances can be contained in the space of the side, away from the battery protection plate, of the top edge of the battery, and compared with the existing battery, the volume ratio of the battery core is increased, so that the energy density of the battery can be effectively improved.

In view of the above, the inventors have devised a battery and an electric device, in which the battery core ensures the positive electrode sheet and the negative electrode sheet, which are laminated and then wound together. One side of the positive plate is convexly provided with a first protruding part, one side of the negative plate is convexly provided with a second protruding part, the first protruding part and the second protruding part extend into one side of the top sealing edge, and the first protruding part and the second protruding part are stacked in a staggered mode. The packaging film of the battery is provided with a convex part on one side of the top edge, and the battery core unit is wrapped by the convex part. Therefore, the volume ratio of the battery core in the battery is increased, and the volume energy density of the battery is effectively improved.

The following describes in detail the technical scheme of the battery and the power consumption device provided by the embodiment of the application with reference to the accompanying drawings.

Referring to fig. 2 to 14, a battery pack according to an embodiment of the present application includes a battery cell 100 and a packaging film 200 wrapped outside the battery cell 100. The battery cell 100 comprises a positive plate 110 and a negative plate 120, wherein the positive plate 110 and the negative plate 120 are stacked and then are wound together, at least one first protruding part 111 is arranged at one side of the positive plate 110 at intervals, at least one second protruding part 121 is arranged at one side of the negative plate 120 at intervals, and the first protruding parts 111 and the second protruding parts 121 are stacked in a staggered manner to define a battery cell unit 130. The end of the packaging film 200 is provided with a top sealing edge 210, one side of the top sealing edge 210 is provided with a convex part 220, the inner wall of the convex part 220 defines a containing cavity, and the battery cell unit 130 is contained in the containing cavity.

For example, an aluminum plastic film may be used as the packaging film 200, and the top sealing edge 210 is a sheet structure protruding from the end of the packaging film 200. It can be understood that the battery cell 100 of the present application is a rolled core, specifically, after the positive electrode sheet 110 and the negative electrode sheet 120 are stacked, the stacked electrode sheets are wound from the second end to the first end to form the battery cell 100. The first protruding portion 111 is located at one side in the width direction of the positive electrode sheet 110, the second protruding portion 121 is located at one side in the width direction of the negative electrode sheet 120, and after the positive electrode sheet 110 and the negative electrode sheet 120 form the battery cell 100, the first protruding portion 111 and the second protruding portion 121 are located at the same side of the battery cell 100. The first protrusion 111 and the second protrusion 121 may have rectangular shapes, respectively, and when the positive electrode tab 110 and the negative electrode tab 120 are wound together, the cell unit 130 formed by the first protrusion 111 and the second protrusion 121 protrudes from the main body portion of the cell 100. The number of the first protruding portion 111 and the second protruding portion 121 is not limited in this embodiment, and may be set as needed by those skilled in the art. Alternatively, the protrusion 220 may be formed at the end of the aluminum plastic film by molding.

It should be noted that the first protruding portion 111 is provided with the positive electrode active layer 115, and the second protruding portion 121 is provided with the negative electrode active layer 125. When the cell unit 130 formed by the first protrusion 111 and the second protrusion 121 extends into one side of the top sealing edge 210, the space occupied by the battery is unchanged compared with the battery in the related art, but the active material of the battery is increased, and thus the energy density of the battery is increased.

When the number of the first protrusions 111 is plural, the interval between adjacent two of the first protrusions 111 gradually increases in the winding direction of the positive electrode sheet 110. When the number of the second protrusions 121 is plural, the interval between adjacent two of the second protrusions 121 gradually increases in the winding direction of the negative electrode sheet 120.

The battery provided by the application is characterized in that an electric core 100 is formed by laminating a positive electrode plate 110 and a negative electrode plate 120 and then winding the positive electrode plate and the negative electrode plate together. A first protrusion 111 is provided at one side of the positive electrode tab 110, a second protrusion 121 is provided at one side of the negative electrode tab 120, and the first protrusion 111 and the second protrusion 121 define the battery cell 130. The packaging film 200 is provided with a protrusion 220 at one side of the top sealing edge 210, and the battery cell 130 is accommodated in an accommodating cavity defined by the protrusion 220. In this way, the space on one side of the top edge seal 210 can accommodate more active substances, the volume ratio of the battery cell 100 in the battery is increased, and the volume energy density of the battery is effectively improved.

The direction indicated by the X-axis in fig. 5-7 is defined herein as the first direction. In one embodiment, as shown in fig. 2-7, the first protrusion 111 has a dimension in the first direction that is less than or equal to the dimension of the top seal 210, and the second protrusion 121 has a dimension in the first direction that is less than or equal to the dimension of the top seal 210.

It will be appreciated that when the dimension of the first protrusion 111 in the first direction and the dimension of the second protrusion 121 in the first direction do not exceed the dimension of the top seal 210 in the first direction, the dimension of the cell 130 in the first direction does not exceed the dimension of the top seal 210 in the first direction. The size of each of the first protrusion 111 and the second protrusion 121 may be set as required by those skilled in the art, and is not limited only herein. The above arrangement can make the dimension of the protrusion 220 in the first direction smaller than or equal to the top seal 210, so as to avoid the increase of the dimension of the battery in the first direction caused by the end of the protrusion 220 exceeding the top seal 210, and ensure the energy density of the battery.

In a specific embodiment, as shown in fig. 4, the first protrusion 111 and the second protrusion 121 are each sheet-like structures parallel to the top sealing edge 210.

Specifically, after the positive electrode sheet 110 and the negative electrode sheet 120 are laminated and wound, the bending region at the end of the winding core is not located on the first protruding portion 111 and the second protruding portion 121. The cell unit 130 formed by the first protruding part 111 and the second protruding part 121 has a rectangular block structure.

Through the arrangement, the space occupied by the battery cell unit 130 in the direction pointed by the Y axis is reduced, so that more protruding parts can be accommodated in the accommodating cavity, the energy density of the battery cell unit 130 is improved, and the energy density of the battery cell 100 is improved.

As shown in fig. 3,4, and 9 to 11, the positive electrode sheet 110 is provided with a first single-sided region 112 at a first end in the length direction of the positive electrode sheet 110. One of the first protruding parts 111 is located in the first single-sided area 112, and the first protruding part 111 on the first single-sided area 112 is located at one end of the battery cell 130.

Illustratively, the positive electrode sheet 110 includes a positive electrode current collector 114 and positive electrode active layers 115 coated on opposite sides of the positive electrode current collector 114, respectively. At the first end of the positive electrode tab 110, the positive electrode active layer 115 on one side of the positive electrode collector 114 exceeds the positive electrode active layer 115 on the other side, thereby forming a first single-sided region 112 at the first end of the positive electrode tab 110. When the positive electrode sheet 110 and the negative electrode sheet 120 are wound, the first single-sided region 112 is located at the edge of the battery cell 100. It will be appreciated that the first protrusion 111 on the first single-sided region 112 is located on the side of the cell unit 130 facing away from the top edge seal 210.

In this structure, the positive electrode active layer 115 does not exist between the side of the cell unit 130 facing away from the top edge seal 210 and the convex portion 220, so that the energy density of the cell unit 130 can be ensured while the cost of active materials is saved, and the energy density of the battery is further ensured.

As shown in fig. 3, 4, and 12 to 14, the negative electrode sheet 120 is provided with a second single-sided region 122 at a second end in the length direction of the negative electrode sheet 120. One of the second protruding parts 121 is located in the second single-sided area 122, and the second protruding part 121 on the second single-sided area 122 is located at the other end of the cell unit 130.

Fig. 12 to 14 show that the negative electrode tab 120 includes a negative electrode current collector 124 and negative electrode active layers 125 coated on opposite sides of the negative electrode current collector 124, respectively. At the second end of the negative electrode tab 120, the negative electrode active layer 125 on one side of the negative electrode current collector 124 exceeds the negative electrode active layer 125 on the other side, thereby forming the first single-sided region 112 at the second end of the negative electrode tab 120. When the positive electrode tab 110 and the negative electrode tab 120 are wound, the second single-sided region 122 is located at the center of the battery cell 100. Wherein, the second protrusion 121 on the second single-sided area 122 is located on a side of the cell unit 130 facing the top edge seal 210.

It can be appreciated that the cell unit 130 has no negative active layer 125 between the side facing the top seal 210 and the protrusion 220, saving active material costs while ensuring energy density of the battery.

In one possible implementation, as shown in fig. 5, 7, and 9-14, the positive electrode tab 110 is provided with a positive electrode tab 113, the positive electrode tab 113 is disposed at a distance from the first protruding portion 111, the negative electrode tab 120 is provided with a negative electrode tab 123, the negative electrode tab 123 is disposed at a distance from the second protruding portion 121, and the positive electrode tab 113 and the negative electrode tab 123 protrude from the top sealing edge 210, respectively, by the packaging film 200.

Illustratively, one end of positive tab 113 is electrically connected to positive current collector 114 and one end of negative tab 123 is electrically connected to negative current collector 124. When the number of the first protrusions 111 and the second protrusions 121 is plural, respectively, the positive electrode tab 113 is located between the two first protrusions 111, and the negative electrode tab 123 is located between the two second protrusions 121.

Illustratively, after the positive electrode tab 110 and the negative electrode tab 120 are laminated and wound, the positive electrode tab 113 and the negative electrode tab 123 are disposed parallel to each other. After the positive electrode tab 113 and the negative electrode tab 123 extend out of the top sealing edge 210, the top sealing edge 210 and the corresponding electrode tab can be connected in a sealing manner through a packaging process.

In this structure, after the positive electrode sheet 110 and the negative electrode sheet 120 are laminated and wound, the positive electrode tab 113 and the negative electrode tab 123 of the battery cell 100 may extend from the top sealing edge 210, and the battery cell 100 may be electrically connected by aligning the positive electrode tab 113 and the negative electrode tab 123, so as to further realize charge and discharge of the battery.

Illustratively, the positive electrode tab 113 and the negative electrode tab 123 have a gap in the thickness direction of the top seal 210, the gap being less than or equal to 1mm.

It is understood that the positive tab 113 and the negative tab 123 are respectively located on different pole pieces, and when the positive pole piece 110 and the negative pole piece 120 are wound in a stacked manner, the positive tab 113 and the negative tab 123 have a gap in the direction indicated by the Y axis. Optionally, a fold of the positive electrode tab 110 provided with the positive electrode tab 113 is adjacent to a fold of the negative electrode tab 120 provided with the negative electrode tab 123 to reduce a gap between the positive electrode tab 113 and the negative electrode tab 123. The gap between the positive electrode tab 113 and the negative electrode tab 123 can be controlled by one skilled in the art by controlling the thickness of the positive electrode active layer 115 and the thickness of the negative electrode active layer 125.

With this structure, the gap between the positive electrode tab 113 and the negative electrode tab 123 does not exceed 1mm, and the top seal 210 can be ensured to reliably seal the positive electrode tab 113 and the negative electrode tab 123.

Illustratively, the positive tab 113 and the negative tab 123 are respectively coated with tab adhesive 140, and each tab adhesive 140 is in sealing connection with the top sealing edge 210.

Schematically, the tab adhesive 140 is located in the middle of the corresponding tab, and after the positive tab 113 and the negative tab 123 extend from the top edge seal 210, the tab adhesive 140 on the positive tab 113 is located between the positive tab 113 and the top edge seal 210, and the tab adhesive 140 on the negative tab 123 is located between the negative tab 123 and the top edge seal 210. The thickness of the tab adhesive 140 on the positive tab 113 and the negative tab 123 can be set by those skilled in the art as required, and is not limited only herein.

Through setting up utmost point ear glue 140, when the battery is packaged, positive electrode ear 113 and negative electrode ear 123 are sealed through utmost point ear glue 140 and top edge seal 210 between, and utmost point ear glue 140 can also avoid positive electrode ear 113 and negative electrode ear 123 and top edge seal 210 direct contact to take place the short circuit simultaneously.

In one embodiment, as shown in fig. 3 to 7, the battery cell 100 further includes a separator 150, the separator 150 is disposed between the positive electrode tab 110 and the negative electrode tab 120, a plurality of third protruding portions 151 are disposed at intervals on one side of the separator 150, and the third protruding portions 151 are disposed between the first protruding portion 111 and the second protruding portion 121.

The number of the diaphragms 150 may be one or a plurality. The third protruding portion 151 is located at one side in the width direction of the diaphragm 150, and the third protruding portion 151 may have a rectangular shape, and the distance between adjacent diaphragms 150 gradually increases in the winding direction of the diaphragm 150. Illustratively, the projection of the diaphragm 150 in the direction of the Y-axis covers the projection of the first protrusion 111 in the direction of the Y-axis and the projection of the second protrusion 121 in the direction of the Y-axis.

In one possible implementation, as shown in fig. 4 to fig. 7, when the polarities of the pole pieces at the two ends of the battery cell unit 130 are different, a third protruding portion 151 may be further disposed between the pole piece at the end of the battery cell unit 130 facing the top seal 210 and the protruding portion 220, where contact short circuit between the battery cell unit 130 and the protruding portion 220 may be avoided.

As shown in fig. 8, the convex portion 220 and the top seal 210 have a spacing H1 in the thickness direction of the top seal 210.

Specifically, the top seal 210 and the convex portion 220 have a spacing H1 in the Y-axis direction. Exemplary, H1 is greater than or equal to 0.5mm. It is understood that the top sealing edge 210 has a spacing from the cell 130 that is greater than H1.

It will be appreciated that after the cells 100 are placed in the packaging film 200, the top seal 210 may be formed at the ends of the packaging film 200 by heat sealing. By providing the space H1 between the protrusion 220 and the top sealing edge 210, the heat is not easily transferred to the battery cell unit 130 during the formation of the top sealing edge 210 at the end of the packaging film 200, ensuring the performance of the battery cell 100 and the battery.

The application also provides an electric device comprising the battery. The power consuming device may be, for example, a consumer electronic product. According to the power utilization device, the battery can store more energy due to higher energy density of the battery, so that the endurance time of the power utilization device is prolonged.

It should be noted that the above embodiments are merely for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A battery, comprising a battery cell and a packaging film wrapped around the outside of the battery cell;

The battery cell comprises a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and the negative electrode sheet are stacked and wound together, at least one first protrusion is arranged at intervals on one side of the positive electrode sheet, and at least one second protrusion is arranged at intervals on one side of the negative electrode sheet, and the first protrusion and the second protrusion are stacked alternately to define a battery cell unit;

The end of the packaging film is provided with a top sealing edge, one side of the top sealing edge is provided with a convex portion, the inner wall of the convex portion defines a containing cavity, and the battery cell unit is contained in the containing cavity.

2. The battery according to claim 1, characterized in that the size of the first protrusion in the first direction is smaller than or equal to the size of the top sealing edge in the first direction, and the size of the second protrusion in the first direction is smaller than or equal to the size of the top sealing edge in the first direction.

3 . The battery according to claim 2 , wherein the first protrusion and the second protrusion are both sheet-like structures parallel to the top sealing edge.

4. The battery according to claim 1 is characterized in that the positive electrode sheet is provided with a first single-sided area at the first end in the length direction of the positive electrode sheet, wherein one of the first protrusions is located in the first single-sided area, and the first protrusion on the first single-sided area is located at one end of the battery cell unit.

5. The battery according to claim 1 is characterized in that the negative electrode sheet is provided with a second single-sided area at the second end in the length direction of the negative electrode sheet, wherein one of the second protrusions is located in the second single-sided area, and the second protrusion on the second single-sided area is located at the other end of the battery cell unit.

6. The battery according to claim 1 is characterized in that the positive electrode sheet is provided with a positive electrode ear, and the positive electrode ear is spaced apart from the first protrusion, and the negative electrode sheet is provided with a negative electrode ear, and the negative electrode ear is spaced apart from the second protrusion, and the positive electrode ear and the negative electrode ear extend out of the packaging film from the top sealing edge respectively.

7 . The battery according to claim 6 , wherein the positive electrode tab and the negative electrode tab have a gap in the thickness direction of the top sealing edge, and the gap is less than or equal to 1 mm.

8 . The battery according to claim 6 , wherein the positive electrode lug and the negative electrode lug are respectively coated with lug glue, and each lug glue is sealed and connected to the top edge seal.

9. The battery according to any one of claims 1-8, characterized in that the battery cell further comprises a diaphragm, the diaphragm is arranged between the positive electrode sheet and the negative electrode sheet, a plurality of third protrusions are arranged at intervals on one side of the diaphragm, and the third protrusions are arranged between the first protrusions and the second protrusions.

10 . The battery according to claim 1 , wherein the convex portion and the top sealing edge are spaced apart in a thickness direction of the top sealing edge.

11. An electrical device, characterized in that it comprises the battery according to any one of claims 1 to 10.