Winding battery cell and battery with same

Abstract

The winding battery cell comprises a first pole piece, an isolating membrane and a second pole piece which are sequentially stacked and wound along a first direction, and each of the first pole piece, the isolating membrane and the second pole piece comprises a plurality of straight sections and a plurality of arc-shaped sections which are sequentially connected; the first pole piece is provided with a first coating section coated with a first active material and a first non-coating section not coated with the first active material, and the joint of the first coating section and the first non-coating section is located at the arc-shaped section of the first pole piece; the second pole piece is provided with a second coating section coated with a second active material and a second uncoated section not coated with the second active material, and the joint of the second coating section and the second uncoated section is located at the arc-shaped section of the second pole piece. The winding battery cell provided by the embodiment of the utility model has the characteristics of long service life and high safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the winding battery technical field, especially to a winding battery cell and a battery with the same. BACKGROUND

[0002] The pole piece of the winding battery cell comprises flat segments and arc segments connected in sequence, and has a region coated with active material and a region not coated with active material material.

[0003] In the related art, the connection position of the region coated with active material and the region not coated with active material material is arranged on the flat segment of the pole piece close to the connection position of the flat segment and the arc segment, so that the connection position of the region coated with active material and the region not coated with active material material forms a step on the pole piece, so that the curvature and stress of the pole piece at the starting position of the arc segment are large, and the pole piece at this position is easily damaged and broken during the charge and discharge cycle, greatly reducing the service life and safety of the winding battery cell. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0005] To this end, an embodiment of the present application provides a winding battery cell.

[0006] The winding battery cell of the present application embodiment comprises a first pole piece, a separator film and a second pole piece which are stacked and wound in sequence along a first direction, wherein the first pole piece, the separator film and the second pole piece each comprise a plurality of flat segments and a plurality of arc segments connected in sequence.

[0007] The first pole piece is provided with a first coated segment coated with a first active material and a first uncoated segment not coated with the first active material, and the connection position of the first coated segment and the first uncoated segment is located on the arc segment of the first pole piece.

[0008] The second pole piece is provided with a second coated segment coated with a second active material and a second uncoated segment not coated with the second active material, and the connection position of the second coated segment and the second uncoated segment is located on the arc segment of the second pole piece.

[0009] The winding electric core has the characteristics of long service life and high safety.

[0010] Therefore, the winding electric core has the characteristics of long service life and high safety.

[0011] In some embodiments, the first pole piece has a first surface and a second surface in a thickness direction thereof;

[0012] The first surface is provided with the first coating section and the first non-coating section, the first non-coating section is located at the end of the first surface, and the connection between the first non-coating section and the first coating section connected thereto is located on the arc-shaped section of the first pole piece.

[0013] The second surface is provided with the first coating section and the first non-coating section, the first non-coating section is located at the end of the second surface, and the connection between the first non-coating section and the first coating section connected thereto is located on the arc-shaped section of the first pole piece.

[0014] In some embodiments, the included angle between the line connecting the end of the first coating section and the center of the arc-shaped section where the end of the first coating section is located and the line connecting the start end of the arc-shaped section where the end of the first coating section is located and the center of the arc-shaped section where the end of the first coating section is located is 15-165 degrees.

[0015] In some embodiments, the second pole piece has a third surface and a fourth surface in a thickness direction thereof;

[0016] The third surface is provided with the second coating section and the second non-coating section, the second non-coating section is located at the end of the third surface, and the connection between the second non-coating section and the second coating section connected thereto is located on the arc-shaped section of the second pole piece.

[0017] The fourth surface is provided with the second coating section and the second uncoated section, the second uncoated section is located at the end of the fourth surface, and the connection between the second uncoated section and the second coating section connected therewith is located at the arc section of the second pole piece.

[0018] In some embodiments, the angle between the line connecting the end of the second coating section and the center of the arc section where the end of the second coating section is located and the line connecting the beginning of the arc section where the end of the second coating section is located and the center of the arc section where the end of the second coating section is located is 15-165 degrees.

[0019] In some embodiments, the first uncoated section at the end of the first surface of the first pole piece is provided with insulating protective tape, and the first uncoated section at the end of the second surface of the first pole piece is provided with insulating protective tape.

[0020] In some embodiments, the second uncoated section at the end of the third surface of the second pole piece is provided with insulating protective tape, and the second uncoated section at the end of the fourth surface of the second pole piece is provided with insulating protective tape.

[0021] In some embodiments, the winding electric core of the embodiment of the utility model further comprises a first tab, the first tab is connected with the beginning of the first pole piece, and the surface of the part where the first tab is connected with the first pole piece is provided with insulating protective tape.

[0022] In some embodiments, the winding electric core of the embodiment of the utility model further comprises a second tab, the second tab is connected with the beginning of the second pole piece, and the surface of the part where the second tab is connected with the second pole piece is provided with insulating protective tape.

[0023] The embodiment of the utility model further provides a battery comprising the winding electric core as described in the above embodiments.

[0024] The battery of the embodiment of the utility model has the characteristics of long service life and high safety.

[0025] Therefore, the battery of the embodiment of the utility model has the characteristics of long service life and high safety. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0027] Figure 1 It is the structural schematic diagram of the winding electric core of the embodiment of the utility model.

[0028] In the drawing:

[0029] 100, flat section; 200, arc section;

[0030] 1, first pole piece; 101, first coating section; 102, first non-coating section;

[0031] 2, isolation film;

[0032] 3, second pole piece; 301, second coating section; 302, second non-coating section;

[0033] 4, insulating protective adhesive paper;

[0034] 5, first pole lug;

[0035] 6, second pole lug. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects solved by the present application clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0037] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0038] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be internal glue injection of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] The following will be described in detail with reference to the drawings Figure 1 The winding battery cell of the utility model embodiment is described.

[0040] The winding battery cell of the utility model embodiment comprises a first pole piece 1, a separator film 2 and a second pole piece 3 which are sequentially stacked and wound along a first direction, and the first pole piece 1, the separator film 2 and the second pole piece 3 all comprise a plurality of flat sections 100 and a plurality of arc sections 200 which are sequentially connected.

[0041] As shown in the figure, the first direction is a direction from the outside of the winding battery cell to the inside of the winding battery cell, the pole, the first pole piece 1 of the winding battery cell is the pole piece located at the outermost side.

[0042] The first pole piece 1 is provided with a first coating section 101 coated with a first active material and a first uncoated section 102 not coated with the first active material, and the connection between the first coating section 101 and the first uncoated section 102 is located at the arc section 200 of the first pole piece 1.

[0043] The second pole piece 3 is provided with a second coating section 301 coated with a second active material and a second uncoated section 302 not coated with the second active material, and the connection between the second coating section 301 and the second uncoated section 302 is located at the arc-shaped section 200 of the second pole piece 3.

[0044] It can be understood that, by arranging the connection between the first coating section 101 and the first uncoated section 102 on the first pole piece 1 at the arc-shaped section 200 of the first pole piece 1 and arranging the connection between the second coating section 301 and the second uncoated section on the second pole piece 3 at the arc-shaped section 200 of the second pole piece 3, the connection between the first coating section 101 and the first uncoated section 102 on the first pole piece 1 can be prevented from forming a step at the start of the arc-shaped section 200 of the first pole piece 1, so that the curvature and stress at the start of the arc-shaped section 200 of the first pole piece 1 can be reduced, and the connection between the second coating section 301 and the second uncoated section on the second pole piece 3 can be prevented from forming a step at the start of the arc-shaped section 200 of the second pole piece 3, so that the curvature and stress at the start of the arc-shaped section 200 of the second pole piece 3 can be reduced, and the problem of pole piece fracture of the wound battery during the charging and discharging cycle can be avoided, so that the service life of the wound battery is greatly prolonged and the safety of the wound battery is greatly improved.

[0045] Therefore, the wound battery has the characteristics of long service life and high safety.

[0046] In some embodiments, the first pole piece 1 has a thickness direction opposite the first surface and the second surface;

[0047] The first surface is provided with the first coating section 101 and the first uncoated section 102, the first uncoated section 102 is located at the end of the first surface, and the connection between the first uncoated section 102 and the first coating section 101 is located at the arc-shaped section 200 of the first pole piece 1.

[0048] The second surface is provided with the first coating section 101 and the first uncoated section 102, the first uncoated section 102 is located at the end of the second surface, and the connection between the first uncoated section 102 and the first coating section 101 is located at the arc-shaped section 200 of the first pole piece 1.

[0049] The wound battery of the embodiment of the utility model can avoid the connection between the first coating section 101 and the first uncoated section 102 on the first surface and the second surface of the first pole piece 1 from forming a step at the start of the arc-shaped section 200 of the first pole piece 1, so that the curvature and stress at the start of the arc-shaped section 200 of the first pole piece 1 can be reduced, and the problem of pole piece fracture of the wound battery during the charging and discharging cycle can be avoided, so that the service life and safety of the wound battery are greatly improved.

[0050] Further, the included angle between the line connecting the end of the first coating section 101 and the center of the arc section 200 where the end of the first coating section 101 is located and the line connecting the start of the arc section 200 where the end of the first coating section 101 is located and the center of the arc section 200 where the end of the first coating section 101 is located is 15-165 degrees.

[0051] The winding electric core of the embodiment of the utility model can further avoid the formation of a step at the start of the arc section 200 of the first pole piece 1 by the end of the first coating section 101, thereby reducing the curvature and stress at the start of the arc section 200 of the first pole piece 1, and further avoiding the problem of pole piece fracture of the winding electric core in the process of charge-discharge cycle, greatly improving the service life and safety of the winding electric core.

[0052] In some embodiments, the second pole piece 3 has a third surface and a fourth surface in the thickness direction thereof;

[0053] The third surface is provided with a second coating section 301 and a second uncoated section 302, the second uncoated section 302 is located at the end of the third surface, and the connection between the second uncoated section 302 and the second coating section 301 connected thereto is located at the arc section 200 of the second pole piece 3.

[0054] The fourth surface is provided with a second coating section 301 and a second uncoated section 302, the second uncoated section 302 is located at the end of the fourth surface, and the connection between the second uncoated section 302 and the second coating section 301 connected thereto is located at the arc section 200 of the second pole piece 3.

[0055] The winding electric core of the embodiment of the utility model can further avoid the formation of a step at the start of the arc section 200 of the second pole piece 3 by the connection between the second coating section 301 and the second uncoated section on the third surface and the fourth surface, thereby reducing the curvature and stress at the start of the arc section 200 of the second pole piece 3, and further avoiding the problem of pole piece fracture of the winding electric core in the process of charge-discharge cycle, greatly improving the service life and safety of the winding electric core.

[0056] Further, the included angle between the line connecting the end of the second coating section 301 and the center of the arc section 200 where the end of the second coating section 301 is located and the line connecting the start of the arc section 200 where the end of the second coating section 301 is located and the center of the arc section 200 where the end of the second coating section 301 is located is 15-165 degrees.

[0057] The winding electric core in the embodiment of the utility model can further avoid the formation of a step at the start of the arc section 200 of the second pole piece 3 by the end of the second coating section 301, so that the curvature and stress at the start of the arc section 200 of the second pole piece 3 can be reduced, and the problem of pole piece fracture of the winding electric core in the process of charge-discharge cycle can be avoided, and the service life and safety of the winding electric core are greatly improved.

[0058] In some embodiments, the first uncoated section 102 at the end of the first surface of the first pole piece 1 is provided with insulating protective tape 4, and the first uncoated section 102 at the end of the second surface of the first pole piece 1 is provided with insulating protective tape 4.

[0059] It can be understood that the first uncoated section 102 at the end of the first surface and the second surface of the first pole piece 1 is not coated with the first active material, in other words, the first uncoated section 102 of the first pole piece 1 which is not coated with the first active material is a bare metal pole piece, and the insulating protective tape 4 is arranged on the first uncoated section 102 of the first pole piece 1, which can avoid the burrs on the surface of the first uncoated section 102 from piercing the isolation film 2 and causing short circuit of the winding electric core.

[0060] The winding electric core in the embodiment of the utility model can avoid the burrs on the surface of the first uncoated section 102 of the first pole piece 1 from piercing the isolation film 2 and causing short circuit of the winding electric core by arranging the insulating protective tape 4 on the first uncoated section 102 of the first pole piece 1, and the safety of the winding electric core in the embodiment of the utility model is greatly improved.

[0061] In some embodiments, the second uncoated section 302 at the end of the third surface of the second pole piece 3 is provided with insulating protective tape 4, and the second uncoated section 302 at the end of the fourth surface of the second pole piece 3 is provided with insulating protective tape 4.

[0062] It can be understood that the second uncoated section 302 located at the end of the third surface and the fourth surface of the second pole piece is not coated with the second active material, in other words, the second uncoated section 302 of the second pole piece 3 on which the second active material is not coated is a bare metal pole piece, by arranging the insulating protective adhesive tape 4 on the second uncoated section 302 on the second pole piece 3, the problem that the burrs on the surface of the second uncoated section 302 pierce the isolation film 2 to cause short circuit of the wound battery cell can be avoided.

[0063] The wound battery cell in the embodiment of the utility model can avoid the burrs on the surface of the second uncoated section 302 on the second pole piece 3 from piercing the isolation film 2 to cause short circuit of the wound battery cell by arranging the insulating protective adhesive tape 4 on the second uncoated section 302 on the second pole piece 3, and the safety of the wound battery cell in the embodiment of the utility model is greatly improved.

[0064] In some embodiments, the wound battery cell in the embodiment of the utility model further comprises a first tab 5, the first tab 5 is connected to the beginning end of the first pole piece 1, and the surface of the connected part of the first tab 5 and the first pole piece 1 is provided with the insulating protective adhesive tape 4.

[0065] The wound battery cell in the embodiment of the utility model can avoid the burrs on the surface of the first tab 5 from piercing the isolation film 2 to cause short circuit of the wound battery cell by arranging the insulating protective adhesive tape 4 on the surface of the connected part of the first tab 5 and the first pole piece 1, and the safety of the wound battery cell in the embodiment of the utility model is greatly improved.

[0066] In some embodiments, the wound battery cell in the embodiment of the utility model further comprises a second tab 6, the second tab 6 is connected to the beginning end of the second pole piece 3, and the surface of the connected part of the second tab 6 and the second pole piece 3 is provided with the insulating protective adhesive tape 4.

[0067] The wound battery cell in the embodiment of the utility model can avoid the burrs on the surface of the second tab 6 from piercing the isolation film 2 to cause short circuit of the wound battery cell by arranging the insulating protective adhesive tape 4 on the surface of the connected part of the second tab 6 and the second pole piece 3, and the safety of the wound battery cell in the embodiment of the utility model is greatly improved.

[0068] In some embodiments, the end of the third surface and the fourth surface of the second pole piece 3 in the embodiment of the utility model can not be provided with the second uncoated section 302, that is, the third surface and the fourth surface of the second pole piece 3 end with the second coated section 301, and the end of the first pole piece 1 is located in front of the end of the second pole piece 3 in the winding direction of the wound battery cell, that is, the end part of the first pole piece 1 can cover the end of the second pole piece 3, and the end of the first pole piece 1 is fixed by using the insulating protective adhesive tape 4, and accordingly the end of the third surface and the fourth surface of the second pole piece 3 does not need to be provided with the insulating protective adhesive tape 4 as in the above embodiment, and the problem that the burrs on the second pole piece pierce the isolation film 2 to cause short circuit of the wound battery cell does not need to occur.

[0069] The utility model embodiment further provides a battery, including the winding electric core as the embodiment described above.

[0070] The battery of the utility model embodiment adopts the winding electric core of the above embodiment, sets the connecting place of the first coating section 101 and the first uncoated section 102 on the first pole piece 1 of the winding electric core on the arc section 200 of the first pole piece 1 of the winding electric core, and sets the connecting place of the second coating section 301 and the second uncoated section on the second pole piece 3 of the winding electric core on the arc section 200 of the second pole piece 3 of the winding electric core, which can avoid the connecting place of the first coating section 101 and the first uncoated section 102 on the first pole piece 1 of the winding electric core forming a step at the start of the arc section 200 of the first pole piece 1 of the winding electric core, thereby reducing the curvature and stress at the start of the arc section 200 of the first pole piece 1 of the winding electric core, and also avoiding the connecting place of the second coating section 301 and the second uncoated section on the second pole piece 3 of the winding electric core forming a step at the start of the arc section 200 of the second pole piece 3, thereby reducing the curvature and stress at the start of the arc section 200 of the second pole piece 3 of the winding electric core, and further avoiding the problem of pole piece fracture of the winding electric core in the process of charge and discharge cycle, thereby greatly prolonging the service life of the battery with the winding electric core and greatly improving the safety of the battery with the winding electric core.

[0071] Therefore, the battery of the utility model embodiment has the characteristics of long service life and high safety.

[0072] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A wound battery cell, characterized in that, It includes a first electrode (1), a separator (2) and a second electrode (3) that are stacked and wound in sequence along a first direction. The first electrode (1), the separator (2) and the second electrode (3) each include a plurality of straight segments (100) and a plurality of arc segments (200) connected in sequence. The first electrode (1) is provided with a first coated section (101) coated with a first active material and a first uncoated section (102) not coated with the first active material. The connection between the first coated section (101) and the first uncoated section (102) is located in the arc-shaped section (200) of the first electrode (1). The second electrode (3) is provided with a second coated section (301) coated with the second active material and a second uncoated section (302) not coated with the second active material. The connection between the second coated section (301) and the second uncoated section (302) is located in the arc-shaped section (200) of the second electrode (3).

2. The wound battery cell according to claim 1, characterized in that, The first electrode (1) has a first surface and a second surface opposite each other in its thickness direction; The first surface is provided with the first coated section (101) and the first uncoated section (102). The first uncoated section (102) is located at the end of the first surface, and the connection between the first uncoated section (102) and the first coated section (101) connected to it is located at the arc-shaped section (200) of the first electrode (1). The second surface is provided with the first coated section (101) and the first uncoated section (102). The first uncoated section (102) is located at the end of the second surface, and the connection between the first uncoated section (102) and the first coated section (101) connected to it is located at the arc-shaped section (200) of the first electrode (1).

3. The wound battery cell according to claim 2, characterized in that, The angle between the line connecting the end of the first coating segment (101) and the center of the arc segment (200) where the end of the first coating segment (101) is located and the line connecting the beginning of the arc segment (200) where the end of the first coating segment (101) is located and the center of the arc segment (200) where the end of the first coating segment (101) is located is 15°-165°.

4. The wound battery cell according to claim 1, characterized in that, The second electrode (3) has a third surface and a fourth surface in its thickness direction; The third surface is provided with a second coated section (301) and a second uncoated section (302). The second uncoated section (302) is located at the end of the third surface, and the connection between the second uncoated section (302) and the second coated section (301) connected to it is located at the arc-shaped section (200) of the second electrode (3). The fourth surface is provided with a second coated section (301) and a second uncoated section (302). The second uncoated section (302) is located at the end of the fourth surface, and the connection between the second uncoated section (302) and the second coated section (301) connected to it is located at the arc-shaped section (200) of the second electrode (3).

5. The wound battery cell according to claim 4, characterized in that, The angle between the line connecting the end of the second coating segment (301) and the center of the arc segment (200) where the end of the second coating segment (301) is located and the line connecting the beginning of the arc segment (200) where the end of the second coating segment (301) is located and the center of the arc segment (200) where the end of the second coating segment (301) is located is 15°-165°.

6. The wound battery cell according to claim 2, characterized in that, Insulating protective tape (4) is provided on the first uncoated section (102) at the end of the first surface of the first electrode (1), and insulating protective tape (4) is provided on the first uncoated section (102) at the end of the second surface of the first electrode (1).

7. The wound battery cell according to claim 4, characterized in that, Insulating protective tape (4) is provided on the second uncoated section (302) at the end of the third surface of the second electrode (3), and insulating protective tape (4) is provided on the second uncoated section (302) at the end of the fourth surface of the second electrode (3).

8. The wound battery cell according to claim 1, characterized in that, It also includes a first electrode tab (5), which is connected to the beginning of the first electrode plate (1), and the surface of the part of the first electrode tab (5) connected to the first electrode plate (1) is provided with insulating protective adhesive paper (4).

9. The wound battery cell according to claim 1, characterized in that, It also includes a second electrode tab (6), which is connected to the beginning of the second electrode plate (3), and the surface of the part of the second electrode tab (6) connected to the second electrode plate (3) is provided with insulating protective adhesive paper (4).

10. A battery, characterized in that, Includes wound cells as described in any one of claims 1-9.

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