CN115149080A

CN115149080A - Battery with a battery cell

Info

Publication number: CN115149080A
Application number: CN202210706648.5A
Authority: CN
Inventors: 董宇洋; 闫东阳; 曾巧
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2022-10-04
Also published as: CN113097436A; CN113097436B

Abstract

A battery includes a first electrode, a second electrode, a first layer, and a housing. The first electrode includes a first conductor having a first surface and a second surface, and a first metal plate connected to the first surface of the first conductor. The second electrode includes a second conductor having a third surface and a fourth surface, and a second metal plate connected to the third surface of the second conductor. The first layer includes an insulating material and is connected to the first surface of the first metal plate and the third surface of the second metal plate. The case includes a first portion and a second portion, and covers the first electrode, the second electrode, and at least a part of the first layer through the first portion and the second portion, the at least a part of the first portion being connected to the first layer.

Description

Battery with a battery cell

The application is a divisional application with the application number of 202110348027.X, the application date of 2021, 3 months and 31 days, and the invention name of the application is 'battery'.

Technical Field

The present application relates to the field of energy storage devices, and more particularly, to a battery.

Background

The current energy storage means mainly comprises three directions of electrochemical energy storage, mechanical energy storage and electromagnetic energy storage, and the electrochemical energy storage occupies a larger and larger proportion in the future energy storage field due to the characteristics of high energy density, long service life, high response speed and the like. In the soft package battery, the tab extending from the head of the battery core extends out of the packaging bag, and the structure can cause the problem of air tightness reduction of the packaging bag.

Disclosure of Invention

An object of the present application is to provide a battery that can suppress the occurrence of a phenomenon in which the airtightness of a case is reduced due to the arrangement of a first metal plate and a second metal plate.

Some embodiments of the present application provide a battery including a first electrode, a second electrode, a first layer, and a housing. The first electrode includes a first conductor having a first surface and a second surface, and a first metal plate connected to the first surface of the first conductor. The second electrode includes a second conductor having a third surface and a fourth surface, and a second metal plate connected to the third surface of the second conductor. The first layer includes an insulating material and is connected to the first surface of the first metal plate and the third surface of the second metal plate. The case includes a first portion and a second portion, and covers the first electrode, the second electrode, and at least a part of the first layer through the first portion and the second portion, at least a part of the first portion being connected to the first layer.

The first layer positioned between the first metal plate/the second metal plate and the shell is arranged, so that the first electrode and the second electrode in the shell are sealed, and the phenomenon that the air tightness of the shell is reduced due to the arrangement of the first metal plate and the second metal plate can be prevented; and through setting up the first layer that covers first metal sheet and second metal sheet, make the relative position of first metal sheet and second metal sheet fixed, first metal sheet and second metal sheet are difficult for inclining when receiving external force, can avoid influencing the condition of leakproofness because of the slope. In addition, the first layer having the one-piece shape prevents the first portion and the second portion of the case located between the first metal plate and the second metal plate from directly contacting each other, so that the difference in height at each location in the seal region is small, and the sealing property is further improved.

According to some embodiments of the application, the first layer includes a first region connected with the first portion and a second region connected with the second region and exiting the housing. The second area separated from the shell is arranged, so that the first layer is partially exposed out of the shell, the risk of the edge of the shell being pressed empty during packaging can be avoided, and sealing is facilitated.

According to some embodiments of the application, the first layer further comprises a third region connected to the second region and covered by the shell. By providing the third region, the first layer is caused to extend inwardly from the seal area, and the risk of narrowing the effective seal width due to the first layer not extending from the seal area into the housing interior can be avoided.

According to some embodiments of the present application, in the first layer, a length of the first region is less than a length of the second region in a first direction extending from the first region to the second region.

According to some embodiments of the present application, in the first layer, a length of the first region is greater than a length of the second region in a first direction extending from the first region to the second region. The shorter the length of the second region, the less it affects subsequent packaging.

According to some embodiments of the application, in the first layer, a length of the third region is less than a length of the second region in the first direction extending from the first region to the second region. The shorter the length of the third region is, the less the electrode assembly occupies the inner space of the case, and the energy density can be improved.

According to some embodiments of the present application, in the first layer, a length of the third region is greater than a length of the second region in a first direction extending from the first region to the second region.

According to some embodiments of the application, the first layer comprises a first area connected with the first portion and a third area connected with the first area and covered by the shell.

According to some embodiments of the application, a length of the first layer is less than a length of the housing in a second direction in which the first metal plate extends toward the second metal plate.

According to some embodiments of the present application, the first layer is formed by stacking one or more layers of material in a third direction perpendicular to the first surface of the first metal plate.

According to some embodiments of the application, the first layer is disposed apart from the first electrical conductor.

According to some embodiments of the present application, the battery further comprises a second layer comprising an insulating material, the second layer being connected to both the second surface of the first metal plate and the fourth surface of the second metal plate.

According to some embodiments of the present application, the first layer and the second layer are connected.

According to some embodiments of the present application, the first layer comprises a fourth region between the first metal plate and the second metal plate, the fourth region being connected to the second layer when viewed in a third direction perpendicular to the first surface of the first metal plate.

According to some embodiments of the application, the first layer further comprises a fifth area on a side of the first metal plate facing away from the fourth area and a sixth area on a side of the second metal plate facing away from the fourth area, at least one of the fifth area and the sixth area being connected to the second layer when viewed in a third direction perpendicular to the first surface of the first metal plate.

According to some embodiments of the present application, the first layer is connected to the second layer at least in the first area, when viewed in a third direction perpendicular to the first surface of the first metal plate.

According to some embodiments of the present application, the first layer is connected to the second layer at least in the second area, when viewed in a third direction perpendicular to the first surface of the first metal plate.

According to some embodiments of the application, the first layer comprises a first area connected with the first portion and a third area covered by the housing and being away from the first area.

According to some embodiments of the present application, the first layer is connected to the second layer at least in a third area when viewed in a third direction perpendicular to the first surface of the first metal plate.

According to some embodiments of the present application, the first layer comprises at least one of polyethylene, polypropylene, phenolic resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin, and polyurethane.

According to some embodiments of the present application, the second layer comprises at least one of polyethylene, polypropylene, phenolic resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin, and polyurethane.

According to some embodiments of the application, the first layer may pass visible light.

According to some embodiments of the present application, the second layer may pass visible light.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a side view of a battery provided in accordance with an embodiment of the present application;

FIG. 2 is a schematic front view of the cell shown in FIG. 1;

FIG. 3 is a schematic rear view of the battery shown in FIG. 1;

FIG. 4 is a partial schematic view of the cell shown in FIG. 1;

FIG. 5 is a cross-sectional view of the battery shown in FIG. 4 taken along line V-V;

fig. 6 is a cross-sectional view of a battery according to another embodiment of the present application;

FIG. 7 is a cross-sectional view of the cell shown in FIG. 4 taken along line VII-VII;

FIG. 8 is a cross-sectional view VIII-VIII of the cell shown in FIG. 4;

FIG. 9 is a schematic diagram of a first layer according to an embodiment of the present application;

fig. 10 is a partial structural view of a battery according to another embodiment of the present application;

FIG. 11 is a cross-sectional view of the cell shown in FIG. 10 taken along line XI-XI;

fig. 12 is a partial structural view of a battery according to another embodiment of the present application;

FIG. 13 is a cross-sectional view of the battery of FIG. 12 taken along XIII-XIII;

fig. 14 is a schematic view showing the structure of a battery of comparative example 1 of the present application.

Description of the main elements

Battery 100

Housing 10

Electrode assembly 20

First layer 30

Second layer 40

First part 11

Second part 12

Accommodating cavity 14

First metal plate 214

Second metal plate 224

First surface 214a

Second surface 214b

Third surface 224a

Fourth surface 224b

First electrode 21

First side 211a

Second surface 211b

Third surface 221a

Fourth surface 221b

Second electrode 22

Isolation diaphragm 23

First conductor 211

First conductive material layer 212

First tab 213

Adapter plate 24

Second conductor 221

Second tab 223

Second conductive material layer 222

First region 31

Second region 32

First region 11a

Second region 11b

Third region 12a

Fourth region 12b

Third region 33

Fourth region 34

Fifth region 35

Sixth area 36

Substrate 301

Adhesive layer 303

Third layer 210

End point 11aa

First overlapping portion 30a

The second overlapping portion 30b

First overlap region 34a

Second overlap area 34b

Third overlapping area 34c

Fourth overlap area 35a

Fifth overlapping area 35b

Sixth overlapping area 35c

Seventh overlap area 36a

Eighth overlap area 36b

Ninth overlap area 36c

Detailed Description

The technical solutions in the embodiments of the present application are described in detail below clearly, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. Unless defined otherwise, all 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. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Hereinafter, embodiments of the present application will be described in detail. This application may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and detailed, and will fully convey the scope of the disclosure to those skilled in the art.

In addition, the dimensions or thicknesses of various components, layers, or layers may be exaggerated in the figures for clarity and simplicity. Like numbers refer to like elements throughout. As used herein, the term "and/or", "and/or" includes any and all combinations of one or more of the associated listed items. In addition, it will be understood that when element a is referred to as being "connected" element B, element a may be directly connected to element B, or intervening elements C may be present and element a and element B may be indirectly connected to one another.

Further, the use of "may" when describing embodiments of the present application refers to "one or more embodiments of the present application.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting of the application. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, values, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, values, steps, operations, elements, components, and/or groups thereof.

Spatially relative terms, such as "upper" and the like, may be used herein for convenience in description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device or apparatus in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" other elements or features would then be oriented "below" or "lower" the other elements or features. Thus, the exemplary term "up" can include both an orientation of above and below. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

In this application, the X direction refers to a direction extending from the first region of the first layer to the second region, the Y direction refers to a direction extending from the first metal plate to the second metal plate, the Z direction refers to a direction perpendicular to the first surface of the first metal plate, and the three directions X, Y, Z are perpendicular to each other.

Referring to fig. 1 to 3, a battery 100 according to an embodiment of the present disclosure includes a case 10, an electrode assembly 20, an electrolyte (not shown), a first layer 30, and a second layer 40.

The housing 10 includes a first portion 11 and a second portion 12 disposed opposite each other. The first part 11 and the second part 12 are shaped to fit. The first portion 11 comprises a first zone 11a and a second zone 11b connected to each other. The first zone 11a is connected to the second portion 12, and the second zone 11b is surrounded on three sides by the first zone 11 a. The second region 11b covers the electrode assembly 20 when viewed from the Z direction. The second portion 12 includes a third region 12a and a fourth region 12b that are interconnected. The third zone 12a is connected to the first portion 11 and the fourth zone 12b is surrounded on three sides by the third zone 12 a. The fourth region 12b covers the electrode assembly 20 when viewed from the Z direction. The second region 11b of the first portion 11 and the fourth region 12b of the second portion 12 together form a receiving cavity 14 for receiving the electrolyte, a portion of the electrode assembly 20, and at least a portion of the first layer 30 and the second layer 40. The case 10 may be a packaging bag obtained by packaging with a packaging film, that is, the battery 100 is a pouch battery.

In some embodiments, the encapsulation film for forming the case 10 includes a protective layer, a metal layer, and an encapsulation layer, which are sequentially stacked, the encapsulation layer being adjacent to the electrode assembly 20, and the protective layer being remote from the electrode assembly 20. The protective layer is made of polymer resin and is used for protecting the metal layer, preventing the metal layer from being damaged due to the action of external force, preventing air permeation of the external environment and maintaining the interior of the battery 100 in an anhydrous and oxygen-free environment. The metal layer is made of metal, such as aluminum or steel, and is used to prevent moisture permeation from the external environment and prevent damage to the battery 100 due to external force. The material of the encapsulation layer is a polymer, such as polypropylene, polyamide, and the like, and is used for encapsulating the encapsulation film and preventing the encapsulation film from being dissolved or swelled by an organic solvent in an electrolyte, and the encapsulation layer is also used for preventing the electrolyte in the electrolyte from contacting with the metal layer to corrode the metal layer. When the case 10 is prepared, the packaging film may be folded in half, and then a heat-sealing end is used to apply a certain temperature and pressure to the surface of the folded packaging film for heat-sealing, so that the packaging layers of the packaging film are fused and connected. At this time, the innermost layer of the case 10 is an encapsulation layer. In other embodiments, the battery 100 is not limited to a pouch battery, but may be a steel-case battery or an aluminum-case battery, and the like, and the present application is not limited thereto.

The electrode assembly 20 includes a first metal plate 214 and a second metal plate 224. The first metal plate 214 and the second metal plate 224 each penetrate through one end of the housing 10 to connect with an external element. The first metal plate 214 includes a first surface 214a facing the first portion 11 and a second surface 214b facing the second portion 12. The second metal plate 224 includes a third surface 224a facing the first portion 11 and a fourth surface 224b facing the second portion 12.

The first layer 30 is a sheet-shaped member covering at least a portion of the first surface 214a of the first metal plate 214 and at least a portion of the third surface 224a of the second metal plate 224 and connected to each of the first surface 214a, the third surface 224a, and at least a portion of the first portion 11. The material of the first layer 30 includes an insulating material selected from at least one of polyethylene, polypropylene, phenol resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin, and polyurethane.

The first layer 30 has a higher degree of adhesion with the metal plate than the casing 10, and since the metal plate is subjected to a heating and pressing process for a relatively short time during the packaging process, if the first layer 30 is not disposed between the casing 10 and the metal plate, a gap may exist between the metal plate and the casing 10, or the first layer may be separated from the casing 10 in a subsequent life cycle, which seriously affects the sealing performance. And the first layer 30 and the packaging layer of the casing 10 can be made of polymers, so that the melting points are relatively close, the combination degree is relatively good in a high-temperature pressurizing environment, and the sealing property can be improved.

The second layer 40 is in the form of a sheet that covers at least a portion of the second surface 214b of the first metal plate 214 and at least a portion of the fourth surface 224b of the second metal plate 224 and is bonded to at least a portion of each of the second surface 214b, the fourth surface 224b, and the second portion 12. The material of the second layer 40 includes an insulating material selected from at least one of polyethylene, polypropylene, phenol resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin, and polyurethane.

In some embodiments, the first layer 30 can pass visible light and the second layer 40 can pass visible light.

Referring to fig. 5, the electrode assembly 20 includes a first electrode 21, a second electrode 22, and a separator 23, wherein the separator 23 is disposed between the first electrode 21 and the second electrode 22. The separator 23 serves to prevent the first electrode 21 and the second electrode 22 from being directly contacted, thereby preventing the electrode assembly 20 from being short-circuited. The electrolyte is used to wet the first electrode 21, the second electrode 22, and the separator 23. In fig. 5, the electrode assembly 20 is a wound structure, that is, the first electrode 21, the separator 23, and the second electrode 22 are sequentially wound in layers to form the electrode assembly 20. In other embodiments, the electrode assembly 20 may also be a lamination stack, that is, the first electrode 21, the separator 23, and the second electrode 22 are sequentially stacked to form the electrode assembly 20, which is not limited in this application.

The first electrode 21 includes a first electrical conductor 211, a first conductive material layer 212, a first tab 213, and a first metal plate 214. The first conductor 211 includes a first surface 211a and a second surface 211b disposed opposite to each other. The first side 211a and the second side 211b each include a region provided with the first conductive material layer 212 and a region away from the first conductive material layer 212. The material of the first conductive material layer 212 may be an active material, for example, selected from LiCoO ₂ 、LiFeP0 ₄ And the like can be used for removing one or more of the electrochemical active substances capable of absorbing lithium ions. The first tab 213 is welded to the first surface 211a of the first conductor 211 and connected to the first surface 214a of the first metal plate 214. In other embodiments, the first tab 213 may be formed by extending an end of the first surface 211a located away from the first conductive material layer 212 and connected to the first surface 214a of the first metal plate 214, which is not limited in this application. One end of the first metal plate 214 is connected to the first tab 213, and the other end thereof extends out of the case 10 from one end of the case 10. The first metal plate 214 is connected to the first electrode 21 in the case 10, and the first metal plate 214 extends outside the case 10 through the first region 11a in the second region 11b when viewed from the Z direction.

Referring to fig. 6, another embodiment of the present application provides a battery, which is different from the battery shown in fig. 5 in that: the first electrode 21 includes a plurality of first tabs 213, and each of the first tabs 213 is formed by extending one end of the first face 211a away from the area of the first conductive material layer 212 and is connected to the first surface 214a of the first metal plate 214 through the interposer 24.

Referring to FIG. 7, the second electrode 22 includes a second conductor 221 and a second conductive materialA layer 222, a second tab 223 and a second metal plate 224. The second conductor 221 includes a third surface 221a and a fourth surface 221b that are disposed opposite to each other. The third and

fourth faces

221a and 221b each include a region provided with the second conductive material layer 222 and a region away from the second conductive material layer 222. The material of the second conductive material layer 222 may be an active material, and may be selected from graphite, soft carbon, hard carbon, and Li ₄ Ti ₅ 0 ₁₂ One or more of the electrochemical active materials capable of intercalating lithium ions. The second tab 223 is formed by extending outwardly from an end located away from the third face 221a of the second conductive material layer 222, and is connected to the third face 224a of the second metal plate 224. In other embodiments, the second tab 223 can be soldered to the third surface 221a of the second conductor 221, which is not limited in this application. One end of the second metal plate 224 is connected to the second pole ear 223, and the other end thereof extends out of the case 10 from one end of the case 10. The second metal plate 224 is connected to the second electrode 22 in the case 10, and the second metal plate 224 extends outside the case 10 through the first region 11a in the second region 11b when viewed from the Z direction.

The housing 10 covers a portion of the first electrode 21, a portion of the second electrode 22, at least a portion of the first layer 30, and at least a portion of the second layer 40 by the first portion 11 and the second portion 12.

Referring to fig. 4, 5 and 7, the first layer 30 includes a first region 31 connected to the first portion 11 located in the first region 11a, a second region 32 connected to the first region 31 and located outside the housing 10, and a third region 33 connected to the first region 31 and located in the receiving cavity 14. Specifically, the first region 31 is a region of the first layer 30, which coincides with the first region 11a of the first portion 11 in the orthogonal projection along the Z direction and is interposed between the first region 11a of the first portion 11 and the third region 12a of the second portion 12 in the Z direction; the second region 32 is a region of the first layer 30 which is connected to the first region 31 and is farther from the housing 10 than the end point 11aa of the first portion 11 in the X direction when viewed from the Z direction; the third region 33 is a region of the first layer 30 that is connected to the first region 31 and is closer to the inside of the housing 10 than the end point 11aa of the first portion 11 in the X direction when viewed from the Z direction. In some embodiments, in the first layer 30, the length of the first region 31 is greater than the length of the second region 32, and the length of the third region 33 is greater than the length of the first region 31, along the X-direction. The shorter the length of the second region 32, the less it affects subsequent packaging. The length of the first layer 30 in the Y direction is less than the length of the housing 10. In some embodiments, the length of the first layer 30 is less than the length of the second region 11b along the Y-direction.

Referring to fig. 4 and 8, in the Y direction, the first layer 30 and the second layer 40 both cover the first metal plate 214 and the second metal plate 224 and both extend a distance in the Y direction and a direction opposite to the Y direction. First layer 30 also includes a fourth region 34 located between first metal plate 214 and second metal plate 224, a fifth region 35 located on a side of first metal plate 214 facing away from fourth region 34, and a sixth region 36 located on a side of second metal plate 224 facing away from fourth region 34. When viewed in the Z direction, the first layer 30 and the first metal plate 214 have a first overlapping portion 30a that overlaps, and the first layer 30 and the second metal plate 224 have a second overlapping portion 30b that overlaps. The first overlapping portion 30a includes a portion of the first area 31, a portion of the second area 32, and a portion of the third area 33 that cover the first surface 214a, and the second overlapping portion 30b includes a portion of the first area 31, a portion of the second area 32, and a portion of the third area 33 that cover the third surface 224 a. The fourth region 34 connects the first overlap portion 30a and the second overlap portion 30b. The fifth area 35 is connected to a side of the first overlap portion 30a facing away from the fourth area 34. The sixth area 36 is connected to a side of the second overlapping portion 30b facing away from the fourth area 34. The fourth region 34 has first, second, and third overlapping

regions

34a, 34b, and 34c that overlap with the first, second, and

third regions

31, 32, and 33, respectively, the fifth region 35 has fourth, fifth, and sixth overlapping

regions

35a, 35b, and 35c that overlap with the first, second, and

third regions

31, 32, and 33, respectively, and the sixth region 36 has seventh, eighth, and ninth overlapping

regions

36a, 36b, and 36c that overlap with the first, second, and

third regions

31, 32, and 33, respectively, when viewed in the Z direction. The first layer 30 and the second layer 40 have joined portions. In some embodiments, the fourth region 34 is connected to the second layer 40 and at least one of the fifth region 35 and the sixth region 36 is connected to the second layer 40 when viewed in the Z-direction. In some embodiments, the fifth region 35 and the sixth region 36 are both connected to the second layer 40. Wherein the fourth area 34 is connected to the second layer 40 at least one of the first 34a, second 34b and third 34c overlapping areas, the fifth area 35 is connected to the second layer 40 at least one of the fourth 35a, fifth 35b and sixth 35c overlapping areas, and the sixth area 36 is connected to the second layer 40 at least one of the seventh 36a, eighth 36b and ninth 36c overlapping areas. The fourth region 34 covers one side wall of the first metal plate 214 connecting the first surface 214a and the second surface 214b and one side wall of the second metal plate 224 connecting the third surface 224a and the fourth surface 224b, the fifth region 35 covers the other side wall of the first metal plate 214, and the sixth region 36 covers the other side wall of the second metal plate 224, that is, both side walls of the first layer 30 and the first metal plate 214 and the second metal plate 224 are in close contact, whereby the occurrence of a phenomenon in which the airtightness of the case 10 is decreased due to the arrangement of the first metal 214 and the second metal plate 224 therein can be suppressed. In some embodiments, second layer 40 is in intimate contact with both sidewalls of first metal plate 214 and second metal plate 224.

In other embodiments, first layer 30 is joined to second layer 40 at first region 31 when viewed along the Z-direction. In other embodiments, first layer 30 is joined to second layer 40 at second region 32 when viewed along the Z-direction.

Referring to fig. 9, the first layer 30 is formed by stacking one or more layers of material in the Z-direction. In some embodiments, the first layer 30 is formed from a stack of two layers of material, including a substrate 301 and an adhesive layer 303. The material of the substrate 301 may be at least one of polyethylene terephthalate, polyimide, and polyamideimide. The material of the adhesive layer 303 may be at least one of polyethylene, polypropylene, phenol resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin, and polyurethane. The adhesive layer 303 is bonded to the first metal plate and the second metal plate, and the base material 301 and the sealing layer of the case 10 have portions welded to each other.

Referring to fig. 10 and 11, in some embodiments, in the first layer 30, the length of the first region 31 is smaller than the length of the second region 32 along the X direction.

Referring to fig. 11 and 12, in some embodiments, in the first layer 30, the length of the first region 31 is greater than the length of the third region 33 along the X direction. The shorter the length of the third region 33, the less the electrode assembly 20 occupies the inner space of the case 10, and the energy density can be improved.

The present application accomplishes the sealing of the first electrode 21 and the second electrode 22 within the housing 10 by providing the first layer 30/second layer 40 between the first metal plate 214/second metal plate 224 and the housing 10; and the relative positions of the first metal plate 214 and the second metal plate 224 are fixed by arranging the first layer 30 and the second layer 40 which both cover the first metal plate 214 and the second metal plate 224, so that the first metal plate 214 and the second metal plate 224 are not easy to incline when external force is applied, and the condition that the sealing performance is influenced by the inclination can be avoided. In addition, the first layer 30 and the second layer 40 having the one-piece form prevent the first portion 11 and the second portion 12 of the case 10 located between the first metal plate 214 and the second metal plate 224 from being in direct contact with each other, so that the difference in height at each location in the seal region is small, and the sealing property is further improved.

The present application will be described in detail below with reference to specific examples and comparative examples.

Example 1

The first layer and the second layer are connected with the first metal plate and the second metal plate for rubberizing, then the first metal plate and the second metal plate are respectively welded with the first pole lug and the second pole lug, and the sequence of rubberizing procedures and welding procedures can be exchanged. The first electrode, the second electrode and the separator are then wound together to obtain an electrode assembly. Then, the electrolyte is injected, formed and packaged to obtain the battery shown in fig. 2.

Comparative example 1

The difference from embodiment 1 is that, referring to fig. 13, two third layers 210 are respectively connected to the first metal plate 214 and the second metal plate 224 for gluing. The third layer 210 includes an insulating material.

100 cells of each of the examples and comparative examples were tested, and then the product quality of each cell was counted and the results were recorded in table 1.

TABLE 1

	Ratio of excellence of finished product
		Example 1	98％
Comparative example 1	87％

As can be seen from the data in table 1, the product quality ratio of example 1 is higher than that of comparative example 1, the relative positions of the first metal plate 214 and the second metal plate 224 are fixed by connecting both the first layer 30 and the second layer 40 to the first metal plate 214 and the second metal plate 224, and this technical solution has a good effect of suppressing the inclination of the first metal plate 214 and the second metal plate 224 when an external force is applied, thereby improving the sealing property and improving the product quality ratio. In contrast, in comparative example 1, the two third layers 210 are respectively attached to the first metal plate 214 and the second metal plate 224, and when an external force is applied, the effect of preventing the first metal plate 214 and the second metal plate 224 from inclining is insufficient (as shown in fig. 13), so that the sealing performance is affected, and the product quality is reduced.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention.

Claims

1. A battery comprising a first electrode, a second electrode, a first layer, and a housing, wherein:

the first electrode comprises a first conductor with a first surface and a second surface and a first metal plate connected with the first surface of the first conductor, wherein the first metal plate comprises a first surface and a second surface which are oppositely arranged;

the second electrode comprises a second conductor with a third surface and a fourth surface and a second metal plate connected with the third surface of the second conductor, and the second metal plate comprises a third surface and a fourth surface which are oppositely arranged;

the first layer comprises an insulating material and has a monolithic morphology, the first layer being connected with the first surface and the third surface;

the case includes a first portion and a second portion, and covers the first electrode, the second electrode, and at least a part of the first layer through the first portion and the second portion, the at least a part of the first portion being connected to the first layer;

the first surface and the third surface both face the first portion, and the second surface and the fourth surface both face the second portion.

2. The battery of claim 1, wherein the first layer includes a first region connected to the first portion and a second region connected to the first region and spaced apart from the housing.

3. The battery of claim 1, wherein the first layer includes a first region connected to the first portion and a third region connected to the first region and covered by the housing.

4. The battery of claim 2, wherein the first layer further comprises a third region connected to the first region and covered by the housing.

5. The battery of claim 2, wherein in the first layer, a length of the first region is less than a length of the second region in a first direction extending from the first region to the second region.

6. The battery of claim 2, wherein a length of the first region is greater than a length of the second region in the first layer in a first direction extending from the first region to the second region.

7. The battery of claim 4, wherein in the first layer, a length of the third region is less than a length of the second region in a first direction extending from the first region to the second region.

8. The battery of claim 4, wherein the third region has a length greater than a length of the second region in the first layer in a first direction extending from the first region to the second region.

9. The battery of claim 1, wherein a length of the first layer is less than a length of the case in a second direction in which the first metal plate extends toward the second metal plate.

10. The battery of claim 1, wherein the first layer is formed from one or more layers of material stacked in a third direction perpendicular to the first surface.

11. The battery of claim 1, wherein the first layer is disposed away from the first electrical conductor.

12. The battery of claim 1, further comprising a second layer comprising an insulating material, the second layer being connected to both the second surface and the fourth surface.

13. The battery of claim 12, wherein the first layer and the second layer are connected.

14. The battery of claim 13, wherein the first layer includes a fourth region between the first metal plate and the second metal plate, the fourth region being connected to the second layer when viewed in a third direction perpendicular to the first surface.

15. The battery of claim 14, wherein the first layer further comprises a fifth region on a side of the first metal plate facing away from the fourth region and a sixth region on a side of the second metal plate facing away from the fourth region, at least one of the fifth region and the sixth region being connected to the second layer when viewed in a third direction perpendicular to the first surface.

16. The battery of claim 13, wherein the first layer includes a first region connected to the first portion and a second region connected to the first region and spaced apart from the housing.

17. The battery of claim 16, wherein the first layer is connected to the second layer at least in the first region when viewed in a third direction perpendicular to the first surface.

18. The battery of claim 16, wherein the first layer is connected to the second layer at least at the second region when viewed in a third direction perpendicular to the first surface.

19. The battery of claim 13, wherein the first layer includes a first region connected to the first portion and a third region connected to the first region and covered by the housing.

20. The battery of claim 19, wherein the first layer is connected to the second layer at least in the third region when viewed in a third direction perpendicular to the first surface.

21. The battery of claim 1, wherein the first layer comprises at least one of polyethylene, polypropylene, phenolic resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin, and polyurethane.

22. The battery of claim 12, wherein the second layer comprises at least one of polyethylene, polypropylene, phenolic resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin, and polyurethane.

23. The battery of claim 1 wherein the first electrode includes a plurality of first tabs formed by extending one end of the first electrical conductor outwardly and connected to the first metal plate.

24. The battery of claim 23, wherein the first plurality of tabs are coupled to the first surface.

25. The battery of claim 1, wherein the first layer comprises a substrate and an adhesive layer bonded to the first surface and the third surface.

26. The battery of claim 1, wherein the battery is a pouch battery.

27. An electrical device comprising a battery as claimed in any one of claims 1 to 26.