CN217903187U

CN217903187U - Winding type battery cell and battery

Info

Publication number: CN217903187U
Application number: CN202222008165.6U
Authority: CN
Inventors: 梁金云; 何润斌
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2022-08-01
Filing date: 2022-08-01
Publication date: 2022-11-25
Anticipated expiration: 2032-08-01

Abstract

The application discloses coiling type electric core and battery, this coiling type electric core includes: the diaphragm comprises a first pole piece, a first diaphragm, a second pole piece and a second diaphragm, wherein the first pole piece, the first diaphragm, the second pole piece and the second diaphragm are alternately overlapped and wound; the first pole piece comprises a first pole piece body and a plurality of first pole lugs, and each circle of the first pole piece body is provided with the first pole lug; in the first tabs of two adjacent circles, the orthographic projection of the first tab positioned on the outer circle on the first tab positioned on the inner circle is positioned in the first tab; the second pole piece comprises a second pole piece body and a plurality of second pole lugs, each circle of the second pole piece body is provided with the second pole lugs, and the second pole lugs and the first pole lugs are arranged at intervals. The problem of fracture appears when the utmost point ear welding can be improved.

Description

Winding type battery cell and battery

Technical Field

The application relates to the technical field of batteries, in particular to a winding type battery cell and a battery.

Background

In recent years, a new energy industry mainly for lithium ion batteries has been rapidly developed, and a manufacturing technology of lithium ion batteries has been gradually developed from original circular winding and square lamination to current square winding. When the square winding method is used for preparation, in order to provide energy density, a multi-tab die cutting mode is generally adopted in the industry for processing the pole piece.

When the method is adopted, the lugs are aligned in the method generally adopted at the present stage, but because the lengths of the lugs of the existing battery cell pole piece are designed to be equal, the free ends of the lugs are seriously staggered when the lugs are mutually bound and welded, so that the welding effect of the lugs is influenced, and the yield of the battery is reduced.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present application and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a main aim at provides a coiling formula electricity core, appears cracked problem when can improving utmost point ear welding.

In order to achieve the purpose of the application, the following technical scheme is adopted in the application:

according to an aspect of the present application, there is provided a wound cell comprising: the diaphragm comprises a first pole piece, a first diaphragm, a second pole piece and a second diaphragm, wherein the first pole piece, the first diaphragm, the second pole piece and the second diaphragm are alternately overlapped and wound; wherein the content of the first and second substances,

the first pole piece comprises a first pole piece body and a plurality of first pole lugs, and each circle of the first pole piece body is provided with the first pole lug; in the first tabs of two adjacent circles, the orthographic projection of the first tab positioned on the outer circle on the first tab positioned on the inner circle is positioned in the first tab;

the second pole piece comprises a second pole piece body and a plurality of second pole lugs, each circle of the second pole piece body is provided with the second pole lugs, and the second pole lugs and the first pole lugs are arranged at intervals.

In the winding type battery cell provided by the embodiment, the first pole piece includes a first pole piece body and a plurality of first pole lugs, and each circle of the first pole piece body is provided with a first pole lug; the second pole piece comprises a second pole piece body and a plurality of second pole lugs, each circle of the second pole piece body is provided with the second pole lug, and the plurality of second pole lugs and the plurality of first pole lugs are arranged at intervals; when the first tab is welded with the current collecting plate subsequently, in the first tabs of two adjacent rings, the orthographic projection of the first tab positioned on the outer ring on the first tab positioned on the inner ring is positioned in the first tab, namely the width of the first tab positioned on the outer ring in the winding direction is less than or equal to the width of the first tab positioned on the inner ring; after the first pole lug at the innermost ring is abutted with the current collecting plate, the first pole lug positioned at the inner ring is arranged between the first pole lug positioned at the outer ring and the current collecting plate, so that the first pole lug positioned at the outer ring and the current collecting plate cannot have suspended parts; therefore, when a plurality of first tabs are welded with the current collecting piece, for example, ultrasonic welding is carried out, the first tabs cannot be torn due to the existence of the suspended part, so that the scrapping of the battery cell is avoided, and the product yield is improved.

According to an embodiment of the application, in the second electrode lug of two adjacent circles, the orthographic projection of the second electrode lug on the second electrode lug positioned in the inner circle is positioned in the second electrode lug.

When the second tab is welded with the current collector in the following, in the two adjacent circles of second tabs, an orthographic projection of the second tab located in the outer circle on the second tab located in the inner circle is located in the second tab, that is, the width of the second tab located in the outer circle in the winding direction is less than or equal to the width of the second tab located in the inner circle; after the second pole lug at the innermost ring is abutted to the current collecting piece, the second pole lugs positioned at the inner ring are arranged between the second pole lug positioned at the outer ring and the current collecting piece, so that the second pole lugs positioned at the outer ring and the current collecting piece cannot have suspended parts; therefore, when a plurality of second tabs are welded with the current collecting piece, for example, ultrasonic welding is carried out, the second tabs cannot be torn due to the existence of the suspended part, so that the scrapping of the battery cell is avoided, and the product yield is improved

According to an embodiment of the present application, a plurality of first utmost point ears deviate from the one end parallel and level of second utmost point ear.

In the winding type battery cell provided by the embodiment, one end of each of the plurality of first tabs, which is deviated from the second tab, is flush, so that when the first tabs are welded with the current collecting piece subsequently, on one hand, the first tabs located in the inner ring are ensured to be arranged between the first tabs located in the outer ring and the current collecting piece after the first tabs located in the innermost ring are abutted to the current collecting piece, and the first tabs located in the outer ring and the current collecting piece cannot have suspended parts; on the other hand, the width of the first pole lug positioned on the outer ring is close to that of the first pole lug positioned on the inner ring as much as possible, so that the first pole lug positioned on the outer ring and the current collecting plate are ensured to have enough welding area, and the welding strength and the current carrying capacity are ensured.

According to an embodiment of the application, one end of the first tabs, which is close to the second tabs, is stepped.

This embodiment provides a coiling type battery cell, one end through making a plurality of first utmost point ears be close to the second utmost point ear is the step form, promptly on the winding direction of first pole piece, the width of a plurality of first utmost point ears can decrease progressively in proper order to guarantee to convolute and form the first utmost point ear of two adjacent circles behind the electric core, the orthographic projection of the first utmost point ear that is located the outer lane on the first utmost point ear that is located the inner circle is located first utmost point ear.

According to an embodiment of the present application, the plurality of second tabs are flush with an end of the first tab facing away from the first tab.

In the winding type battery cell provided by the embodiment, the plurality of second tabs are parallel and level with one end of the first tab, and when the second tabs are welded with the current collecting piece subsequently, on one hand, after the second tab at the innermost ring is abutted to the current collecting piece, the second tabs at the inner ring are arranged between the second tabs at the outer ring and the current collecting piece, so that the second tabs at the outer ring and the current collecting piece cannot have suspended parts; on the other hand, the width of the second tab positioned on the outer ring is as close as possible to the width of the second tab positioned on the inner ring, so that the second tab positioned on the outer ring and the current collecting plate are ensured to have enough welding area, and the welding strength and the current carrying capacity are ensured.

According to an embodiment of the present application, one end of the plurality of second tabs near the first tab is stepped.

The winding type battery cell provided by the embodiment has the advantages that one end of each of the second pole lugs, which is close to the first pole lug, is stepped, namely, the width of each of the second pole lugs can be gradually decreased in the winding direction of the second pole lug, so that the orthographic projection of the second pole lug positioned on the outer ring on the second pole lug positioned on the inner ring is positioned in the second pole lug in two adjacent circles of second pole lugs after the battery cell is formed through winding.

According to an embodiment of the present application, the heights of the plurality of first tabs in the axial direction of the winding type battery cell are the same, and the heights of the plurality of second tabs in the axial direction of the winding type battery cell are the same.

In the winding type battery cell provided by the embodiment, the heights of the plurality of first pole lugs and the plurality of second pole lugs in the axial direction of the winding type battery cell are respectively the same, so that the processing efficiency of the first pole piece and the second pole piece is improved; when the current collector is welded subsequently, the height of the first lug on the outer ring is as close as possible to the height of the first lug on the inner ring, and the height of the second lug on the outer ring is as close as possible to the height of the second lug on the inner ring, so that the first lug on the outer ring has enough welding area relative to the first lug on the inner ring and the current collector, and the second lug on the outer ring has enough welding area relative to the second lug on the inner ring and the current collector, thereby ensuring the welding strength and the current carrying capacity.

According to an embodiment of the present application, on the end surface of the winding type battery cell, the plurality of first tabs and the plurality of second tabs are close to the same side of the end surface.

This embodiment provides a coiling type electricity core, through making a plurality of first utmost point ears and a plurality of second utmost point ears close to the same side of end face, be convenient for follow-up a plurality of first utmost point ears and a plurality of second utmost point ear position and current-collecting plate are connected.

According to an embodiment of the present application, the first tabs and the second tabs are trapezoidal.

In the winding type battery cell provided by the embodiment, the plurality of first tabs are trapezoidal, and the width of the connecting position of the first tabs and the first pole piece body is larger, so that the connecting strength of the first tabs and the first pole piece body is improved; the width of the connecting position of the second pole lug and the second pole piece body is larger by making the plurality of second pole lugs trapezoidal, so that the connecting strength of the second pole lugs and the second pole piece body is improved.

According to one aspect of the application, a battery is provided, and the battery comprises the winding type battery cell.

According to the battery provided by the embodiment, the first tab can not be torn due to the existence of the suspended part at least when being subjected to ultrasonic welding with the current collecting piece, so that the scrapping of the battery cell is avoided, and the product yield is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic view of a wound battery cell according to an embodiment of the present application;

fig. 2 is a front view of a wound cell according to an embodiment of the present application;

fig. 3 is a schematic view of a first tab provided in an embodiment of the present application;

fig. 4 is a schematic view of a second tab provided in an embodiment of the present application.

Description of reference numerals:

10. a cell main body; 20. a first tab; 30. and a second tab.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

The embodiment of this application provides a coiling type battery cell at first, as shown in fig. 1 and fig. 2, coiling type battery cell includes: the battery cell comprises a first pole piece, a first diaphragm, a second pole piece and a second diaphragm, wherein the first pole piece, the first diaphragm, the second pole piece and the second diaphragm are alternately overlapped and wound to form a battery cell main body 10.

The first pole piece comprises a first pole piece body and a plurality of first pole lugs 20, and each circle of the first pole piece body is provided with the first pole lug 20; in the first tabs 20 of two adjacent circles, an orthographic projection of the first tab 20 located in the outer circle on the first tab 20 located in the inner circle is located in the first tab 20, that is, the orthographic projection of the first tab 20 located in the outer circle on a plane perpendicular to the first tab 20 located in the inner circle is located in the first tab 20 of the inner circle. The second pole piece comprises a second pole piece body and a plurality of second pole ears 30, each circle of the second pole piece body is provided with the second pole ears 30, and the second pole ears 30 and the first pole ears 20 are arranged at intervals.

In the winding type battery cell provided by the application, the first pole piece comprises a first pole piece body and a plurality of first pole lugs 20, and each circle of the first pole piece body is provided with a first pole lug 20; the second pole piece comprises a second pole piece body and a plurality of second pole ears 30, each circle of the second pole piece body is provided with the second pole ears 30, and the second pole ears 30 and the first pole ears 20 are arranged at intervals; when the first tab 20 is subsequently welded with a current collecting plate, because of the orthographic projection of the first tab 20 positioned on the outer ring on the first tab 20 positioned on the inner ring in the first tab 20 of two adjacent rings, the width of the first tab 20 positioned on the outer ring in the winding direction is less than or equal to the width of the first tab 20 positioned on the inner ring; after the first tab 20 at the innermost ring is abutted to the current collecting piece, the first tabs 20 at the inner ring are arranged between the first tabs 20 at the outer ring and the current collecting piece, so that the first tabs 20 at the outer ring and the current collecting piece cannot have suspended parts; therefore, when a plurality of first utmost point ears 20 and current collector weld, for example when carrying out ultrasonic bonding, the too big corner to rolling up core main part 10 of dislocation can not appear in first utmost point ear 20, can not appear tearing phenomenon because of having unsettled part to avoid electric core to scrap, improve the excellent rate of coiling, improved the product yield, thereby reduce the manufacturing cost of battery.

In an embodiment of the present application, as shown in fig. 1, one first tab 20 is provided on each circle of the first pole piece body, and of two adjacent circles of the first tabs 20, an orthographic projection of the first tab 20 located at the outer circle on the first tab 20 located at the inner circle is located in the first tab 20. Each circle of the second pole piece body is provided with a second pole ear 30. Of course, two, three or more first electrode tabs 20 are arranged on each circle of the first pole piece body, and two, three or more second electrode tabs 30 are arranged on each circle of the second pole piece body, which is not limited in this application.

In the following, the embodiments are exemplified by a first tab 20 provided on each turn of the first pole piece body, and a second tab 30 provided on each turn of the second pole piece body. The embodiment that a plurality of tabs are arranged on each ring can be realized by repeatedly arranging a plurality of tabs in the embodiment that one tab is arranged on each ring.

In one embodiment of the present application, as shown in fig. 3, the ends of the plurality of first tabs 20 facing away from the second tabs 30 are flush. One end of each of the first tabs 20, which is far away from the second tab 30, is flush, so that when the first tabs 20 are subsequently welded with the current collecting plate, on one hand, after the first tab 20 at the innermost ring is abutted to the current collecting plate, the first tabs 20 at the inner ring are arranged between the first tabs 20 at the outer ring and the current collecting plate, and the first tabs 20 at the outer ring and the current collecting plate are prevented from being torn due to suspended parts; on the other hand, the width of the first tab 20 positioned on the outer ring is made to be as close as possible to the width of the first tab 20 positioned on the inner ring, so that the first tab 20 positioned on the outer ring and the current collecting plate have a sufficient welding area, and the welding strength and the current carrying capacity are ensured.

Of course, the ends of the first tabs 20 departing from the second tab 30 may also be non-flush, for example, at least two adjacent circles of the first tabs 20 may be flush with the end of the second tab 30 departing from the first tab 20, or three or more adjacent circles of the first tabs 20 may be flush with the end of the second tab 30 departing from the first tab 20, and it is also possible to make one end of a part of the first tabs 20 departing from the second tab 30 flush with the end of the other part of the first tabs 20 between the first tabs 20 departing from the end of the second tab 30 and the end of the second tab 30 not flush, which is not limited in this application. All the first tabs 20 of at least two adjacent rings are parallel and level with one end deviating from the second tab 30, the width of the first tab 20 positioned on the outer ring can be made to be as close as possible to the width of the first tab 20 positioned on the inner ring, and therefore the effect of ensuring that the first tab 20 positioned on the outer ring and the current collecting piece have enough welding area and ensuring welding strength and current carrying capacity is achieved.

In one embodiment of the present application, as shown in fig. 3, one end of the plurality of first tabs 20 adjacent to the second tab 30 is stepped. One end of the first tabs 20 close to the second tabs 30 is stepped, that is, the width of the first tabs 20 can be gradually decreased in the winding direction of the first pole piece, so that the orthographic projection of the first tabs 20 positioned on the outer ring on the first tabs 20 positioned on the inner ring is positioned in the first tabs 20 in two adjacent circles of the two first tabs 20 after the electric core is formed by winding.

As shown in fig. 3, among the plurality of first tabs 20, the first tab 20 may be divided into three width portions, wherein the plurality of first tabs near the inner side of the winding core have a first width having the same width, the plurality of first tabs near the outer side of the winding core have a third width having the same width, and the plurality of first tabs located in the middle portion have a second width having the same width. Of course, in the plurality of first tabs 20, the first tabs may be divided into two, four or more width portions, which is not limited in the present application.

In the plurality of first tabs 20, the distance between the side edges of two adjacent first tabs 20 far away from the winding starting edge of the first pole piece is the same, the width of the gap between the adjacent first tabs 20 in the winding direction is different, and the width of the gap increases progressively in the winding direction. The distance between the side of coiling the initiating side is the same through making two first utmost point ears 20 of adjacent two rings keep away from first pole piece, and a plurality of first utmost point ears 20 are kept away from between the side on first pole piece coiling initiating side and are the same promptly, be convenient for form first utmost point ear 20 on first pole piece body, improved the machining efficiency of this coiling formula electric core, improved first utmost point ear 20's position accuracy, and then guaranteed that the orthographic projection of first utmost point ear 20 that lies in the outer lane in a plurality of first utmost point ears 20 on the first utmost point ear 20 that lies in the inner circle is located first utmost point ear 20. Of course, in the plurality of first tabs 20, the distances between the side edges of the first tabs 20 of two adjacent circles, which are far away from the winding start edge of the first pole piece, may also be partially the same, and partially different; or, all the tabs are different, as long as it can be ensured that the orthographic projection of the first tab 20 positioned on the outer ring among the plurality of first tabs 20 on the first tab 20 positioned on the inner ring is positioned in the first tab 20, which is not limited in this application.

The plurality of first tabs 20 may be formed into an integrated first tab 20 by die cutting on the first pole piece body, or the first tab 20 may be connected to the first pole piece body by welding, bonding, or the like. Wherein, the thickness of a plurality of first utmost point ears 20 can be the same, is convenient for a plurality of first utmost point ears 20's preparation, has improved the machining efficiency of first pole piece. Of course, the thicknesses of the plurality of first tabs 20 may also be different, and the application is not limited thereto.

The heights of the plurality of first tabs 20 in the direction perpendicular to the winding direction (the axial direction of the winding type battery cell) can be the same, so that the plurality of first tabs 20 can be conveniently manufactured, and the processing efficiency of the first pole piece is improved; when the current collector is welded subsequently, on one hand, the first tab 20 positioned at the inner ring is ensured to be arranged between the first tab 20 positioned at the outer ring and the current collector after the first tab 20 positioned at the innermost ring is abutted to the current collector, so that suspended parts cannot appear between the first tab 20 positioned at the outer ring and the current collector; on the other hand, the height of the first tab 20 positioned on the outer ring is made to be as close as possible to the height of the first tab 20 positioned on the inner ring, so that the first tab 20 positioned on the outer ring has a sufficient welding area relative to the first tab 20 positioned on the inner ring and the current collecting plate, and the welding strength and the current carrying capacity are ensured.

As shown in fig. 3, the plurality of first tabs 20 are trapezoidal, and the trapezoidal first tabs 20 are adopted, so that the width of the connection position between the first tab 20 and the first pole piece body is large, and the connection strength between the first tab 20 and the first pole piece body is improved. Of course, the plurality of first tabs 20 may also be in the shape of a circle, a triangle, a rectangle, or an irregularity, which is not limited in this application, and all shapes that satisfy that the orthographic projection of the first tab 20 located at the outer ring on the first tab 20 located at the inner ring is located in the first tab 20 belong to the protection scope of this application.

For example, in the winding direction of the first pole piece, the root width dimension of the first layer first pole lug to the twenty-second layer first pole lug is 40 ± 0.5mm, the top width dimension is 36 ± 0.5mm, and the height dimension is 27.5 ± 0.1; the root width dimension of the twenty-second layer first tab to the third twelfth layer first tab is 38 +/-0.5 mm, and the top width dimension is 34 +/-0.5 mm; the height dimension is for example 27.5 ± 0.1; the root width dimension of the thirty-third layer first tab to the tail layer first tab is 36 +/-0.5 mm, and the top width dimension is 32 +/-0.5 mm; the height dimension is, for example, 27.5 ± 0.1. The above dimensions are merely exemplary, and the present application is not limited thereto, and any variation in the specific dimensions is within the scope of the present application.

In one embodiment of the present application, in two adjacent circles of the second pole ears 30, an orthographic projection of the second pole ear 30 located at the outer circle on the second pole ear 30 located at the inner circle is located in the second pole ear 30, that is, an orthographic projection of the second pole ear 30 located at the outer circle on a plane perpendicular to the second pole ear 30 located at the inner circle is located in the second pole ear 30 located at the inner circle.

When the second pole lug 30 is welded with the current collector later, due to the fact that the orthographic projection of the second pole lug 30 positioned on the inner ring is positioned in the second pole lug 30 in two adjacent circles, namely the width of the second pole lug 30 positioned on the outer ring in the winding direction is smaller than or equal to the width of the second pole lug 30 positioned on the inner ring; after the second pole lug 30 at the innermost ring is abutted to the current collecting piece, the second pole lug 30 at the inner ring is arranged between the second pole lug 30 at the outer ring and the current collecting piece, so that the second pole lug 30 at the outer ring and the current collecting piece cannot have suspended parts; consequently, when a plurality of second utmost point ears 30 and current collector weld, for example when carrying out ultrasonic bonding, the dislocation too big corner to rolling up core main part 10 can not appear in second utmost point ear 30, can not appear tearing phenomenon because of having the suspended portion to avoid electric core to scrap, improved the product yield.

In an embodiment of the present application, as shown in fig. 1, the end surface of the first tab 20 and the second tab 30 provided on the battery cell is in a shape of a kidney-shaped circle, and on the end surface of the winding battery cell, the plurality of first tabs 20 and the plurality of second tabs 30 are close to the same side of the end surface, that is, the plurality of first tabs 20 and the plurality of second tabs 30 are located on the same side of the winding axis of the winding battery cell, so that the plurality of first tabs 20 and the plurality of second tabs 30 are convenient to connect with the current collecting plate.

Wherein, as shown in fig. 4, one end of the plurality of second pole ears 30 facing away from the first pole ear 20 is flush. By making one end of the second pole lug 30, which is far away from the first pole lug 20, flush, when the second pole lug 30 is welded with the current collecting piece subsequently, on one hand, after the second pole lug 30 at the innermost ring is abutted to the current collecting piece, the second pole lug 30 at the inner ring is ensured to be arranged between the second pole lug 30 at the outer ring and the current collecting piece, so that the second pole lug 30 at the outer ring and the current collecting piece cannot be torn due to suspended parts; on the other hand, the width of the second pole lug 30 positioned on the outer ring is made to be as close as possible to the width of the second pole lug 30 positioned on the inner ring, so that the second pole lug 30 positioned on the outer ring and the current collecting plate are ensured to have enough welding area, and the welding strength and the current carrying capacity are ensured.

Of course, the ends of the second tabs 30 that depart from the first tab 20 may also be non-flush, for example, at least two adjacent circles of the second tabs 30 may deviate from the first tab 20, or three or more adjacent circles of the second tabs 30 may deviate from the first tab 20, or part of the second tabs 30 may deviate from the first tab 20 at one end that is flush with another part of the second tabs 30 that deviates from the first tab 20 at one end that deviates from the first tab 20 between the second tabs 30 that deviate from the first tab 20 at one end that is flush, which is not limited in this application. All the second pole ears 30 of at least two adjacent circles are parallel and level to one end deviating from the first pole ear 20, the width of the second pole ear 30 positioned on the outer circle can be made to be as close as possible to the width of the second pole ear 30 positioned on the inner circle, so that the effect of ensuring that the second pole ear 30 positioned on the outer circle and the current collecting piece have enough welding area and ensuring welding strength and current carrying capacity is achieved.

In one embodiment of the present application, the plurality of second pole ears 30 is stepped at an end thereof adjacent to the second pole ears 30. One end of the second pole lug 30 close to the first pole lug 20 is stepped, that is, in the winding direction of the second pole piece, the width of the second pole lug 30 can be gradually decreased, so as to ensure that, in two adjacent second pole lugs 30 which are wound to form a battery core, the orthographic projection of the second pole lug 30 positioned at the outer ring on the second pole lug 30 positioned at the inner ring is positioned in the second pole lug 30.

Among the plurality of second tabs 30, the plurality of second tabs 30 that can divide the second tab 30 into three width portions, the plurality of second tabs 30 that are close to the inner side of the winding core have a first width with the same width, the plurality of second tabs 30 that are close to the outer side of the winding core have a third width with the same width, and the plurality of second tabs 30 that are located in the middle portion have a second width with the same width. Of course, the second ear 30 may be divided into two, four or more width portions among the plurality of second ears 30, which is not limited in the present application.

Among the plurality of second pole pieces 30, the width of the gap between the adjacent second pole pieces 30 in the winding direction is the same, so that one end of the plurality of second pole pieces 30 close to the second pole pieces 30 is stepped. The width of the gap between the adjacent second pole ears 30 in the winding direction is the same, so that the second pole ears 30 can be conveniently formed on the second pole piece body, the processing efficiency of the winding type battery cell is improved, the position accuracy of the second pole ears 30 is improved, and the orthographic projection of the second pole ears 30 positioned on the outer ring among the plurality of second pole ears 30 on the second pole ears 30 positioned on the inner ring is ensured to be positioned in the second pole ears 30. Of course, in the plurality of second pole pieces 30, the widths of the gaps between the adjacent second pole pieces 30 in the winding direction may be partially the same and partially different; or, the positions of the second pole ears 30 located at the outer circle among the plurality of second pole ears 30 are different from each other as long as the orthographic projections of the second pole ears 30 located at the inner circle on the second pole ears 30 are located in the second pole ears 30, which is not limited in this application.

The plurality of second electrode tabs 30 may be formed by die-cutting the second electrode tab 30 on the second electrode body, or the second electrode tabs 30 may be connected to the second electrode body by welding, bonding, or the like. The thickness of the second pole ears 30 can be the same, so that the second pole ears 30 can be conveniently manufactured, and the processing efficiency of the second pole piece is improved. Of course, the thickness of the second pole ear 30 can be different, and the application is not limited thereto.

The heights of the second pole ears 30 in the direction perpendicular to the winding direction can be the same, so that the second pole ears 30 can be conveniently manufactured, and the processing efficiency of the second pole piece is improved; when the second pole lug 30 is welded with the current collecting piece, on one hand, the second pole lug 30 positioned in the inner ring is ensured to be arranged between the second pole lug 30 positioned in the outer ring and the current collecting piece after the second pole lug 30 positioned in the innermost ring is abutted to the current collecting piece, so that the second pole lug 30 positioned in the outer ring and the current collecting piece cannot have suspended parts; on the other hand, the height of the second pole ear 30 positioned on the outer ring is made to be as close as possible to the height of the second pole ear 30 positioned on the inner ring, so that the second pole ear 30 positioned on the outer ring is ensured to have a sufficient welding area relative to the second pole ear 30 positioned on the inner ring and the current collecting plate, and the welding strength and the current carrying capacity are ensured.

The second pole ears 30 are trapezoidal, the width of the connecting position of the second pole ears 30 and the second pole piece body is larger, and the connecting strength of the second pole ears 30 and the second pole piece body is improved. Of course, the second pole ears 30 may also be in the shape of a circle, a triangle, a rectangle, or an irregularity, which is not limited in this application, and all shapes that satisfy that the orthographic projection of the second pole ear 30 located at the outer ring on the second pole ear 30 located at the inner ring is located in the second pole ear 30 belong to the protection scope of this application.

The shapes and sizes of the first tabs 20 and the second tabs 30 in the same winding layer number may be the same or different, and the present application is not limited thereto. The subsequent connection with the current collector is facilitated by making the shape and size of the first tabs 20 and the second tabs 30 the same in the same number of winding layers.

For example, in the winding direction of the second pole piece, the root width dimension of the first layer second pole lug to the twenty-second layer second pole lug is 40 ± 0.5mm, the top width dimension is 36 ± 0.5mm, and the height dimension is 27.5 ± 0.1; the root width dimension of the twenty-second layer of the second pole ear to the thirty-second layer of the second pole ear is 38 +/-0.5 mm, and the top width dimension is 34 +/-0.5 mm; the height dimension is for example 27.5 ± 0.1; the width dimension of the root part of the thirty-third layer second pole lug to the tail layer second pole lug is 36 +/-0.5 mm, and the width dimension of the top part is 32 +/-0.5 mm; the height dimension is, for example, 27.5 ± 0.1. The above dimensions are merely exemplary, and the present application is not limited thereto, and any variation in the specific dimensions is within the scope of the present application.

The embodiment of the present application further provides a battery, which may be a lithium battery including the above-mentioned winding type battery cell, where the first tab 20 and the second tab 30 of the winding type battery cell are respectively used as positive and negative tabs of the battery cell, and the first tab 20 and the second tab 30 are respectively connected to the current collecting plate, and are electrically connected to the outside of the battery through the current collecting plate. For details and technical effects of the battery provided in the present application, please refer to the detailed discussion of the above embodiments of the winding type battery cell, which is not described herein again.

In the examples of this application, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the examples of the application can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present application, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred devices or units must have a specific direction, be configured and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present application.

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

The above description is only a preferred embodiment of the claimed embodiments and is not intended to limit the claimed embodiments, and various modifications and changes may be made to the claimed embodiments by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the applied embodiment shall be included in the protection scope of the applied embodiment.

Claims

1. The utility model provides a coiling type electricity core which characterized in that includes: the diaphragm comprises a first pole piece, a first diaphragm, a second pole piece and a second diaphragm, wherein the first pole piece, the first diaphragm, the second pole piece and the second diaphragm are alternately overlapped and wound; wherein the content of the first and second substances,

the first pole piece comprises a first pole piece body and a plurality of first pole lugs, each circle of the first pole piece body is provided with the first pole lug, and the orthographic projection of the first pole lug positioned on the outer circle on the first pole lug positioned on the inner circle is positioned in the first pole lug;

2. The wound battery cell according to claim 1, wherein, in the second tabs of two adjacent circles, an orthographic projection of the second tab located at the outer circle on the second tab located at the inner circle is located in the second tab.

3. The wound cell of claim 1, wherein one end of the first tabs facing away from the second tabs is flush.

4. The wound cell of claim 3, wherein an end of the plurality of first tabs proximate to the second tab is stepped.

5. The wound cell of claim 2, wherein the second plurality of tabs are flush with an end of the first tab facing away from the second tab.

6. The wound cell of claim 5, wherein an end of the second plurality of tabs proximate to the first tab is stepped.

7. The wound battery cell of claim 2, wherein the first tabs are of the same height in the axial direction of the wound battery cell, and the second tabs are of the same height in the axial direction of the wound battery cell.

8. The wound battery cell according to claim 2, wherein the plurality of first tabs and the plurality of second tabs are located on a same side of the end face of the wound battery cell.

9. The wound cell of claim 2, wherein the first and second pluralities of tabs are trapezoidal in shape.

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