Lithium battery tab convenient to connect

Abstract

The utility model relates to the technical field of battery tabs and discloses a lithium battery tab convenient to connect, which comprises a first pole piece and a second pole piece which are arranged on two sides of a diaphragm, the first pole piece comprises a first connecting section and a second connecting section, a first end of the first connecting section is coated with a first adhesive layer, and a second end of the second connecting section is coated with a second adhesive layer. The second end of the first connecting section and the first end of the second connecting section are at least partially overlapped and welded to form a connecting part, and the connecting part is coated with a second bonding layer; the second end of the second connecting section is coated with a third bonding layer; one side of the second end of the second connecting section extends outwards to form a first extending part, and one side, far away from the second connecting section, of the first extending part extends outwards to form a second extending part; one end of the second extension part is provided with an outer convex part along the direction parallel to the second connecting section, the other end of the second extension part is provided with an inner concave position corresponding to the outer convex part, and the outer convex part is inserted at the lower side of the inner concave position of the next pole piece by winding the first pole piece. The scheme is simple in structure and convenient to connect with a cover plate connecting sheet.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pole ears, in particular to a lithium battery pole ear which is easy to connect. Background Art

[0002] Lithium battery is a storage battery with the characteristics of high energy density and long life, so it is widely used in electronic products such as mobile phones, laptops, electric vehicles, etc. Lithium battery is mainly composed of aluminum shell, cover plate and battery cell. The battery cell is composed of positive electrode, negative electrode, diaphragm and electrolyte. The positive electrode and negative electrode are isolated from each other to prevent short circuit. The tab is a metal conductor that leads the positive and negative electrodes from the battery cell and is connected to the connecting piece inside the cover plate. The positive electrode tab is mostly made of aluminum strip. The aluminum strip is thin and soft, easy to bend and deform, and even break, which is not conducive to the subsequent connection with the cover plate connecting piece, affecting the normal operation of the battery. Therefore, it is necessary to provide a lithium battery tab with simple structure, high strength and easy connection. Utility Model Content

[0003] In order to solve the deficiencies in the prior art, the utility model provides a novel lithium battery pole ear that is easy to connect, so as to solve the problem that the existing battery pole ear is not conducive to subsequent connection with the cover plate connecting piece.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A lithium battery pole piece that is easy to connect, used to facilitate the connection of the pole piece, comprising a first pole piece and a second pole piece arranged on both sides of a diaphragm, wherein the first pole piece comprises a first connecting section and a second connecting section, the first end of the first connecting section is coated with a first adhesive layer, the second end of the first connecting section at least partially overlaps and is welded with the first end of the second connecting section to form a connecting portion, the connecting portion is coated with a second adhesive layer; the second end of the second connecting section is coated with a third adhesive layer;

[0006] One side of the second end of the second connecting segment extends outward to form a first extension portion, and the first extension portion is located in the diaphragm area. The first extension portion extends outward away from the side of the second connecting segment to form a second extension portion, and the second extension portion at least partially protrudes from the diaphragm; one end of the second extension portion is provided with an outer protrusion along a direction parallel to the second connecting segment, and the other end of the second extension portion is provided with an inner concave position corresponding to the position of the outer protrusion, and the outer protrusion is inserted into the lower side of the inner concave position of the next pole piece by winding the first pole piece.

[0007] Furthermore, an outer protrusion is provided at one end of the second extension portion away from the first connection section and in a direction parallel to the second connection section, and the shape of the end surface of the outer protrusion is an arc.

[0008] Furthermore, the thickness of the outer protrusion is smaller than the thickness of the second extension portion.

[0009] Furthermore, the width of the first extending portion is smaller than the width of the second extending portion, and the length of the protruding portion is smaller than 1 / 3 of the length of the second extending portion.

[0010] Furthermore, the length of the second connecting segment is not greater than 1 / 3 of the length of the first connecting segment; the length of the second adhesive layer is not less than 2 mm; the second end of the first connecting segment at least partially protrudes from the second adhesive layer, and the protruding portion of the second end of the first connecting segment is not greater than 2 mm.

[0011] Furthermore, the first connecting section is an aluminum strip, the second connecting section is a nickel strip, and the thickness of the second connecting section is not greater than the thickness of the first connecting section.

[0012] Furthermore, one end of the second pole piece extends outward to form a third extension portion, and the third extension portion at least partially protrudes from the diaphragm, and the diameter of the end of the third extension portion away from the second pole piece is smaller than the diameter of the end close to the second pole piece.

[0013] Furthermore, both ends of the second pole piece are coated with a fourth adhesive layer, and the second pole piece is bonded to a side of the diaphragm away from the first pole piece through the fourth adhesive layer.

[0014] The beneficial effect compared with the prior art is that, by adopting the above scheme, the lithium battery pole piece of the utility model which is easy to connect is first overlapped and welded with the second end of the first connecting section and the first end of the second connecting section, and then the welding part is coated with an adhesive layer; then the first end of the first connecting section and the second end of the second connecting section are coated with an adhesive layer; the first pole piece composed of the first connecting section and the second connecting section is bonded to one side of the diaphragm through the adhesive layers at three positions; then the second pole piece is bonded to the other side of the diaphragm; then the first pole piece and the second pole piece are alternately arranged on both sides of the diaphragm, and when winding into a disk, the outer convex part of the second extension part of the inner layer first pole piece is inserted into the lower side of the inner concave part of the outer layer first pole piece, so that the pole piece led out of the first pole piece is surrounded and spliced ​​in a fish scale stacking manner, and the surrounding pole piece ring is convenient for better connection with the connecting piece of the battery cover plate, thereby improving the connection stability and having good market application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a lithium battery tab in one embodiment of the utility model;

[0016] Figure 2 For the utility model Figure 1 A schematic structural diagram of a first connecting section and a second connecting section of an embodiment;

[0017] Figure 3 For the utility model Figure 1 A schematic structural diagram of a second connecting section of an embodiment;

[0018] Figure 4 For the utility model Figure 1 A schematic structural diagram of a second pole piece of an embodiment;

[0019] In the figure, 1, diaphragm; 2, first pole piece; 21, first adhesive layer; 22, second adhesive layer; 23, third adhesive layer; 3, first connecting section; 31, connecting portion; 32, protruding portion; 4, second connecting section; 41, first extension portion; 42, second extension portion; 43, outer protrusion; 44, inner concave portion; 5, second pole piece; 51, fourth adhesive layer; 52, third extension portion. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention by those skilled in the art, the specific implementation methods of the present invention are described below in conjunction with the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "mounted", "fixed", "upper side", "lower side" and similar expressions used in this specification are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by technicians in the technical field of the utility model. The terms used in this specification are only for the purpose of describing specific embodiments and are not used to limit the utility model.

[0023] One embodiment of the present invention is as follows: Figure 1 , 2, 3, the lithium battery pole ear that is easy to connect is used to make the pole ear easy to connect, including a first pole piece 2 and a second pole piece 5 arranged on both sides of the diaphragm 1, the first pole piece 2 includes a first connecting section 3 and a second connecting section 4, the first end of the first connecting section 3 is coated with a first adhesive layer 21, the second end of the first connecting section 3 and the first end of the second connecting section 4 are at least partially overlapped and welded to form a connecting portion 31, and the connecting portion 31 is coated with a second adhesive layer 22; the second end of the second connecting section 4 is coated with a third adhesive layer 23; the second end of the second connecting section 4 The first extension portion 41 is located in the area of ​​the diaphragm 1, and the first extension portion 41 extends outward from the side of the second connecting segment 4 to form a second extension portion 42. The second extension portion 42 at least partially protrudes from the diaphragm 1, and one end of the second extension portion 42 is provided with an outer protrusion 43 along a direction parallel to the second connecting segment 4, and the other end of the second extension portion 42 is provided with an inner concave position 44 corresponding to the position of the outer protrusion 43, and the outer protrusion 43 is inserted under the inner concave position 44 of the next pole piece by winding the first pole piece 2.

[0024] The lithium battery pole piece of the scheme which is easy to connect is suitable for connecting with other materials. First, the second end of the first connecting section 3 and the first end of the second connecting section 4 are partially overlapped and welded, and then the welding part is coated with an adhesive layer; then the first end of the first connecting section 3 and the second end of the second connecting section 4 are coated with an adhesive layer; the first pole piece 2 composed of the first connecting section 3 and the second connecting section 4 is bonded to one side of the diaphragm 1 through the adhesive layers at three positions; then the second pole piece 5 is bonded to the other side of the diaphragm 1; then the first pole piece 2 and the second pole piece 5 are alternately arranged on both sides of the diaphragm 1, and when winding into a disk, the outer protrusion 43 of the second extension portion 42 of the inner first pole piece is inserted under the inner concave position 44 of the outer first pole piece, so that the pole piece led out of the first pole piece 2 is surrounded and spliced ​​in a fish scale stacking manner, and the surrounding pole piece ring is convenient for better connection with the connecting piece of the battery cover plate, thereby improving the connection stability.

[0025] In this embodiment, Figure 3 As shown, the second extension portion 42 is disposed at one end away from the first connection section 3 and in a direction parallel to the second connection section 4, and an outer protrusion 43 is provided, and the shape of the end surface of the outer protrusion 43 is an arc.

[0026] Specifically, the right end of the first connecting segment 3 is the first end, and the first adhesive layer 21 is coated on the right end of the first connecting segment 3; the left end of the first connecting segment 3 is the second end, which overlaps and is welded with the right end portion of the second connecting segment 4, and is coated with the second adhesive layer 22; the left end of the second connecting segment 4 is the second end, and the left end of the second connecting segment 4 is coated with the third adhesive layer 23, and the first electrode 2 composed of the first connecting segment 3 and the second connecting segment 4 is bonded to one side of the diaphragm 1 through the adhesive layers at three positions.

[0027] Specifically, a first extension portion 41 is provided on the upper side of the left end of the second connecting section 4, and the first extension portion 41 is located in the area of ​​the diaphragm 1, and a second extension portion 42 is provided on the first extension portion 41, and most of the second extension portion 42 is located on the outside of the diaphragm 1, and an outer convex portion 43 is provided at the left end of the second extension portion 42 extending toward the left, and an inner concave position 44 is provided at the right end of the second extension portion 42 concave toward the left, and the outer convex portion 43 is matched with the inner concave position 44 so that the outer convex portion 43 can be placed on the inner side of the inner concave position 44.

[0028] In this embodiment, Figure 3 As shown, the thickness of the outer protrusion 43 is smaller than the thickness of the second extension portion 42 .

[0029] Specifically, the outer protrusion 43 is gradually inclined downward from the first connecting section 3 to the second connecting section 4, that is, the thickness of the outer protrusion 43 gradually decreases from the end close to the second extension portion 42 to the left to form an inclined surface, so as to facilitate insertion into the lower side of the inner recess 44 of the next pole piece.

[0030] In this embodiment, Figure 3 As shown, the width of the first extension portion 41 is smaller than the width of the second extension portion 42 , and the length of the protruding portion 43 is smaller than 1 / 3 of the length of the second extension portion 42 .

[0031] Specifically, the width of the first extension portion 41 is 2 mm, the width of the second extension portion 42 is 4 mm, the length of the second extension portion 42 is 4.5 mm, and the length of the protruding portion 43 is less than 1.5 mm.

[0032] In this embodiment, Figure 1 As shown, the length of the second connecting segment 4 is not greater than 1 / 3 of the length of the first connecting segment 3; the length of the second adhesive layer 22 is not less than 2 mm; the second end of the first connecting segment 3 at least partially protrudes from the second adhesive layer 22, and the protruding portion 32 of the second end of the first connecting segment 3 is not greater than 2 mm.

[0033] In this embodiment, Figure 2As shown, the first connecting section 3 is an aluminum strip, the second connecting section 4 is a nickel strip, and the thickness of the second connecting section 4 is not greater than the thickness of the first connecting section 3 .

[0034] Specifically, the length of the aluminum strip is 24 mm, the length of the nickel strip is 12 mm, the length of the second adhesive layer 22 is 4.5 mm, the length of the protruding portion 32 at the left end of the first connecting section 3 is 1.5 mm, the thickness of the aluminum strip is 0.1 mm, and the thickness of the nickel strip is 0.09 mm.

[0035] In this embodiment, Figure 4 As shown, one end of the second pole piece 5 extends outward to form a third extension portion 52 , and the third extension portion 52 at least partially protrudes from the diaphragm 1 , and the diameter of the third extension portion 52 away from the second pole piece 5 is smaller than the diameter of the end close to the second pole piece 5 .

[0036] Specifically, the right end of the second pole piece 5 extends vertically downward to form a third extension portion 52. The third extension portion 52 is a convex structure. The bottom of the third extension portion 52 protrudes from the diaphragm 1. The diameter of the bottom end of the third extension portion 52 is smaller than the diameter near the top end of the third extension portion 52.

[0037] In this embodiment, Figure 4 As shown, both ends of the second pole piece 5 are coated with a fourth adhesive layer 51 , and the second pole piece 5 is bonded to a side of the diaphragm 1 away from the first pole piece 2 through the fourth adhesive layer 51 .

[0038] Specifically, the first adhesive layer 21 , the second adhesive layer 22 and the third adhesive layer 23 on the first pole piece 2 , and the fourth adhesive layer 51 at both ends of the second pole piece 5 are all made of white glue to bond the first pole piece 2 and the second pole piece 5 to both sides of the diaphragm 1 .

[0039] It should be noted that the above-mentioned technical features are further combined with each other to form various embodiments not listed above, which are all deemed to be within the scope of the present utility model specification; and, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should fall within the scope of protection of the claims attached to the present utility model.

Claims

1. A lithium battery tab that is easy to connect, used to facilitate the connection of the tab, characterized in that: The invention comprises a first pole piece (2) and a second pole piece (5) arranged on both sides of a diaphragm (1), the first pole piece (2) comprising a first connecting section (3) and a second connecting section (4), the first end of the first connecting section (3) being coated with a first adhesive layer (21), the second end of the first connecting section (3) and the first end of the second connecting section (4) being at least partially overlapped and welded to form a connecting portion (31), the connecting portion (31) being coated with a second adhesive layer (22); the second end of the second connecting section (4) being coated with a third adhesive layer (23); One side of the second end of the second connecting section (4) extends outward to form a first extension portion (41), the first extension portion (41) is located in the diaphragm (1) area, the first extension portion (41) extends outward away from the side of the second connecting section (4) to form a second extension portion (42), the second extension portion (42) at least partially protrudes from the diaphragm (1); one end of the second extension portion (42) is provided with an outer protrusion (43) along a direction parallel to the second connecting section (4), and the other end of the second extension portion (42) is provided with an inner concave position (44) corresponding to the position of the outer protrusion (43), and the outer protrusion (43) is inserted under the inner concave position (44) of the next pole piece by winding the first pole piece (2).

2. The lithium battery tab that is easy to connect according to claim 1, characterized in that: An outer convex portion (43) is provided at one end of the second extension portion (42) away from the first connection section (3) in a direction parallel to the second connection section (4), and the end surface of the outer convex portion (43) is in an arc shape.

3. The lithium battery tab that is easy to connect according to claim 2, characterized in that: The thickness of the outer protrusion (43) is smaller than the thickness of the second extension portion (42).

4. The lithium battery tab that is easy to connect according to claim 3, characterized in that: The width of the first extension portion (41) is smaller than the width of the second extension portion (42), and the length of the outer protrusion (43) is smaller than 1 / 3 of the length of the second extension portion (42).

5. The lithium battery tab that is easy to connect according to claim 1, characterized in that: The length of the second connecting section (4) is not greater than 1 / 3 of the length of the first connecting section (3); the length of the second adhesive layer (22) is not less than 2 mm; the second end of the first connecting section (3) at least partially protrudes from the second adhesive layer (22), and the protruding portion (32) of the second end of the first connecting section (3) is not greater than 2 mm.

6. The lithium battery tab that is easy to connect according to claim 5, characterized in that: The first connecting section (3) is an aluminum strip, the second connecting section (4) is a nickel strip, and the thickness of the second connecting section (4) is not greater than the thickness of the first connecting section (3).

7. The lithium battery tab that is easy to connect according to claim 1, characterized in that: One end of the second pole piece (5) extends outward to form a third extension portion (52), the third extension portion (52) at least partially protruding from the diaphragm (1), and the diameter of the end of the third extension portion (52) away from the second pole piece (5) is smaller than the diameter of the end close to the second pole piece (5).

8. The lithium battery tab that is easy to connect according to claim 7, characterized in that: Both ends of the second pole piece (5) are coated with a fourth adhesive layer (51), and the second pole piece (5) is bonded to a side of the diaphragm (1) away from the first pole piece (2) via the fourth adhesive layer (51).

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